operate on the lines so as to cause the torpedo to ascend or descend as
the case may be.

In order to avoid the risk of a spent torpedo destroying a friendly
vessel, a valve is arranged in any suitable part of the outer casing, and
is weighted or loaded with a spring in such a manner that when under way
the pressure of the water keeps the valve closed, but when it stops the
valve opens and admits water to sink the torpedo.

In our description we have only given the main features of the invention,
the inventor having mentioned to us, in confidence, several improvements
designed to perfect the details of his invention, among which we may
mention the steering arrangement and arrangements for attacking a vessel
provided with what our contemporary, _Engineering_, not inaptly terms a
"crinoline," _i. e._, a network for keeping off torpedoes. The transverse
dimensions of our engravings have been considerably augmented for the sake
of clearness.--_Mech. World._

* * * * *




DUPUY DE LOME.


M. Dupuy De Lome died on the 1st Feb., 1885, at the age of 68. It may be
questioned whether any constructor has ever rendered greater services to
the navy of any country than those rendered by M. Dupuy to the French Navy
during the thirty years 1840-70. Since the fall of the Empire his