Word: tinsmithing
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Dates: during 1926-1926
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...evolved. The "Stable-Arc" welders used by the Morgan Co. were built by the Lincoln Electric Co. of Cleveland and mounted on hand trucks. The process: a high frequency arc up to 300 volts is applied to a bar of steel corresponding to a bar of tinsmith's solder, which is pressed along the crevice between two surfaces that are to be joined. The bar is melted, as are both the girder surfaces along the line of the joint, and the molten strip thus formed fuses instantly to a connection of solid metal...