Hawkins, N. (Nehemiah), 1833- · New York : Theo. Audel · leaf 253
eet iron, which it has beendemonstrated give a better electrical efficiency than a solidiron. Soft iron is the most magnetic of all metals and is bettersuited for pole pieces than steel. It should be understood that each individual pole piece isinsulated from the others as well as from the spider.… … Figs. 226-229. Fig. 230 is designed to illustrate the front of a continuouscurrent two wire switchboard with circuit breakers; these aremade up usually of marble or slate so that they will not burn ;the Insurance Underwriters require a non-combustible materialat this place, as well as hangers, and…
Hydraulic machinery · Pumping machinery
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
