Cumming, Linnæus, b. 1843. [from old catalog] · New York, D. Van Nostrand · leaf 163
gree. Thislatter consists of two knobs (AB) placed one above the other; 144 Electricity, [Book II. the lower (B) is insulated, and connected with the knobs ofthe Ley den jars. The upper (A), which is also insulated,moves about a pivot within the hollow ball (0). It is counter-poised by a weight (D)… … Fig. 96. the discharge takes place between them. On the leverbetween A and C is a small sliding weight (F), which can beshifted along so as to alter the degree of charge necessary tobring down the upper knob. The experiments here givencan easily be done by a Leyden battery of four quart jarscharged…
Electricity
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