. Cyclopedia of applied electricity : a practical guide for electricians, mechanics, engineers, students, telegraph and telephone operators, and all others interested in electricity . ■ ELECTRIC CHAIN-WELDING MACHINE. Joints. While in most cases of electric welding the jointforms what is known as a butt weld, with a burr or extension ofmetal at the joint, which, according to conditions, is either allowedto remain or is forged down or dressed off, there is no difficulty inmaking laj) welds electrically, and some of the recent work of theelectric welder is of that character. While, too, the usua
. Cyclopedia of applied electricity : a practical guide for electricians, mechanics, engineers, students, telegraph and telephone operators, and all others interested in electricity . ■ ELECTRIC CHAIN-WELDING MACHINE. Joints. While in most cases of electric welding the jointforms what is known as a butt weld, with a burr or extension ofmetal at the joint, which, according to conditions, is either allowedto remain or is forged down or dressed off, there is no difficulty inmaking laj) welds electrically, and some of the recent work of theelectric welder is of that character. While, too, the usual welding 407 10 ELECTRIC WELDING concerns pieces of the same metal, as iron to iron, steel to steel, orcopper to copper, combination welds of different metals are madewith facility in many cases, as when brass and iron are united. In the working of high-carbon steels the usual precautions toprevent burning or injury to the metal are, of course, required;. ROLLS OF ELECTRICALLY-WELDED WaRE FENCE. but, on account of the delicacy of heat control, they are more easilyadopted. Quite recently automatic chain welders have been put intouse, and electrically-welded chain work will probably soon attainan importance not second to the other principal applicationswhich have been briefly described. 408 REVIEW QFESTIONS. PRACTICAL TEST QUESTIONS. In the foregoing sections of this Cyclopedianumerous illustrative examples are worked out indetail in order to show the aiiplication of the variousmethods and principles. Accompanying these areexamples for practice which will aid the reader infixing the principles in mind. In the following pages are given a large numberof test questions and problems which afford a valu-able means of testing the readers knowledge of thesubjects treated. They will be found excellent prac-tice for those preparing for College, Civil Service,or Engineers License. In some cases numericalanswers are given as a further aid in this w
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