be got at work. It is most desirable, however, in all cases to have an
abundant water supply without resorting to pumps, if it is possible.

In the main supply pipe or pipes is placed our patent alarm valve,
which, as soon as there is any motion of the water in the pipe, opens,
and moves a lever, which, by connecting with a steam whistle valve by
means of a wire, will blow the whistle and will continue to do so until
either the steam or the water is stopped. Tins constitutes the alarm,
and is positive in its motion. No water can possibly flow from the line
of pipes without opening this valve and blowing the whistle. We also put
in an automatic alarm bell when desired.

From the main pipe other pipes are run, generally lengthways of the
building, ten feet from each side and twenty feet apart. At every ten
feet on these pipes we place five feet of three-quarter inch pipe,
reaching each side, at the end of which is placed the sprinkler in an
elbow pointing toward the ceiling. This arrangement is as we place them
in all cotton and woolen mills, but may be varied to suit different
styles of buildings.

The sprinkler is made of brass, and has a revolving head, with four
slots, from which the water flies in a very fine and dense spray on
everything, and filling the air very completely for a radius of seven or
eight feet all around; thus rendering the existence of any fire in that
space perfectly impossible; and as the sprinklers are only placed ten
feet apart, and a fire cannot start at a greater distance than from five
to six feet from one or more of them, it is assured that all parts of a
building are fully protected.

Over each one of these sprinklers is placed a brass cap, which fits