Small, Sidney Aylmer, 1876- [from old catalog] · Chicago, F. J. Drake & co · leaf 73
ter. 74 ELEMENTARY ELECTRICITY Prior to Wimshursts machine Holtz had constructedone with two oppositely-rotating glass disks; but they hadno metal carriers upon them. It was not self-exciting. Question 17. Give some experiments showing the ac-tion of electricity. Answer. Example 1. If a pivot be… … Fig. 26. Puncturing a Card with Spark from a Leyden Jar. Example 2. A card may be punctured as shown inFig. 26. There will be a burr on both sides of the hole inthe card as if the material were pulled out from the cardon both sides at the same time. ELECTRICAL MACHINES 75 Example 3. A fine wire…
Electricity
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