re of such high volt- tain a vacuum ; for the eight-inch spark of a Ruhmkorft peculiar apparatus called Planté’s rheostatic machine, age. When we reflect that the trolley car employs only I am enabled to obtain over one million volts—which coil prefers to jump around the tube to passing through the… … one gives two volts and has an internal resistance of is very great. For instance, photographic plates ina one-quarter of an ohm. The problem of insulating plate holder carefully insulated from the ground and these cells was a serious one; but it was practically covered with a plate of glass half…
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