We illustrate a new form of self-propelling and steering torpedo, designed
and patented by Mr. Richard Paulson, of Boon Hills, Langwith, Notts. That
torpedoes will play an important part in the next naval war is evident
from the fact that great activity is being displayed by the various
governments of the world in the construction of this weapon. Our own
Government also has latterly paid great attention to this subject.
The methods hitherto proposed for propelling torpedoes have been by means
of carbonic acid or other compressed gas carried by the torpedoes, and by
means of electricity conveyed by a conductor leading from a controlling
station to electrical apparatus carried by the torpedo. The first method
has, to a considerable extent, failed on account of the inefficient way in
which the compressed gas was employed to propel the torpedo. The second is
open to the objection that by means of telephones placed in the water or
by other signaling apparatus the torpedo can be heard approaching while
yet at a considerable distance, and that a quick speeded dredger, kept
ready for the purpose when any attack is expected, can be run between the
torpedo and the controlling station and the conductor cut and the torpedo
captured. The arrangements for steering by means of an electrical
conductor from a controlling station are also open to the latter
objection. The torpedo we now illustrate, in elevation in Fig. 1, and in
plan in Fig. 2, is designed to obviate these objections, and possesses in
addition other advantages which will be enumerated in the following
description.
As stated above, the torpedo is self-propelling, the necessary energy
being stored up in liquefied carbonic acid contained in a cylindrical
vessel, E, carried by the torpedo. The vessel, E, communicates, by means
of a small bent pipe extending nearly to its bottom, with a small chamber,
B, the passage of the liquid being controlled by means of the cock or tap,
F. The chamber, B, is in communication, by means of a small aperture, with
the nozzle, G, of an injector, T, constructed on the ordinary principles.
The liquid as it passes into the chamber, B, volatilizes, and the gas
passes through the nozzle of the injector, which is surrounded by water in
direct communication with the sea by means of the opening, W. The gas
imparts its energy in the well-known manner to the water, being itself
entirely or partially condensed, the water thus charged with carbonic acid
gas being forced through the combining cone of the injector at a very high
speed and pressure. Preferably the water is here divided into two streams,
each driving a separate rotary motor or turbine, H, themselves driving
twin screws or propellers, I. The motors exhaust into the hollow shafts,
J, of the propellers, which are extended some distance beyond the
propellers, so that the remaining energy of the water may be utilized to
aid in propelling the torpedo on the well known principle of jet
propulsion. The torpedo is preferably steered by means of the twin screws.
A disk or other valve, A, is pivoted in an aperture in a diaphragm
dividing the outlet of the injector, and is operated by means hereafter
described, so as to diminish the stream of water on one side and increase
it on the other, so that one motor, and consequently the corresponding
propeller, is driven at a higher speed than the other, and so steers the
torpedo.
[Illustration: PAULSON'S SELF PROPELLING AND STEERING TORPEDO.]
The valve, A, is operated automatically by the following arrangement: A
mariner's compass, P, placed in the head of the torpedo has its needle
connected to one pole of a powerful battery, D. A dial of non-magnetic
material marked with the points of the compass is capable of being rotated
by the connections shown. This dial carries two insulated studs, _p_, each
electrically connected with one terminal of the coils of an electromagnet,
K, whose other terminal is connected to the other pole of the battery.
These two magnets are arranged on opposite sides of an armature fixed on a
lever operating the disk or valve, A. Before launching the torpedo the
dial is set, so that when the torpedo is steering direct for the object to
be struck, or other desired point, one end of the needle of the compass,
P, is between the steeds, _p_, but contact with neither, the needle of
course pointing to the magnetic north. Should the torpedo however deviate
from this course, the needle makes contact with one or other of the studs
according to the direction in which the deviation takes place, and
completes the circuit through the corresponding electromagnet, which
attracts the armature and causes the disk to move, so as to diminish the
supply of water to one motor and increase it to the other, and so cause
the torpedo to again assume the required direction. Supposing the object
which it is intended that the torpedo should strike be a large mass of
iron, such as an ironclad, the needle will be attracted, and, making the
corresponding contact, will cause the torpedo to be steered directly away
from the object. In order to prevent this, a second compass, Q, is mounted
in the front of the torpedo, and when attracted by a mass of iron, it
short-circuits the battery, D, and thus prevents the armature being
attracted, and consequently the torpedo from deviating. This needle is
also capable of slight movement in a vertical plane, so that when passing
over or under a mass of iron it is attracted downward or upward, and
completes a circuit by means of the stops, which operate so as to explode
the charge. The charge can also be exploded in the ordinary manner, viz.,
by means of the firing pin, X, when the torpedo runs into any solid
object.
The depth at which the torpedo travels below the surface of the water is
regulated by means of a flexible diaphragm, M, secured in the outer casing
and connected to a rod sliding freely in fixed bearings. A spiral or other
spring, O, is compressed between a color on the rod and an adjustable
fixed nut, by which the tension of the spring is regulated so that the
pressure of water on the diaphragm, A, when the torpedo is at the desired
depth just counterbalances the pressure of the spring, the diaphragm being
then flush with the outer casing. The rod is connected by suitable levers
to two horizontal fins, S, pivoted one on either side of the torpedo, so
that they shall be in equilibrium. Should the torpedo sink too deep or
rise too high, the diaphragm will be depressed or extended, and will
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._
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