Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics (1892)
Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 570
it is again cutout. But it is evident that during each of these idle periods of the armature to the right,that to the left comes into circuit and goes through relatively the same cycle of operations. The action is quite analogous to thatin two steam engines coupled with theircranks at right angles…
Mechanical engineering
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