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London Transport (uk.transport.london) Discussion of all forms of transport in London. |
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GTE Telephone line numbers
On Apr 9, 12:50*am, spsffan wrote:
No. 6 batteries It rather makes sense, as I seem to recall them mostly in science labs and science experiment kits of the kind marketed to adolescent boys. I seem to recall that my brother used one with a practice telegraph key, which had a flashlight bulb to give feedback in learning Morse Code. Stuff like that! The "How & Why Wonder Book on Electricity" had projects for kids using a No. 6 dry cell. They taught about series and parallel wiring. I remember wrapping wire around a big nail to make an eloctromagnet, and turning it off and on to pick up papercliops. But the nail retained some of its magnetism. I _think_ a battery cost about $1 back then and it would last forever. The local store had all the knife switches, light sockets, 1.5V screw maps that I could want for my experiments. Connecting a 6V lantern battery to a 1.5V burned it out in a flash. Returning to rail, many places were lit by five bulbs in series off the 600V traction power. If a bulb burned out they all did. But I think some fancy trains had special circuits to bypass a dead bulb. |
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