ld not be so liable to draw the
water or prime in making the hard pull.

Q. Why a very hot fire?
A. So I could start the pumps full without impairing or
cutting the pressure.

Q. When would you start your pump?
A. As soon as fairly started up the hill.

Q. Why?
A. As most hills have two sides, I would start them full in
order to have a safe gauge to go down, without stoping to pump
up.

Q. What would a careful engineer do before starting to pull
a load over a steep hill?
A. He would examine his clutch, or gear pin.

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. I have gone over my letter file and every article
asked for will be taken up in the order, showing the relative importance
of each article in the minds of engineers. For instance, more letters
reached me asking for a good brand of oil than any other one article.
Then comes injectors, lubricators have third place, and so on down the
list. Now without any intention of advertising anybody's goods I will
give you the benefit of my years of experience and will be very careful
not to mention or recommend anything which is not strictly first class,
at least so in my opinion, and as good as can be had in its class, yet
in saying that these articles are good does not say that others