It was rather unsteady, and when the machine was running
at its greatest velocity, a sudden gust lifted not only the front
end, but also the heavy front wheels completely off the track, and the
machine falling on soft ground was soon blown over by the wind.'
Consequently, a safety track was provided, consisting of squared pine
logs, three inches by nine inches, placed about two feet above the steel
way and having a thirty-foot gauge. Four extra wheels were fitted to the
machine on outriggers and so adjusted that, if the machine should
lift one inch clear of the steel rails, the wheels at the ends of the
outriggers would engage the under side of the pine trackway.
The first fully loaded run was made in a dead calm with 150 lbs. steam
pressure to the square inch, and there was no sign of the wheels leaving
the steel track. On a second run, with 230 lbs. steam pressure the
machine seemed to alternate between adherence to the lower and upper
tracks, as many as three of the outrigger wheels engaging at the same
time, and the weight on the steel rails being reduced practically to
nothing. In preparation for a third run, in which it was intended to use
full power, a dynamometer was attached to the machine and the engines
were started at 200 lbs. pressure, which was gradually increased to 310
lbs per square inch. The incline of the track, added to the reading of
the dynamometer, showed a total screw thrust of 2,164 lbs. After the
dynamometer test had been completed, and everything had been made ready
for trial in motion, careful observers were stationed on each side of
the track, and the order was given to release the machine. What follows
is best told in Maxim's own words:--
Public-domain text, read in full here on John Shaqi.
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