[Illustration: Fig. 1.]
[Illustration: Fig. 2. CLARK'S GYROSCOPIC TORPEDOES.]
Fig. 2 represents an air torpedo proposed by the same inventor. The
air reservoir, C, revolves along with the gearings under the action
of the pneumatic machine, D. The central shaft is hollow, so as to
serve as a conduit. The admission of air into the slide valve of the
machine is regulated by a clockwork which actuates a slide in an
aperture whose form and dimensions are so calculated that the speed
remains as constant as possible toward the end of the travel.
The trajectory of the two torpedoes is regulated by a cylindrical
bellows, F, which gives entrance to the sea water. The springs shown
in the figure balance the hydraulic pressure. The tension of these
springs is regulated by the rod, H, according to the indications of
the scale of depths, I.
When the torpedo reaches too great a depth, the action of the springs
can no longer balance the increase of the hydraulic pressure, and the
accumulation of the charge in the rear causes the front to rise toward
the surface. When the torpedo reaches the surface, a contrary action
is produced.--_Revue Industrielle._
* * * * *
THE FIRST STEAMBOAT ON THE SEINE.
[Illustration: FIRST STEAMBOAT BUILT ON THE SEINE.]
The accompanying engraving represents the remarkable steamboat that
the unfortunate Marquis de Jouffroy constructed at Paris in 1816,
after organizing a company for the carriage of passengers on the
Seine.
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