Oral History of Defence Electronics

R G Wells: The race for power. The other trouble was the power supply. The Japanese main around the camp which provided the power was 110 volts roughly according to the power station meter which we couldn't help but see, because we delivered the wood there while the power station was running; I switched over when no one was looking and the frequency was about 60 Hz, not 50 Hz as we thought, not that this worried us anyway but to know that it was manageable. So two problems remained for the power supply. The first one was the A-battery or low voltage supply necessary for the filament of the valve. We started with a couple of dry cells, but these didn't last very long and we had to make something then. Through being friendly with the pharmacist with the party, we got some potassium bichromate and made up a bichromate cell, which is probably well known in the text books but not of very practical use. It's fairly hungry for zinc and it needs some sulphuric acid which one can't throw around or hide easily, but it served for some time and was quite successful but, in the end, had the operation lasted very long, we would have been in trouble for that. Two of these cells provided about 3 volts to 4 volts, and 6 volts was a bit too much because each cell was running at a bit over 2 volts, about 2.2 volts.

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