Ferris, Richard. [from old catalog] · New York, T. Nelson and sons · leaf 202
low of oil is being pumpedthrough the oiling system. The electric current w^hich produces the sparkinside of the cylinder is supplied by a magneto, amachine formed of permanent magnets of horseshoeform, between the poles of which a magnetized arma-ture is made to revolve rapidly by the… … 202 FLYING MACHINES: MOTORS, The great rivalry of the builders of motors hasbeen in cutting down the weight per horse-power tothe lowest possible figure. It goes without sayingthat useless weight is a disadvantage in an aeroplane,but it has not been proven that the very lightest en-
Aeronautics
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