Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 466
ill withten Vfe inch holes, spaced 3 inch centers and beginning 2 inches from the end of the rail.The joint has been applied thus far exclusively to 7 inch girder groove rail weighing 103pounds per yard. These 7 inch girders sections are undercut by the manufacturers %inch so as to provide a space… … «tet Fig. 4,498.—Thermit preheater. Directions for operating: The preheater is connectedwith compressed air supply at A. The air pressure should be at least 15 lbs. per sq. in.,but 50 lbs. or more is recommended. Valve B allows the compressed air to flow into thetop of the gasoline tank and places…
Electrical engineering
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