St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 129
126 HEAT PRODUCED BY ELECTRIC CURRENT. developed in the interior of the parts to be welded, theinterior of the joint is as efficiently united as the visibleexterior. With such a method and apparatus, it isfound possible to accomplish not only the common kindsof welding of iron and steel, but also…
Electricity
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Catalog]. (1908)](https://img.insideoutlibrary.com/img/200/ia-catalog00macy-434-1259.webp)
