Trebel, George. [from old catalog] · New York, F. Tousey · leaf 30
light it by the heatof the wire. If lycopodium powder is strewed over cotton wooland is touched with the hot wire it will ignite. Connect one wire to an ordinary file or rasp in a dark roomrand rub the other wire over the rough surface of the tile. Asthe wire passes over it the circuit is rapidly… … For the following experiment a V-shaped tube is necessary,which may be made by beating an ordinary glass tube in aBunsen or oxy-hydrogen flame, and bending when it has ac-quired a cherry colored heat. Steep some leaves of purple cabbage, the solution has adeep purple color. Dissolve a little…
Electricity
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