| General > General Technical Chat |
| electronics like its 1922 |
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| bsfeechannel:
You can bet your bottom dollar that insulators for alligator clips were available way back when, since they were intended right from the start to be used with test leads. But then it is not the alligator clip or it having an insulation that was anachronistic. Perhaps it was the "thin PVC". In that case, the video is full of anachronisms: the modern vacuum pump, the modern gas torch, the battery operated drill, the HD digital camera he used to film it, to name a few. |
| TimFox:
I had some quite old crocodile clips on the test leads for a pre-war Simpson 260 meter. The rubber insulation used on the clips and the wires had hardened with age and cracked off. |
| james_s:
That's pretty impressive. Functional vacuum tubes without the use of a diffusion or turbo pump and not even a getter, I wouldn't have thought they would work at all, much less well enough to be sealed off. |
| TimFox:
Lee de Forest believed that a hard vacuum would not work in a tube: he thought that some gas was required for electron flow. |
| coppice:
--- Quote from: TimFox on October 28, 2022, 10:57:54 pm ---I had some quite old crocodile clips on the test leads for a pre-war Simpson 260 meter. The rubber insulation used on the clips and the wires had hardened with age and cracked off. --- End quote --- While big chunky crocodile clips used to have a rubber covering, most clips used two chunks of something rigid, like bakelite, on the two sides of the clip. |
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