Atkinson, Philip. [from old catalog] · New York, The Century co. · leaf 37
Fig. 3. 16 ELECTRICITY FOR EVERYBODY. duction, which is similar to electric induction, in thenarrow air-space between the cylinder and pole-pieces.Within this space a coil of fine insulated copper wire,wound on a light copper frame, is mounted, as shown, … Fig. 4. and has a limited rotary motion in opposition to theforce of the two oppositely coiled flat spiral springsshown above and below, by which a light aluminumpointer, shown at the left above, is moved to the rightover the graduated scale shown in Fig. 3. This coil is connected, through the two…
Electricity
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