Brechner, Claude H., 1887- [from old catalog] · Boston, New York [etc.] Allyn and Bacon · leaf 169
Figure 146. — Photograph of a Hand Generator. … Figure 147. — Photograph of a 300 Horse Power D. C. Generator. SLIP-RIXGS 159 Thus we see that the pressure was first in one directionfor half a turn, and then in the opposite direction for half aturn. This is called alternating current pressure, and itmakes the current flow first in one direction…
Physics
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