Q. How would you proceed to figure the road speed of
traction.
A. Would first determine the circumference of driver, then
ascertain how many revolutions the engine made to one of the
drivers. Multiply the number of revolutions the engine makes
per minute by 60, this will give the number of revolutions of
engine per hour. Divide this by the number of revolutions the
engine makes to the drivers once, and this will give you the
number of revolutions the drivers will make in one hour, and
multiplying this by the circumference of driver in feet, and it
will tell you how many feet your engine is traveling per hour,
and this divided by 5280, the number of feet in a mile, would
tell you just what speed your engine would make on the road.
THINGS HANDY FOR THE ENGINEER
____________
The first edition of this work brought me a great many letters asking
where certain articles could be procured, what I would recommend, etc.
These questions required attention and as the writers had bought and
paid for their book it was due them that they get the benefit of my
experience, as nothing is so discouraging to the young engineer as to be
continually annoyed by unreliable and inferior fittings used more or
less on all engines.
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