This tarry mass coming through the small openings
in the torches causes them to become partly closed and alters the
proportions of the gases to the detriment of the welding flame. The only
remedy for this trouble is to avoid its cause and secure cool generation.
Overheating can be detected by the appearance of the sludge remaining after
the gas has been made. Discoloration, yellow or brown, shows that there has
been trouble in this direction and the resultant effects at the torches may
be looked for. The abundance of water in the carbide to water machines
effects this cooling naturally and is a characteristic of well designed
machines of this class. It has been found best and has practically become a
fundamental rule of generation that a gallon of water must be provided for
each pound of carbide placed in the generator. With this ratio and a
generator large enough for the number of torches to be supplied, little
trouble need be looked for with overheating.
_Water to Carbide Generators._--It is, of course, much easier to
obtain a measured and regular flow of water than to obtain such a flow of
any solid substance, especially when the solid substance is in the form of
lumps, as is carbide This fact led to the use of a great many water-feed
generators for all classes of work, and this type is still in common use
for the small portable machines, such, for instance, as those used on motor
cars for the lamps.
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