International Library of Technology · Scranton, International Textbook Co. · leaf 205
th long, fine filaments. Fig. 3 shows the way in which the filaments are usuallymounted. The filament is fastened to the platinum wires a, a,which are sealed into the glass and thus render the globeair-tight. The junction between the filament and the leading-in wire is effected by means of carbon… … Fig. 4. 12. Tiie Leading-in Wires.—These are made of plati-num, because this metal has almost exactly the same coeffi-cient of expansion as glass, and also because it does notoxidize. If the glass and platinum did not expand at thesame rate when heated, cracks would form at the pointwhere the wires…
Electrical engineering
Internet Archive · Boston Library Consortium · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.], 1902, leaf 205](https://img.insideoutlibrary.com/img/1024/ia-electricengineer03inte-205-117.webp)
