Guest
Three Edison fans of the 1890s: six-blade bi-polar, Ironclad, and four-blade bi-polar. Two small corrections: the Ironclad was not changed to ball bearings in 1898, when the bi-polar styles were. It retained sleeve bearings however that was the year that the motor in the Ironclad was redesigned with cylindrical commutator instead of flat, and the rear window was eliminated. The speed was 1000 rpm, not 100.
