Mechanics of the household; a course of study devoted to domestic machinery and household mechanical appliances (1918)
Keene, E. S. (Edward Spencer), b. 1864 · New York, McGraw-Hill book company, inc.; · leaf 332
t cannot be variedat will. This feature is attained in theelectric turn-down lamp either by resistance added to the lampcircuit or by the use of two separate filaments in a single globe;one of ordinary lamp size and the other of such size that it con-sumes only a fraction as much energy as the… … Fig. 222.—Sectional viewof a turn-down lampsocket. 322 MECHANICS OF THE HOUSEHOLD a sectional view shows the ^^pull-string^ form of lamp in whichthe parts are exposed. The long filament H and the smaller oneL represent two individual lamps of different lighting power.The change in light is made…
Heating · Lighting · Plumbing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
