Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 372
Fig, 23. glowers 6, the ballast 7, and the cut-out coil 3 to terminal 2.By the time the current in the glower lias reached its normal value,the contacts at 4 and 4 have opened, cutting out the heater coils 310 ELECTRIC LIGHTING 29 entirely. The beaters are so arranged that if one is destroyed,…
Architecture · Building · Carpentry
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