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1920s Battery Charger [Restoration] (Patreon)

Published:
2020-02-05 01:46:14
Edited:
2020-07-02 04:31:51
Imported:
2026-06

Content

I know one of you can explain exactly how this thing works.  I MUST KNOW!

Files

1920s Rare Battery Charger [Restoration]

In this tool restoration I focus on a 900-Sterling Rectifier made by The Sterling MFG. Co. of Cleveland, Ohio. The rectifier was most likely used as a battery charger for radios and cars in the 1920s. From my research, I do no think this exact model is a common tool as the pricing suggests it was around 5% the cost of a Model T in 1922. I believe this is a vibratory reed half-wave rectifier, but I am not 100% sure. This technology was used before vacuum tube diodes became popular. The actually restoration was much more involved than I thought it would be and I was concerned that I would not be able to get this to work once back together. Electrical wiring is not my area of expertise, but a bunch of research helped. I was not able to find an exact patent, but this one was close: https://patents.google.com/patent/US1179515 I chose to replacing the nickel-plating on some of the brass parts, but not all. I had to remake some bakelite pieces, but was able to revive others in plastic restorer cream. I also chose not to do a clear coat on this tool as the original paint seemed to not be that glossy originally. I would have also liked to rewire the main coil, but I just do not feel comfortable yet tackling that. I really do want to have a try at rewinding an electric motor, but I don't want to practice on something so uncommon. I was VERY surprised that this worked after I wired it back together. It took me about 5 hours of wiring to make sure this was put back together in the exact right way. Hopefully I can pass this along to someone that can exactly explain how it works! These are advertisements from 1922: https://imgur.com/a/7L0uZb6 28:39 Nickel-plating solution Checking continuity: https://youtu.be/eUzKAxZ9pJ8 I would like to thank Evapo-Rust for sponsoring this video. Wrenches are now for sale at www.handtoolrescue.com Help secure more tools for future videos (if you want): https://www.patreon.com/handtoolrescue Instagram: https://www.instagram.com/handtoolrescue Facebook Group - Share your restorations https://www.facebook.com/groups/handtoolrescue https://www.facebook.com/handtoolrescue/ Reddit - Share your restorations https://www.reddit.com/r/HandToolRescue/

Comments

Planky

I ❤ you HTR

Stuart Young

I think I know of someone who might be able to explain how it works for you. Only issue is he's a bit shocking to work with (though usually, he's the one being shocked). Upside is, he's also in Canada, so shipping it to him will be cheap. :P

Andrew Billi

Its like the Fisher Price Walkie Talkie I had ask a kid! Great video. Sound is a little rough. Maybe I need to up my donation so you can get a new mike. ;D

Enigma 4you

It’s an auto transformer with a good old fashioned selenium half wave rectifier. The knob adjust a bimetal that acts as a over current protection. It is not pole specific so it can be attached to the battery in any way. It’s not a true rectifier but more of a pulsed ac.

Jacob Freet

So I realize this was from two years ago, but I just subbed and have been working my way though these. I don’t think this is just a transformer with a selenium rectifier. Selenium rectifiers we’re early metallic based semiconductor junctions that acted similar to diodes. They were used to rectify AC to DC similar to how diodes do today. However most I’ve ever seen are fairly large and consist of several stacked plates. This looks to me to be a vibratory half wave rectifier (though it could be full wave). Essentially the AC current flowing through the coil induces a magnetic field in the metal “band” that the lever sits in and as the voltage alternates it will cause the lever to pull to one side versus the other. When it hits one side it will connect the output and pass the AC wave but not connect on the “negative” half of the wave. Add some step down transformers and a capacitor and you have yourself a DC signal. Full wave is likely possible but it would have to be more clever.