Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 372
Fig. 21. contacts of the cut-out 4, to the heater circuit 5, then to the con-tacts 4 and to terminal 2. When the glowers become hot enoughto conduct, the current divides at 1, part of it going through the
Architecture · Building · Carpentry
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