Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 346
o small variations in thespeed of driving pulley, and slight unsteadiness of theexciting current supplied to the field coils, there were slightvariations in the external circuit of the machine. The com-mutator had forty bars, and readings were taken with therotating brush successively on each bar.…
Science · Technology · Meteorology · Patents
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