Since wet wood likely caused an electrical short between the graphite and the part, that was a bad call. Little work was accomplished in that session. Changed some of the wood to PVC pipe.

My battery charger has a built in amp meter. Previously, using 4 graphite blocks, the process pulled 2 or 3 amps, and the results were very good. Now for some reason, using 5 blocks pulls 7 amps, which makes a lot of bubbles and is more amperage than recommended. The 7 amps probably also wastes graphite.

So I spliced a muscle car era #1157 tail light bulb into the circuit, and that pulled the power down. This is a mystery to me: If I light up the smaller and dimmer tail light filament, the process pulls 1 amp. But if I light up the much brighter brake light filament, the process pulls 2 amps. Somebody please explain that to me.