Tempscribe winding thermometer Review / HowTo
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- Опубліковано 4 жов 2024
- The Tempscribe chart recorder from the 1960s by the Bacharach company. It's a wind-up thermometer that makes a graph of the temperature over time.
This is episode 77 of my video series about old calculating devices.
A loose sequel to my video about the radial planimeter: • 1920s Radial Planimete...
My page about the Tempscribe, with paper chart downloads: faculty.fairfi...
End song inspired by "Hotter than a Molotov" by The Coup. • The Coup: Hotter Than ...
Absurd snake can lady stolen from: • SNAKE Pringles Prank o...
ECG footage from: • iMAC 300, 3-CH ECG Mac...
Old timey radio is the Crosley CR31D-WA Companion Retro AM/FM Tabletop Radio with Bluetooth Receiver, Walnut (amazon photo)
Old timey clock is the Presentime & Co. Vintage Farmhouse Mantel Clock Series, Napoleon Desk & Shelf Clock, 13 x 10 inch, Domed Lens, Quartz Movement, Walnut Brown Finish (amazon photo)
Tachograph photo by Wikimedia user Paettchen, CC-BY_SA 3.0, commons.wikime...
Chris Staecker webarea: faculty.fairfi...
It’s pretty discouraging that a great deal of people still seem to believe that the polygraph is a valid test
i dunno sounds like you might be hiding something...
The needle may be for scraping "blacked" paper. Blacked paper has a fragile layer of soot deposited on it from a parafin lamp.
Good idea, if you use a disc of plate glass (with the gradations etched on the back side) you can even re-soot it yourself and use it over and over. The lower friction between the stylus and the glass should also mean more accurate measurements than dragging a pen over paper. You wouldn't get an archivable paper copy but some use cases might not need one.
Ohhh. Carbon paper. Carbon. Burned something. Soot. I never realize that until this very moment. Thank you. However, you could probably just put black permanent marker over the glass, and the needle would scrape it. Clean off the marker with alcohol.
@@TaramiBedona -- i'm pretty sure the blacked glass came first. Edouard-Leon Scott de Martinville did it for sound recording.
@@TaramiBedona Couldn't you just take a sheet of paper, deposit some adhesive on it and then transfer the remaining soot onto the paper for archiving?
It's not a needle, it's a tube, and it is a pen of some form or another, I'm trying desperately to figure out how to use it
Superb cutaway to the little "No Image Available 🤓"
These are not only still used, but even preferred in certain situations! With computer data aquisition of analog data, the samples are often time based, say 1 sample every minute. If you get a wild swing within that period, you wont see it in detail, or even at all. With these, you'll always see the spike, almost no matter how fast it happens!
We still use them in pharmaceutical packaging applications where there needs to be a constant record of temperature, they also use a similar thing to record humidity. All calibrated of course. The paper record then goes into the file of the batch of the medication and is kept on file for the life of the product.
We still use temp scribes at my work for the weld wire ovens, quality changes the paper and keeps the used one for our records
Do you make your own blank charts? Official ones are expensive.
@@ChrisStaecker Sorry for the wait on the answer here. They buy them directly from the people who make the machines. Yes they are expensive, but when your mark up is literally hundreds of dollars a dose, they can afford it.
Very cool. I just passed our freezer at work that we keep and -78 Celsius to hold human tissue grafts. We use that same graph. It hasn’t wavered from -78 all month.
Maybe you should check to see if it isn't broken?
For the overwound spring: I'd recommend, see if there's a clockmaker, or clock repair shop, in your area. These people might have experience and tools to deal with it safely.
OH MY LORD HERE COMES THE RADIAL PLANIMETER WITH A FOLDING CHAIR
Thank you for making this video. I just found my grandfather’s tempscribe and I wanted to learn more about it. This was perfect!
OMG! I bought a Baroscribe, barometer, a few weeks ago and it's super neat. Now I've been looking at the Tempscribes 😂
For the average, cut the paper out along the line, weigh the paper!
this is not quite the average; it biases toward outside values because there's more paper per angle out there. If for instance we have a curve that spends half the rotation at radius 1 and half the rotation at radius 2, the resulting "average" comes out to 1.58 as opposed to the 1.5 that it should be. Prof. Staecker talks about that in the video about the radial planimeter: ua-cam.com/video/jmtYW1lDP8M/v-deo.htmlsi=iPOTm_edYQMHGtOI&t=332
@@unspeakablevorn But that's not a problem. You weigh it, look the weight up in a table that presents the inverse function.
Any idiot can cut the shape out, and wiegh the paper, which makes it an interesting method.
I was discussing this the other day withsomeone making river tables with epoxy. Look them up. How much epoxy do you need to mix?
Well my view, weigh the wood. Get its moisture content. Now calculate the volume using the standard density for that wood, and adjust for the extra or less moisture. You now get the volume. Compared to a descrete measurement of gap, a rough integration, the weight is known to a high degree of accuracy. Even a 25% moisture level compared to a standard 20%, leads to a 5% change in value, and the error is in volume is going to be small.
Now you can calculate the mold size, take off the wood volume, a bit extra for safety and the jobs a good 'un.
@@Nickle314So, logically, if the cut out paper weighs the same as a duck, it’s made of wood. And therefore… a witch!
Does it quack? :-)@@MrEMeat-kk9tc
i don't think there's anything that feels quite as magical to me as bimetallic strips, or in this case, the bimetallic spring. you can turn the the expansion and contraction from one metal changing temperature into a rotational motion by having 2 different metals (which expand and contract at different rates) attached to each other so that the ones that expands more can "stretch over" (kinda) the other, tilting the whole assembly. this is how a whole bunch of old thermostats, garden thermometers, and toasters worked. it's the most effective way to detect temperature without electronics, apparently.
If you aren't familiar with the channel Technology Connections you need to be. I think you'll get a kick out of it.
Yes- he’s great
Welcome to the best corner of UA-cam
videos like this one reignite my love for the internet
love it! I’ve worked in museums long enough to have gotten to use battery-powered drum and radial hygrothermographs, plus the even cooler psychrometers to calibrate. We normally used psychrometers with an electric fan, but still had a few old school sling psychometers that were extra fun to swing around. Then the digital dataloggers came along and ruined all the fun.
They are also used in archive rooms as a physical audit of the temperature control
I guess any clockmaker oak watchmaker would help you with that 7day mechanism. It would be nice to see it's going and not having dangerous spring waiting for a right moment.
Ive got one of these! i have the 24hour version with both the remote sensor door and the internal sensor door (so you don't need the long copper probe)
the original needle pen is the best as it draws a nice sharp thin line. the ink bottle that comes with it should have a fine needle attached to the glass stem, its used to clean the hollow needle pen. I just use Ink used for fountain pens and it works well
I thought of an idea for dewinding the spring. Put it in a vice and gradually open the vice.
You'd have to somehow get the vice and gears on at the same time which may be hard with other parts in the way.
When you mentioned the 7-day clock, I remembered a store in appearently North Grafton MA which is I thought near where you lived.
When you do all the calculating machines you could turn to clocks.
There's a clock shop near me that I'm sure could've fixed it- but it was cheaper to just buy a new one!
There are various tutorials on youtube for unwinding something like this, but I didn't want to risk it.
You can canibalize the "nice clear dome" from the one Tempscribe to complete the other.
Yeah I considered it- it doesn't seem to come off easily though. Maybe it's glued?
In Clarkson's voice: 'ery noice!
Love It 🥰 - the physical media of data collection.
🤔 a thought occurred to me while you were demonstrating … What if the chart paper was a continuous spiral? It would be made of standard discs that are spliced into each other at the zero point to form a flat corkscrew of time. The design would have to be reengineered to make this work, but what do you think? 😂
Thanks for Sharing.
Yeah- like the shape at Wikipedia "Principal branch". I think it could work!
I have something like that! It's a drum, not a disk, and in addition to temperature it also features a horse hair humidistat
What software do you use to create those nice chart replacement disks?
I’m also interested in this. I’ve played with software for slide rule rendering, and they’re often fairly hardcoded to legacy scales, and not so easy to extend. (I want to make modern custom slide rules.) I’m hoping to see some better software packages for this kind of thing.
Latex with tikz. Click the link in the description to see the code! (I do it this way because I use tikz all the time in my research- it's what I'm familiar with, but there's probably better ways to do it.)
@@ChrisStaeckerHow did you know how “curvaceous” the arcs should be? 6:54
Well isn't that interesting: I refurbish clocks and watches --and-- own a tempscribe! Anything I can do to help you get your not-working one working again let me know!
Nice! Was I wise not to attempt to unwind it myself?
@@ChrisStaeckervery much: the right way is to support the barrel (which includes the spring) from unwinding, carefully disengage the clickspring, and then carefully let it release its energy very slowly. Even contained, if you let it unwind completely free it's likely to damage itself because it will happen with a lot of force.
But then the next steps are to figure out why it's in that situation: usually means the rest of the mechanism (especially the escapement) is gummed up or possibly damaged. I bet every time someone poked at it they inevitably wound the spring with no way for it to unwind, and now it's fully locked up and putting undue pressure on the spring's bridle.
Needs to be unwound, then taken apart to examine all the pivots to make sure they aren't bent or broken, then reassembles with the right oils and greases
Does the binder clip on the arm distort the measurement? If so, would re-calibrating fix that? 4:07
I think that it does- it makes the head heavier than usual, which will probably dampen the spring action overall- I'm not sure if the calibration would be able to counteract that. I also don't know how long the original marker is, so my pen is likely not hitting the paper at the correct "height"- this also probably cannot be fixed with the calibration screw. But overall the temperatures I'm reading are reasonable, and given the thickness of the line I'm drawing it's fairly imprecise even in the best case.
My wife says she saw these installed at the bio lab she worked at.
It’s weird I can’t get to your links. Are they still valid?
Sorry I had to move my webpages this summer and I haven't updated them all. I just updated this one!
@@ChrisStaecker thanks
Put a zip tie around the spring and go to town.
Damn youtube, it shows garbage but not what I subscribed to!
which one is this
5:58 That’s impossible. Nobody has ever figured out how to do that. You should give up right now.
Just add them all up! How hard could it be?
@@ChrisStaecker Someone needs to invent an ink that changes color every 24 hours after it hits the paper.
When I started working Avionics in the USAF one of these plus a humidity unit of the same design was required at each maintenance shop. AC was critical for many systems when opened. Great in the states. When I got to DaNang we had them but the shop was in a hanger and there was no AC so the unit did not have a page change for the full year I was there.