As some of my preceding paintings at Hackaday will attest to, I’m a large fan of the World War II generation. Something around going in with wooden airplanes and leaving with jet combatants and area-capable rockets has usually captivated me. So while one in all my lovingly crafted eBay alerts changed precipitated by using something claiming to be a “Navy WWII Range Computer”, it’s safe to mention I changed into interest.
That is not to say I had no concept of what the component became; I only knew it looked vintage, and I had to have it. While I eagerly awaited the tool to reach my doorstep, I attempted to research it and got here up pretty empty-surpassed. As you may think, a whole lot of the technical facts for hardware that changed into developed in the 1940s haven’t pretty made it to the Internet. Somebody is selling a technical guide that might have blanketed this device’s feature for $ hundred on another site, but I think that is probably an immoderate chunk. Besides, where’s a laugh in that?
I decided to attempt to decipher what this device does through a careful exam of the hardware, consultation of what little technical records I could pull up on its components, and some modern gear. In the end, I suppose I actually have an awesome idea of how it works, but I’d like to pay attention to if there are all of us available who might have actually labored with hardware like this and could fill in any blanks.
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OVERVIEW
The first thing I was with was turnedwasarge and heavy this aspect is. Compared to modern hardware, the CP-142 is constructed like a literal tank. It’s built of thick folded sheet metal with a captivating crinkle coating of a few kinds that simply screams “Old School Military”. It’s roughly the scale and form of a toolbox, with a gap on the bottom that makes me assume it was, meant to straddle some different piece of hardware at the start. Controls are minimal: an energy switch, an “Intensity” dial on the left, and a window to view a mechanical readout on the right that reads “Miles”.
On the side of the tool, there’s a 70mm graduated dial that actions the counter when it’s turned around. It’s clear that rotating the dial is supposed to set a selected distance, but more on that later. After loosening two thumbscrews on the lowest, the CP-142 may be opened on a hinge to view the internal components. Two truly categorized first-rate adjustment knobs close to the number one manipulate seem to indicate that starting up the hardware to fiddle with the internals was not unusual. There’s even a little hex key stressed to the body of the tool, which can be used to loosen or dispose of the control dial, possibly so the operator may want to align the marked graduations with the pointer on the front of the case.
ELECTRONICS SECTION
The left-hand aspect of the CP-142 is dedicated to electronics, which consists of 4 12UA7 tubes, a 6AK5, a 6AL5, and a Raytheon UX-7350 transformer. There’s no PCB in this tool; all the wiring is executed factor to a point, with a few tough metallic “rails”.
WIRING
A thick package of wires comes out of the electronics phase into a bus bar placed right below the lid hinge. A transfer here also cuts electricity to the device when the lid is opened. Clearly, the device would be opened sufficiently that a safety interlock and methods to save you twine fatigue from repeated commencing and remaining become deemed necessary.
The wire bundle is wrapped up with loops of black thread every 10mm or so, achieved via hand. It’s first-rate to feel the connection to the producing staff of the time. In all likelihood, a woman who was a part of the exertions force who stepped as much as help the battle effort turned into tasked with tying those little thread loops round bundles of wires for 8 hours a day along the one’s employees routing the cables and doing the point-to-factor soldering.
Above the bus bar, the wiring goes to the power switch, depth dial, and a bulb that lights the mechanical show. The construction of the transfer is something I’ve by no means visible earlier than, as in place of having a Bakelite body as you’d normally anticipate from the technology (and that’s present in different areas of the CP-142), it’s fabricated from sandwiched pieces of some fiberboard.
