Sweet’s indexed catalogue of building construction for the year 1906 (1906)
New York : Chicago : Architectural Record · leaf 710
[. NORTHERN SPHER-ICAL MACHINE … NORTHERN RING TYPE MACHINES—For general industrial plant power and lighting service,we build our apparatus in sizes above 75 H.P. (motors) and 60 K.W. (dynamos), in the RingType Frame illustrated in Fig. 2. This consists of a horizontally split field. The armaturebearings are carried by the machine…
Building materials
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