They have one steam dome between them. The total
heating surface is 1,700 square feet, the total steam space is 330 cubic
feet, and the working pressure 100 lb. per square inch.
The fire pump is a Wilson's "Excelsior," with 10 inch steam cylinder and
8 inch water barrel. This powerful pump is in a special compartment of
the fore hold, and will draw water from the bilge, sea, or either hold.
A steam windlass and a double-handle winch are on deck as shown. On
trial trip the engines of the Churchill indicated a maximum of 645.5
horse power, driving the vessel 10.495 knots per hour. The vessel is
remarkable for diversity of uses, for heavy engine power in a small
hull, and for general compactness of arrangement.--_Engineering_.
* * * * *
THREE-WAY TUNNELS.
Mr. T.R. Cramton, who at the Southampton meeting of the British
Association suggested a method of tunneling which, under certain
conditions, seems of excellent promise, brought forward a suggestion at
Southport for the construction of three-way tunnels.
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