. Electric railway journal . ] Weld The ground wire should be permanently connected tothe clamp, and the point on the work where the clampis to be attached should be perfectly clean and brightso as to insure a good connection between the clampand the work. For cleaning the dirt and oxides from surfaces onwhich welding is to take place there is nothing that willdo the job quite as well as the sand blast. There arecases where the scale is so heavy and hard that the useof a roughing tool is required to loosen the scale, afterwhich the sand blast is used to remove the small par-ticles untouched by
. Electric railway journal . ] Weld The ground wire should be permanently connected tothe clamp, and the point on the work where the clampis to be attached should be perfectly clean and brightso as to insure a good connection between the clampand the work. For cleaning the dirt and oxides from surfaces onwhich welding is to take place there is nothing that willdo the job quite as well as the sand blast. There arecases where the scale is so heavy and hard that the useof a roughing tool is required to loosen the scale, afterwhich the sand blast is used to remove the small par-ticles untouched by the roughing tool. It is found thata small portable type of sand blast is best suited for thisclass of work, as it can be taken into restricted spaces,. Curtains, 8 oz. Duck made in3pieces IZlap af back corners and 24rLap af mfh No. 137 b/ackpainf. FIG. 4. BOOTH FOR WELDING MISCELLANEOUS PARTS Table lo be made of sui fable Boffomreclaimed lumber Top of and Endsold boilerplafe -CABLE REEL FOR PORTABLE WELDING OUTFITS There should always be one or more stationary weld-ing booths located at some convenient place in the shop,where all the small miscellaneous parts may be broughtfor welding. Fig. 4 shows a sketch of a booth designedfor this purpose. The curtains are hung in such manneras to permit parts to be brought into the booth fromany one of the four sides. A space between the tableand the curtains is provided to prevent sparks fromlodging on, and burning holes in, the latter. The boothmay be made smaller than that shown if space is limited. The work on which welding is to be done forms oneof the poles of the circuit, and it is necessary that theconnection to the work be secure to aid the flow of thecurrent. The practice
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