level, two gauge cocks, a pressure gauge, two spring safety valves, a
steam cock provided with a rubber tube that connects with that of the
stove, an ash pan, and a smoke stack. In the rear there are two
cylindrical water reservoirs that communicate with each other, and are
designed to feed the boiler through an injector. Beneath these
reservoirs there is a fuel box. In front there is a seat whose box
serves to hold tools and various other objects.--_La Nature._

* * * * *




AN ELECTRICAL GOVERNOR.


We abstract the following from a paper on electric lighting by Prof.
J.A. Fleeming, read before the Iron and Steel Institute, Manchester.
The illustration is from _Engineering_.

[Illustration: ELECTRICAL GOVERNOR.]

One of the questions which most frequently occurs in reference to mill
and factory lighting is whether the factory engines can be used to run
the dynamo. As a broad, general rule, there can be no question that
the best results are obtained by using a separate dynamo engine,
controlled by a good governor, set apart for that purpose. With an
ordinary shunt dynamo, the speed ought not to vary more than 2 or 3
per cent. of its normal value on either side of that value. Hence, if
a dynamo has a normal speed of 1,000, it should certainly not vary