Inside Out Library · ExploreAn Impulse Electric Motor for Driving Recording Instruments (1923)NASA Technical Reports Server (NTRS) · leaf 16y Air gap in inches Fig-3 Magnetic force variation for small air gapsNASA Technical Reports Server (NTRS)Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.More pictures from An Impulse Electric Motor for Driving Recording InstrumentsMore like this
