Stewart, Balfour, 1828-1887 · Toronto : James Campbell · leaf 126
eral miles in length, whereas an electric sparkis only a few inches. iioniEs.J /^/jysjcs. IS 83. Electrical Machine.—You are now in a position to understand the construction of an electricmachine. Such a machine is composed of two parts ;we have first of all an arrangement for producingelectricity,… … Fig. 4? revolves, it is rubbed against by two sets of rubbers,one above and the other below. These rubbers areusually xTiade of leather stuffed with horse-hair, so asto press rather tightly against the glass. They arecoated with a soft metal, which is spread over theleather, and this metal is…
Physics
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