We may now consider the heating of blanks for stamping, hardening the
points of spindles, finishing the ends of umbrella tips, and work where
a small article, or a small part of any article, has to be heated to a
high temperature with speed and certainty. For these a long and narrow
flame is necessary, and I may mention that in cases where a high speed
of delivery is required, and a small part only has to be heated, such
as, for instance, in the hardening of the points of spindles for cotton
machinery, I have made burners giving a flame of exceedingly high
temperature only 1/4 inch wide and five feet long. This flame is produced
by the assistance of a blast of air, and is of sufficiently high
temperature to fuse the spindle in a few minutes.
The points only project over the flame, and the spindles are carried
mechanically at such a speed that at the end of the five feet traverse
they are red hot, and drop into water. More than one hundred are in the
flame at once, lying side by side.
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