closely over and passes below the base, where it is soldered on with a
fusible metal that melts as soon as it is heated to 155 degrees.

As soon as a fire starts in any part of a building, heat will be
generated and immediately rise toward the ceiling, and the sprinkler
nearest the fire will become heated in a very few moments to the
required 155 degrees, when the cap will become loosened and will be
forced off by the power of the water. The water will then be spread in
fine spray on the ceiling over the fire, also directly on the fire and
all around for a diameter of from fourteen to eighteen feet. This spray
has been fully tried, and it is found to be entirely sufficient to
extinguish any fire within its reach which can be made of any ordinary
materials.

As soon as the cap on any sprinkler becomes loosened by the heat of a
fire and is forced off, a current of water is produced in the main pipe
where the alarm valve is placed, and as the passage through it is dosed,
the water cannot pass without opening the valve and thus moving the
lever to which the steam whistle valve is attached; by this motion the
whistle valve is opened, and the whistle will blow until it is stopped
by some one."

* * * * *




INSTRUMENT FOR DRAWING CONVERGING STRAIGHT LINES.

[Footnote: Paper by Prof. Fr. Smigaglia, read at the reunion of the