Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 371
e, and this resist- 308 ELECTKTC LIGHTING 27 ance is so adjusted that the resistance of the couiOined circuitreaches a constant value when the current is of the proper strength.The iron wire must be protected from the air to prevent oxidiza-tion and too rapid temperature changes, and, for this… … Fig. 20.other gases. Fig. 19 shows the form of bulb which contains theballast. All of the parts enumerated, namely, glower, heater, cut-outand ballast, are mounted in a suitable manner, the smaller lampshaving but one glower and arranged to fit an incandescent lampsocket, while the larger types…
Architecture · Building · Carpentry
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