Tuesday, November 10, 2015

home.comcast.net site is gone

offworldgirl.home.comcast.net and home.comcast.net/~offworldgirl are now DEAD.

This site was originally set up for the RSS blog feed into the static website hosted with Comcast's "Personal Web Pages."  As of 1 November 2015, however, Comcast has DELETED all the personal web pages sites and discontinued that website hosting service.

So I am gradually migrating the content worth keeping over to this blog site (and hopefully Google won't suddenly decide to shut down Blogger and force me to move it all somewhere again).

As for what is "worth keeping?"  Well, over the years I've received quite a few e-mails related to the Star Trek and Star Wars costume and prop content, as well as my in-universe Star Trek history articles about the Constellation Class starships and Section 31 (but those are going to take a while to bring over here).  Files that used to be hosted at the Comcast site are being moved to Google Drive.

Stay tuned...

Star Wars Cosplay: Jedi Costume

This drawing above was my original concept drawing for my Jedi costume. I had originally planned to do something funky with the tabards where they'd be one piece instead of two (as you can see below the obi/belt line). I wanted to put an accent like some tapestry embroidery or something in that panel below the belt. Then I wanted to mirror the "arrow" of the tabards with a point upward in the top of the belt, and use a large metal button in place of a buckle (since they actually buckle in the back). However, since I started working on the costume less than two weeks before I was planning to wear it I threw my concept notions out the window and just tried to do something simpler and more standard, as you can see from the photo on the right of what I actually ended up making.

Inner Tunic
Since the Inner Tunic is pretty well hidden under the Outer Tunic anyway, I figured I just needed a earth-tone top that suggested a "wrap" or "cross-over" of fabric. I found a Byers California brown stretch top that fit the bill perfectly for (if I recall correctly) something like $2 at Goodwill.

Outer Tunic
The Outer Tunic is made from an old bed sheet, folded in half. I laid it down on the living room floor and made an "angel" shape large enough to make the wrap tunic. I screwed up the sewing on the collar a bit, though, so there's a bit too much material there, but I wasn't going to attempt to fix it or I felt I'd probably just make it worse.

My Tabards and Obi are actually sewn to one another. I did that partly to keep things from shifting too much in the back when wearing the costume, but also because it makes it easer to dress in the costume without help. The tabards stop at the obi in the back, which is where they are sewn at an angle going up to the shoulders. the front of the tabards are loose. Obviously if you want the tabards to extend beyond the Obi in the back (like Qui Gon's did) you'll need to decide if you're going to attach them to the Obi in the back or if you're just going to have three separate pieces and let the Obi actually hold the Tabards in place. Some people also like to add buttons or velcro at the shoulders of the tunic and to the underside of the Tabards to keep them from slipping off the shoulders. I didn't need to do that because there was enough friction between the Tabard and Tunic material to keep them in place. The obi attaches to itself in the back with velcro. Like the Outer Tunic this piece was also made from an old bed sheet. Below is a photo of the Obi/Tabards I made and a diagram (click for larger) of how that was assembled.

I didn't make the pants. I found these at Goodwill for $4 and they were perfect for the costume.

My hooded Jedi Robe is made from blanket fleece. I'd read that the robes in the movies were made from blanket wool, which is expensive and scratchy so I wanted to make the robe out of something more comfortable. I got the blanket fleece on sale for about $2 yard. I bought 10 yards worth (an entire bolt - except mine was in four large pieces). These robes are frickin' HUGE and the hood is gigantic, the weight of which constantly wants to pull the robe off your shoulders. At the convention I had to ditch the robe during the room parties, partly because all that fabric swimming around me knocks things over and people step on it, but it was also VERY VERY warm.

(sorry I forgot to snap a pic)


I had a terrible time trying to find a pair of boots with less than 2 weeks to the convention. Frankly, had I not found any I'd have put the entire costume on hold until I did find a pair. I thought, since I was buying at the end of the winter season I'd find plenty on clearance. NO SUCH LUCK! I took time out from sewing to make three trips to various malls specifically in search of a pair of tall, brown, leather boots with flat (or low) heels and enough space to tuck the pants in around the top. On my third and final shopping trip, about to give up, I decided to walk out through Macy's. I normally would never have even considered Macy's since I simply can't afford to shop there. But literally on my way out I happened to walk by a clearance rack of nothing but boots at 75% off! Most were not my size, most were high-heel fashion boots - but tucked in behind some others was one pair with a low heel, the right color, with a neat buckle accent, and much to my surprise in my shoe size (a size I don't always see on the rack much less a clearance rack). I snapped them up for only $79 (retail price: $189). In case you're wondering they are Jessica Simpson "Brunella" boots. They were VERY comfortable for walking around all day and night at the convention, and I got several positive compliments on them.

Star Wars Cosplay: Jedi Utility Belt

I don't have any idea how to do leatherwork, and since I was starting on my Jedi costume less than 2 weeks before the convention I wasn't keen to try learning it. So I made my Jedi Utility Belt out of heavy, upholstery vinyl, which actually looks better in person than in these photos (enough so that more than one person asked me, first of all where I got my belt and secondly were surprised it was vinyl, and not leather). Both the wide belt and the narrow belt have card stock inside to stiffen them up so they are firm like leather would be. The card stock strip was simply strung through the vinyl tube, it isn't sewn in. I did that so I could replace the card stock as it wears out. The front buckle on the narrow belt is just for show, and the vertical loops either side of it are actually attached to the wide belt behind with upholstery thread (to keep the front from drooping).

Note: in the photo below the pouches hanging on the side are actually for a Russian field gun cleaning kit. I have yet to make my Jedi pouches, so the cleaning kit pouches (which are attached to each other) were borrowed just so I had something semi-appropriate hanging there. They will be replaced with a "Tall" pouch, a "small" pouch on the other side, and a "wide" pouch in the back.

Below you can see how I did the buckle at the back. The wide belt doesn't actually have a buckle, it slides through a loop and friction of vinyl-on-vinyl is what holds it in place until the narrow belt quick-connector is latched. Thus both belts can be adjusted for comfort (and future weight changes). The lower photo shows the back buckling undone.

I've encountered a problem with vinyl in the past regarding rivets where, as the vinyl stretches over time it gets loose around the rivets until they eventually tear out. I couldn't find rivets on short notice that would work anyway, so I decided to "fake" the belt rivets. I went to the hardware store an purchased ten aluminum "screw post assemblies" costing $0.49 each (eight longer ones and two short ones). I found eight washers in my kitchen junk drawer, then drilled out the holes so the screws would pass through, but the post couldn't. Below you can see close-up photos from both the front and back sides of these fake "guide rivets" for the narrow belt. I've also included a diagram to show you what these fake rivets are.

The two "rivets" either side of the buckle on the narrow belt are 1/4" Aluminum Screw Posts (below left) [Part # 86145] and the eight belt guide "rivets" are 1/2" Aluminum Screw Posts (below right) [Part # 86147] both made by Midwest Fastener and purchased as "Handi-Packs" at my local hardware store.

Lastly, a Jedi needs some way to hang the lightsaber from the Utility Belt. The two options are either to use a Covertec pager clip or a D-ring and hanger. The hangers used in the movies were just a single "picture hook," which doesn't look very nice. Since my lightsaber actually has some heft to it I wanted a sturdy hanger - something that wouldn't concentrate too much weight in one place on the belt, but spread the load a bit, and also something that would secure the lightsaber without my having to worry about it falling off when walking around at a convention. Below is the strip of aluminum I made into my D-ring hanger.

Star Wars Cosplay: Lightsaber Prop

Since I wasn't planning to do a specific character from the movies I had a lot more freedom in the design of my lightsaber prop, and hey. . .Jedi are SUPPOSED to build their own lightsaber from scrounged parts, right? Well, that's exactly what I did. I went down in my basement and found pretty much everything I needed to build the lightsaber you see pictured above.

Here are the parts I used to build the lightsaber:
A. Thumb-tighten set screw knob, I think it came off of a broken camera tripod but I'm not sure. I found it in a box of junk.
B. Chrome plastic knob off of a broken desk lamp (obstructed in view)
C. Hardened steel chrome pipe from a grab-bar (like used in bathrooms for disabled people).
D. Green LED bar graph left over from an electronics kit.
E. Metal shroud from around a connector inside a dead iMac G3
F. Faucet aerator
G. Chrome plastic Revlon lipstick tube
H. Extension tube from a broken vacuum cleaner
I. Scrap PVC plumbing pipe (cut and carved to shape with a Dremel moto-tool)
J. Flexible hose from the aforementioned broken vacuum cleaner
K. Sink drain basket (there are 2 of them, one is inside the PVC pipe)
L. "D-Ring" strap is a bent and drilled scrap of metal. I actually had to buy the D-ring though. It was the ONLY thing I bought.

As you can see above I also scavenged some screws and a microswitch from a broken DVD player. The metal shield not only protects the LED bar from damage, it actually is what's holding it onto the lightsaber hilt. The funky hex bolts were discards from a manufacturing company and cost me nothing.

The "Emitter" end has an orange LED taken from an old ATX computer tower (it was the hard-drive activity light). There was also a green "power" LED, but the bar graph on top is green so I decided the emitter should be orange. There is a reflector behind the LED taken from a broken flashlight which was a promotional give-away item.

Changing the batteries can be a bit of a chore. The four hex bolts need to be loosened, and the two knobs near the emitter removed. Then the metal tube has to slide out until you can get at the 3-wire connector and disconnect it. Only then can the battery holder (a tube out of a toy telescope) be pulled out the front. The "Emitter Assembly" is shown disconnected here, though technically it doesn't have to be. The wiring and connectors came out of the aforementioned dead iMac G3. The positive and negative contacts for the battery holder were taken from the aforementioned broken flashlight. Below you can see a nice schematic of the wiring of my glorified flashlight:

Jedi Costume
Utility Belt

Jedi Pouches

Star Wars Cosplay: Jedi Pouches

The Jedi Pouches seen in the prequels aren't really pouches at all. They were cast resin props painted to look like hand-tooled leather. There are numerous sources online offering DIY kits for those pouches, both as solid blocks or modified so you can actually put small items inside them. I wanted functional pouches, and since one of my goals was to make the costume on the cheap (and quickly) I didn't have time or money for replica prop pouches. There ARE actually a couple leather pouches seen on Jedi belts, and at least one source online I know of that sells leather reproductions of them.

I had purchased far more vinyl than I thought I actually needed for my Jedi Utility Belt - just in case I made a mistake I wanted enough extra fabric to start over. Since the belt (mostly) went as planned I have more than enough vinyl to make some pouches too. However, trying to find a pattern online for pouches was a problem. I found a couple different patterns for the "Ammo Pouches" on Boba Fett's bandoliers, figuring maybe I could just modify them, but I wasn't happy with the way that looked. Then I found a PDF file tutorial on making leather utility belt pouches - which only references patterns in a book, but doesn't provide them. I also wasn't quite sure how big they were supposed to be, but I did know they were different sizes. Using the sizes listed on the aforementioned web site selling reproductions I got to work drafting my own patterns.

Unfortunately that was as much as I got done before the convention. I didn't have time to actually MAKE the darned things, and ended up borrowing a Russian-surplus pouch for a field gun cleaning kit from my brother just so I could have something pouchy on my belt. Now that the convention is over I plan to get the pouches done at my leisure - and hopefully before I need them for the NEXT convention!

UPDATE: after the convention I did actually make a full set of these pouches, but they looked wrong being the same color and grain as the utility belt.  So I tried to make them look like a richer leather and a bit distressed by spray painting them with a sort of reddish brown and wiping them while it was still wet.  The effect was pretty good - the problem was the paint NEVER seemed to dry.  The pouches remained sticky to the touch.  I reluctantly had to throw them out and now don't have enough of the vinyl left to make another set.  So, for now, I'll be sticking with the surplus pouches.


Here is a PDF file of the patterns I drafted for the pouches. Just print it, cut out the pieces, trace them onto the back-side of your vinyl with a pencil and you'll have what you need. If you can swing it, these should probably be made of slightly darker color than the Utility Belt (or painted with vinyl paint). I'd also recommend faux aging them by roughing them up with sandpaper and/or a file and I've had some luck with brushing India Ink on the bottom edges and wiping it - it makes that dull, dark "leather that got wet" look.

Jedi Costume
Utility Belt
Lightsaber Prop

Star Trek Cosplay: Assault Phaser Prop

When it came to the question of what model phaser we'd be carrying on our hips, well it HAD to be the only cool phaser design Star Trek ever had (in my opinion). That would be the "Assault Phaser" that was based on a Beretta handgun. The image below, as near as I can figure, is a photo of an actual, screen-used, "Hero" prop from the Star Trek VI.

This was another item I wasn't sure I'd find THREE of before the convention, so my "Plan B" was to make a wooden replica and then use that as a master from which to resin cast more, because there was no way I had enough time to scratch build three of them! It took me about a month of evenings to fabricate just one (but I admit, I'm not exactly a master woodworker). Keep in mind, too, as you look at the photos that when I built the wooden prop replica I didn't have ANY three-dimensional reference for making it. All I had were photos of the the screen-used props and numerous photos of other people's prop replicas, but I didn't actually have one in front of me from which I could work.

I kept an eye out on eBay, though, hoping I'd stumble across someone selling some of the toy Assault Phasers made by Playmates. But they often went for $70 or more and I didn't have a lot of money to play with. Ultimately I DID win a couple for about $40 each, so we didn't have to do resin casts of my wood prop replica. So, I ended up painting it and wearing it to the convention. The photos below show my wood prop replica as compared to the Playmates toy phasers.

View showing the magazine plaques on the bottom (my wooden prop in the foreground, modified Playmates toy in the background)

Right Side of my Assault Phaser prop (top) and the Playmates toy (bottom)

Left sides of my Assault Phaser prop (top) and the Playmates toy (bottom)

Detail image of the right side of my wooden prop replica

Detail image of the left side of my wooden prop replica

closeup of phaser holster.  Here is the holster pattern if you want to make one yourself (make one out of scrap material and test it first, fit is slightly different depending on the prop - you don't want it too loose!).  It can be used without the Starfleet badge, but if you want one like mine make sure you buy the smaller version, not the larger one worn on the "Monster Maroon" jacket.

Since I DO actually have one of the plastic toy versions of this Phaser I also have the cool blueprint that came with it.  But I wondered what kind of documentation would Star Fleet personnel get?  So just for fun I created a Type II - Model VII Combat Phaser Star Fleet Handbook using the illustrations I made as patterns for the wood replica.

Nexus Vest

Star Trek Cosplay: Communicator Props

I didn't care much for the communicators used in the Star Trek movies prior to "Star Trek V." The one from "Star Trek III" was okay, as it was again similar to the one from the original series, but I knew there actually had been toy walkie-talkies made for the fifth movie - and how cool would that be? Problem is they weren't SOLD, they were a "premium" item you could get through a mail-away offer. Which, of course, is why it's so hard to find them, and when you do they're often broken or super expensive.

Above are what, to the best of my research knowledge, are photos of actual screen-used communicator props from "Star Trek V."
Anticipating the distinct possibility I'd never get my hands on a set of those walkie talkies (and the fact there were three of us doing the costumes, so I'd realistically need TWO sets - or at least one complete set and a partial set), I had a "Plan B" to fabricate communicator prop replicas out of wood. My initial notion was to make it so I could hide my mobile phone inside of it, but that didn't work out, so then I just decided to try and make a replica. This ended up being a LOT harder than I'd thought it would be, but the plan was to make one out of wood and make more from resin casts of it. My biggest headache was trying to figure out how to make the cover. I initially DID try to make it out of metal, but it wound up so weakened by all the slots cut in it that it broke almost immediately. I eventually ended up making one out of masonite with grooves carved in it with a Dremel moto-tool. You can see the results of that below.
Thankfully, as we were getting down to the wire (I think it was within a week or so of the convention), I won an auction on eBay for TWO complete sets of the "Star Trek V" walkie-talkies, in their original packaging, fully functional, and apparently never used! I sold the one set to my friends and kept one set for myself, and wow did those get attention from con-goers. :-) Anyway, below you can see my comparison photos between my attempt at a wooden prop replica and the toy walkie-talkies.

Comparison between the Star Trek V walkie-talkie communicator and my wooden prop replica (which I didn't end up using because I had the walkie-talkie)

Star Trek V walkie-talkie communicator and my wooden prop replica with the covers open.

3/4 side view of the walkie-talkie communicator and my wooden prop replica.

Closeup of communicator holster I designed for it. There is an elastic strap across the front to make the holster "hug" the communicator because I was really afraid these were going to fall out and crash on a hard floor into a zillion pieces. Actually you had to kind of "work" them out of the holsters. The only real purpose of the notch in the front of it, though, was just so the holster didn't cover up so much of the communicator. I wanted people to be able to SEE it!

Nexus Vest
Assault Phaser

Star Trek Cosplay: Nexus Vest

Note: This post originally appeared on my Comcast Personal Web Page, but they've discontinued and deleted all of those sites so I'm moving most of the content here.

The "Nexus" vest was only ever seen on Kirk when he was in the Nexus during "Star Trek Generations." It was not seen with the belt worn over it, nor were rank pins or pips & squeaks worn on it. Some liberties were taken there so the pins and belt could be used and so there would be somewhere to put the field gear. I had originally intended to make a tricorder that was actually a purse but didn't have time so I just made an actual purse "Starfleet Field Gear" by putting the emblem on it. It was large enough to double as my camera bag.

Above is a photo of the completed Nexus Vest, Tunic, and Belt with empty phaser and communicator holsters.

Detailed image of the Starfleet Badge, Pips & Squeaks. The badge was just plated so it was painted the correct colors from the movies. Pips & Squeaks were silver (Enlisted) and were painted gold (Commissioned) and one of the "five year" round pins was changed to a "ten year" by using the Dremel Rotary Tool to carve a Starfleet Delta in the surface.

My "Starfleet Equipment Bag" - it was a cheap "messenger bag" style purse from Target and I hand-painted the Starfleet Command insignia on it.

Finished belt with my phaser and communicator holsters. I'm well aware that in the movies they didn't have holsters, but I didn't want to attach things to the belt with Velcro, so I designed and sewed the holsters shown here. The badge on the side of the phaser holster is a small badge from Roddenberry.com that not only dresses it up, but doubles as a way to keep the holster strap in place (which is what holds the phaser in the holster).

The communicator prop has a thin, black elastic band sewn in at the top of the notch to help it "hug" the communicator. Initially the purpose of the notch was simply to not cover up so much of the communicator because I wanted to show it off. Both holsters are made out of a heavy upholstery-grade leather-grain vinyl that was flocked on the back. The belt was made out of a much thinner vinyl with a "waistband" stiffener material used to help it keep its shape. The buckle was purchased from Roddenberry.com and is fully functional, not just for looks.

UPDATE 4 Oct 2017: Here is my best attempt at making a Pattern for the Phaser Holster (PDF).  I didn't actually use a pattern so this document is based on measurements taken from one of the four holsters I made.  The material I used was scrap vinyl for a motorcycle seat, which had a felt-like backing.

If you want the same Starfleet Badge pin as the holster clasp Roddenberry is no longer selling them, but I believe THIS ONE from Intergalactic Trading Company is very similar.  You can probably find it other places online as well, the main thing to know is that it's smaller than the badge for the "Monster Maroon" uniform.

 Assault Phaser

Saturday, November 7, 2015

Star Trek: Tricorders

This is part of my research on Star Trek Tricorders, toward the ultimate end of building a prop replica with lights and sound.  First, however, I wanted to figure out if there is actually any rhyme or reason to the model numbers for Tricorders - and just how many specialized variants ARE there?  What you'll find below represents my best research and guesses as to what Tricorders existed at different "in universe" dates and what their possible (or known) model designations are.

Scanners (Pre-Tricorders)

2150's Earth Starfleet

Hand Scanner
Heavy Duty Scanner

MACO Scanner

Medical Scanner (not shown) is basically a handheld scanner programmed for medical usage. Dr. Flox may have referred to it as a "Tricorder" in one Season 3 episode, if the off-screen device to which he was referring was his Medical Scanner. Perhaps Medical Tricorders were already in common usage on Denebulia and he just mis-spoke, or the terms "scanner" and "tricorder" were interchangeable during that era.

2150's Earth Sciences Institute

Standard Scanner

Medical Scanner

These were not in use by Starfleet personnel, but were used by memebers of the Earth Sciences Institute. It is unknown if there was a "heavy duty" variant.

2150's Vulcan High Command

Standard Scanner

Medical Scanner

One can assume that the Vulcan scanners were probably better than those in use by Humans given that Vulcan technology was generally more advanced.

2160's - 2250's

Sometime during the period of the 2160's to 2250's Scanners fell out of use in favor of Tricorders. During the Pilot episode "The Cage" the landing party does not appear to use either type of device, though one crewman can be seen with a large backpack with antennas on it and another with two different box-like cases on shoulder straps, one of which is covered in black vinyl and may be an early, bulky, Tricorder.

Tricorders (TOS & Original Cast Movies)

For the Original Series and the original cast movies we aren't given model designations for the Tricorders. However, if you backtrack from the model numbers used in "The Next Generation" it's possible to make a best guess as to what the logical model numbers are for early Tricorders. That is, of course, assuming that Starfleet Research & Development's naming conventions remained consistent between the TOS and later eras. For the purposes of compiling this list I am assuming those naming conventions are:

1. Model Number (TR-XXX)

2. Development Version (Mark X)

3. Standard or Heavy Duty (Type 1 or 2 ; Type A or B)

Starfleet R&D also appears to introduce updates on approximately a ten year development cycle, with either a new model or new development version of an existing model.

Given the uses we see for the "heavy duty" type in TOS it's obviously more ruggedly constructed and heavily shielded against external interference. But there's no reason to think the internal components are drastically different from a standard Tricorder, so I am going to assume that "Type 1" is a standard tricorder and "Type 2" is the heavy duty version. Also, for the purposes of my list I am going to arbitrarily assume that Starfleet switched from numeric "Type" designations to alphabetical ones.

2260's TR-460 MARK I Type 1 & Type 2



Heavy Duty

Geology Variant 
TOS "That Which Survives"

PsychoTricorder Variant
TOS "Wolf in the Fold"

The Starfleet Technical Manual lists both the "science" and "medical" versions as being a Tricorder Type 1. So obviously it didn't matter what specific use for which the Tricorder was configured, meaning the "geology" and "psycho" variants are ALSO of Type 1.

Note: The Heavy Duty Tricorder prop was a modificed Nuclear-Chicago Model 2586 "Cutie Pie" radiation detector.

2270's - 2280s TR-470 MARK II Type 1 & Type 2


This is never actually given a model designation, but if one assumes the TOS Tricorder was the Mark I, then this may be the "Mark II Type 1."

A "medical" variant isn't shown, but can be assumed to have existed, which would have also been of Type 1.

A "Heavy Duty" version isn't shown either, but can also be assumed to have existed, and given the massive amount of redesign to all Starfleet equipment during the era of "The Motion Picture" it is doubtful that the TOS-era one remained in use. Given that "heavy duty" versions don't look like the standard ones, it must be "Type 2."

2280's TR-480 MARK III Type 1 & Type 2

Star Trek III

Star Trek VI

Heavy Duty 
Star Trek II

I'm going to assume that since uniforms and other equipment underwent a redesign in the 2280's, the Heavy Duty Tricorder seen in Star Trek II would not be the same model as one in use during The Motion Picture era, and would keep pace with whatever updates were made to the standard format Tricorders.

I have seen prop replicas of the ST3 Tricorder with a "Mark IV" label, which may also be acceptable, as I note in the next section.

2290's, 2300's, 2310's, 2320's, 2330's, 2340's, 2350's MARK IV & MARK V

If the first folding Tricorders weren't introduced until The Next Generation era the Mark IV and Mark V may have been based on the 2280's design, or may have been completely new designs we never got to see. However, given that some people have assigned "Mark IV" to the ST3 Tricorder I'm going to say that at least THAT one was of the same design, and we can only guess as to what the Mark V may have looked like.

I'm assuming models TR-550, 540, 530, 520, 510, 500, and 490 were all released during this time period.

Tricorders (TNG/DS9/VOY & New Cast Movies)

2360's TR-560 Mark VI & TR-580 Mark VII

TR-560 Mark VI Type A

Science & Medical
TR-580 Mark VII Type A

Red Medical Tricorder
TR-580 Mark VIII Type A

TR-560 Standard Tricorder Mark VI
TR-580 Standard Tricorder Mark VII
TR-580 Medical Tricorder Mark VII
TR-580 Medical Tricorder Mark VIII (assumed) was a RED Tricorder mounted at each Biobed in Sickbay aboard Voyager, and is therefore assumed to be a Medical variant, probably used in conjunction with the Biobeds for emergency diagnostics. It was replaced in later seasons by a PADD.

Note: There must also have been a TR-570 during this time, probably very similar to the 560 and 580. It's also possible it the model wasn't released, and the 580 was instead. There must have been either significant advances or problems with Tricorders during the 2360's for Starfleet R&D to burn through three model numbers in one decade.

2370's TR-590 MARK IX & MARK X 

TR-590 Mark IX Type A

TR-590 Mark IX or X Type B 
Wrist Tricorder

TR-590 Mark X Type A

TR-590 Science Tricorder Mark IX Type A (type assumed) [2nd Season VOYAGER]

TR-590 Medical Tricorder Mark IX Type A (assumed to have existed, type assumed as well)

Wrist Tricorder might be a TR-590 Mark IX or X of Type B (assumed) [Star Trek: Insurrection]

TR-590 Standard Tricorder Mark X Type A (type assumed)

TR-590 Medical Tricorder Mark X Type A (type is assumed)

2380's TR-600 Mark XI Type A

TR-600 Mark XI Type A

TR-600 Mark XI Type A

TR-600 Mark XI Type A

The Tricorder Mark XI is only seen in Star Trek: Nemesis. It has a large touch screen interface, only a small door closes at top. The model number TR-600 is an extrapolation from previous models, which appear to increment in tens.

Standard (a.k.a. Science)

2400's TR-620 Mark XII 

TR-620 Mark XII Type A [VOYAGER: Endgame]

Standard (is like the Mark X with more touch surfaces)
Medical (has a small antenna scanner)

Note: The model number is extrapolated from prior models. If new models are slated for release on a ten year development cycle, and the 590's were introduced in the 2370's, then by the 2400's they should be up to about model 620.

2410's to 2790's

We have no idea what Tricorders were like during this very long time period, though the folding design seems to be be in use in the 29th Century. However, it may have simply come back into style. Model numbers appear to continue onward encompassing models TR-630 to TR-880.

2800's TR-890 Tricorder Mark XV Type A


TR-890 Mark XV Science [VOYAGER: Relativity] Type A (assumed)
TR-890 Mark XV Type A Medical (assumed to exist)
TR-890 Mark XV Type B Heavy Duty (assumed to exist)