Sweet’s indexed catalogue of building construction for the year 1906 (1906)
New York : Chicago : Architectural Record · leaf 710
pe NORTHERN BACK-GEARED MOTORS—Designed to supply slow speeds—a combination of stand-ard spherical construction with speed reducing counter shaft, giving slow speed with slight addi-tion to motor cost. Ordinary slow speed motors, in which the initial or armature speed is low, arelarge and hence…
Building materials
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