A Short Course of Experiments in Physical Measurement, Vol. 3 of 4: Principles and Methods (Classic Reprint) - Softcover

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Excerpt from A Short Course of Experiments in Physical Measurement<br/><br/>Fur of Cat. Feathers. Silk. Polished Glass. Wood Shellac. Wooden Stuffs. Paper. Rough Glass. If any of the substances in this list be rubbed with one following it, it will generally become posi tively electrified; but if rubbed with one preceding it, it will be negatively electrified. Such an ar rangement is evidently more useful than a Simple division into two classes.

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