The
same arrangement may be used with advantage for tempering small cutters
for ornamental turning, penknife-blades, etc., and in these cases the
cooler part of the plate is of great value, as it enables the thicker
parts to be slowly and equally heated up; the application of a
mechanical arrangement to pass the articles to be heated in a regular
succession is a matter easily managed.
[Illustration: FIG. 3. BLUEING WATCH HANDS & TEMPERING SMALL TOOLS]
Among other things which have several times come under my notice may be
mentioned cremation furnaces, but I have not yet met, with, or been
able to devise, any burner for ordinary coal gas which has worked
satisfactorily. This fuel is apparently unfitted for the work, and
the best arrangement I know is a number of pipes delivering ordinary
"producer" gas from the Wilson or Dowson generators, in exactly the
same way as is at present used for firing horizontal steam boilers. For
heating book finishers' tools, a ring-flame is the simplest, the tools
being supported a little distance above the flame; the usual plan of
heating a plate, and placing the ends of the tools on this, necessitates
at least double the gas consumption as compared with an open flame.
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