THE use of electricity as a means of welding or cut ting metals, repairing cracks or breaks, recovering defective castings and for similar purposes, all gener ally included under electric welding, has only recently been realized to any extent by manufacturers and engineers. Although comparatively simple in theory, the development of the use of electricity in this form has been slower than any other service to which this power has been applied. This slow growth can be attributed to several

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... , the principal ones being the scarcity of skilled operators and suitable apparatus for performing the operation, and the lack of accurate