(Fig. 31.) Many thought this
perfect, while others were not satisfied, and began experiments for
something better. A device for using gas had been patented, but it was
somewhat complicated, as well as expensive, and did not meet with
general favor. A very simple device was soon hit upon. A two inch pipe
was bent around in a circle a little larger than the outer rim of the
wheel. Holes 1/10 in. in diameter and 3 or 4 in. apart were drilled
through the pipe on the inside of the circle. To this pipe was
fastened another with a branch or fork upon it. To one branch or fork
was connected a gas pipe from the meter, while to the other was
connected a pipe from an air pump. With the ordinary pressure of city
gas upon this pipe it was found that the air pump must keep an air
pressure of 40 pounds, that the air and gas might mix properly at the
branch or fork, so we could get the best combustion and most heat from
our "blowpipe," for such it was. (Fig. 32.)
[Illustration: FIG. 31 and FIG. 32]
We were able to heat a tire so it could be moved in ten to twenty
minutes, and the machine may be said to have been satisfactory.
Gas, however, was not to be had at all places where it would be
necessary to change tires, and the item of cost was considerable.
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