Cyclopedia of architecture, carpentry, and building : a general reference work (1912)
American Technical Society · Chicago : American Technical Society · leaf 143
Fig. 15. Multiple Tungsten Lamp. Fig. 1 6. Series Tungsten Lamp. on commercial voltages. In some cases tungsten lamps are con-structed for lower voltages and are used on commercial circuits throughthe agency of small step-down transformers. Improvements in theprocess of manufacture of filaments and…
Architecture · Building
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