International Library of Technology · Scranton, International Textbook Co. · leaf 439
ines. These spools are made so as to slipover the pole-pieces, and are usually held in place by pinsprojecting from the pole or by cap bolts screwed throughlugs projecting from the end flanges of the spool. Fig. 1637shows an end elevation and a cross-sectional view of a spoolof the style commonly… … Fig. 1637. flanges are usually recessed and provided with ribs to makethem stiff and at the same time secure lightness. The ends of the spool are rounded out asshown, so as to give clearance forthe heads of the bolts which clampthe pole-pieces together. In design-ing field coils and spools, care…
Electrical engineering
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