thus describes a method of detect- is almost entirely dependent upon the manual dexte- a revolving drill. In all these cases the metal is at- ing leaks in underground gas pipes : tached to the block and treated as shown in Fig. 1. rity of the operator. A kind of repousse is here sug- Test holes are… … Fig. 1.-EMB0SSING THIN METAL. Fig. 3.-R0PE PATTERN. tion a die formed of a small rope glued in a semicircu- It is not, however, assumed that any set of devices can three feet long are inserted. In the upper ends of lar groove in a bar of hard wood. The embossing is be made to serve in lieu of taste…
Asks · Patents · Adapted · Munn · Scientific American · Iron · Cartridge case · Waste pipe · Horse power · Slag escape · Multiple switch · Inches long · Steam engine · Electric light · Switch board
Internet Archive · Public domain (published before 1931). Free to use for anything.
