6. All parts which are constantly in motion are equipped with
ring-oiling bearings.
Fig. 576 is an illustration of the mechanism necessary to raise and
lower _the head gates_ which are used to admit and regulate, also to
shut off the water supply from pond or lake _to the flume conveying it
to the wheel_. In this case there are two head gates having racks upon
the upright timbers connecting with the gates. Two shrouded pinions
engage these racks, which are keyed upon a shaft having a large spur
wheel at its end, as represented. A pinion upon a second shaft engages
this spur wheel which in turn has also a spur wheel which engages a
pinion upon the crank shaft having two cranks opposite one another. By
means of these cranks with two to four men upon each crank the gates
are operated very satisfactorily. These shafts and gears are mounted
upon heavy cast iron brackets bolted to the floor. Altogether it forms
a very massive piece of mechanism.
_The Utility combination pump governor_ is shown in the figure below.
This mechanism may be bolted on any tank or receiver where the water
level is to be automatically maintained. It consists of a closed pocket
containing a float, A, which rises and falls with the water level
inside the tank.
When the water rises above the desired level the float opens the
throttle valve and starts the pump, and when it subsides the float
falls and shuts off the steam.
[Illustration: Utility combination pump governor.]
CONDENSING
APPARATUS
[Illustration: FIG. 577.]