which employ water as a seal are now required by the insurance rules
Mechanical check valves have been found unsuitable for this use and those
which employ water as a seal are now required by the insurance rules. The
valve itself (Figure 13) consists of a large cylinder containing water to a
certain depth, which is indicated on the […]

A. A combination boiler check is fitted with a valve similar to a globe
valve and can be closed at will. Its advantage is that the boiler
pressure can be shut off from the check and the valve repaired without
cooling the boiler. This hand-operated valve can be closed to prevent
the boiler water passing back in case the […]

of packing and obstructions under the valves
There are other causes that would prevent the pump working besides lack
of packing and obstructions under the valves. The valve may stick.
When it is raised to allow the water to flow through, it may stick in
the valve chamber and refuse to settle back in the seat. This […]

tention, neither too tight or too loose, running at a
For instance, a I inch belt of the standard grade with the proper
tention, neither too tight or too loose, running at a. maximum spead of
800 ft. a minute will transmit one horse power, running 1600 ft. 2 horse
power and 2400 ft. 3 horse power. A 2 […]

_A._–By comparing the actual speed of the vessel with the speed due to the
pitch and number of revolutions of the screw, or, what is the same thing,
the speed which the vessel would attain if the screw worked in a solid nut.
The difference between the actual speed and this hypothetical speed, is the
slip.

is flowing while they are in contact are separated from each other quite
slowly, a brilliant arc of flame is formed between them which consists
mainly of carbon vapor
If the ends of two pieces of carbon through which a current of electricity
is flowing while they are in contact are separated from each other quite
slowly, a brilliant arc […]

driving a flying machine in place of simple human exertion, but
he, like Cayley, saw a drawback to this in the weight of the
necessary engine
At the end of his work Walker admits the idea of steam power for
driving a flying machine in place of simple human exertion, but
he, like Cayley, saw a drawback to this in […]

motor-cylinder pushes the piston (which may be likened to the
projectile), and the power thus generated turns a crank and drives the
wheels
A gasoline motor is somewhat like a gun–the explosion of the gas in the
motor-cylinder pushes the piston (which may be likened to the
projectile), and the power thus generated turns a crank and drives the
wheels.

_Experiment No. 2._
–The first of these experiments, which in this
series will be called No. 2, was simple, and was made in order to show
that this material does not flow readily under ordinary conditions, when
not coupled with the discharge of water under high velocity. A bucket 12
in. in diameter, containing another bucket 9 in. in diameter, […]

_A._–I would first ascertain the resistance which had to be overcome, and
the velocity with which it was necessary to overcome it. I should then be
in a position to know what pressure and volume of steam were required to
overcome the resistance at the prescribed rate of motion; and, finally, I
should allow a sufficient heating and fire […]