The top should be rectangular, about two feet wide and two and one-half
feet long. The legs should support the working surface at a height of
thirty-two to thirty-six inches from the floor. Metal lattice work may be
fastened or laid in the top framework and used to support a layer of
firebrick bound together with a mixture of one-third cement and two-thirds
fireclay. The piece being welded is braced and supported on this table with
pieces of firebrick so that it will remain stationary during the operation.
Holders for supporting the tanks of gas may be
made or purchased in forms that rest directly on the floor or that are
mounted on wheels. These holders are quite useful where the floor or ground
is very uneven.
_Hose._--All permanent lines from tanks and generators to the torches
are made with piping rigidly supported, but the short distance from the end
of the pipe line to the torch itself is completed with a flexible hose so
that the operator may be free in his movements while welding. An accident
through which the gases mix in the hose and are ignited will burst this
part of the equipment, with more or less painful results to the person
handling it. For that reason it is well to use hose with great enough
strength to withstand excessive pressure.
A poor grade of hose will also break down inside and clog the flow of gas,
both through itself and through the parts of the torch. To avoid outside
damage and cuts this hose is sometimes encased with coiled sheet metal.
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