Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 236
his causes the plunger to be drawninto its coil with variable energy, according to the laws ofthe magnetic circuit, by which it continually so tends toplace itself that it shall be in the field of maximum induc-tion at any one time. The action is only in one direction—after reaching the maximum, at…
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