IMPROVEMENTS IN SCREW PROPELLERS APPLICABLE TO SHIPS AND VESSELS OF ALL KINDS
Year: 1876

page_text: LETTERS PATENT to John Garrett Tongue, of the Firm of Tongue and Birkbeck,
Patent Agents and Engineers, of 34, Southampton Buildings, Chancery Lane,
in the County of Middlesex, for the Invention of "IMPROVEMENTS IN SCREW
PROPELLERS APPLICABLE TO SHIPS AND VESSELS OF ALL KINDS."
A com-
munication from abroad by Paul Jacquel, Manufacturer, Paris, France.
PROVISIONAL SPECIFICATION left by the said John Garrott Tongue at the
Office of the Commissioners of Patents on the 28th September 1876.
JOHN GARRETT TONGUE, of the Firm of Tongue and Birkbeck, Patent Agents
and Engineers, of 34, Southampton Buildings, Chancery Lane, in the County of
Middlesex. "IMPROVEMENTS
IN SCREW PROPELLERS APPLICABLE TO SHIPS AND
VESSELS OF ALL KINDS." A communication from abroad by Paul Jacquel, Manu-
facturer, Paris, France.
This Invention relates to improvements in screw propellers applicable to all kinds
of ships and vessels.
Up to the present time the use of steam tugs on canals has been objectionable on
account of the rapid deterioration to the edges or shore caused by the surge
resulting from the action of the paddle wheels or screw propellers. The screw as
applied at the stern of the vessel causes great difficulty in working the vessel
through locks or sluices, which often succeed one another at short distances.
In order to avoid these inconveniences according to these improvements the
screw propeller is placed or arranged inside of the vessel and surrounded by a
casing, which extending sufficiently backwards maintains and concentrates in a
small space the surge produced by the movement of the steam ship or vessel, and
thereby avoids damage to the edges or shore of the canal.
The casing or chamber in which the screw revolves must be supplied with as
much water as the screw can eject. For this purpose a current of water is obtained
from the inlet to the outlet of the casing, in which the screw will work freely.
This current of water is obtained by means of two cylinders, tubes, or passages
connected to the casing, and let into openings formed in the right and left sides of
the vessel at a suitable inclination. If by means of a valve the water is prevented
from flowing through one of the tubes, passages, or channels, the vessel will turn or

page_text: steer as if worked by the helm or rudder, the bow of the vessel taking a different
direction, thus it is evident that by stopping the inlet of water to either of the
tubes the vessel will turn and the bow will take a right or left direction, according
to the side on which the tube is left open, exactly as if the direction of the ship was
governed by her helm or rudder.
According to this Invention the screw worked in a chamber or casing serves to
steer the ship in place of the helm or rudder.
Great advantages are obtained by these improvements, for the screw being placed
inside of the ship is out of sight and out of danger of being damaged.
The Drawings hereto annexed represent a vessel having the screw placed or
arranged in accordance with this Invention.
Figure 1, Sheet 1, shows an elevation or longitudinal section of the back part of
a vessel arranged with a screw propeller in accordance with this Invention;
Figure 2, Sheet 2, shows an end view of the same; Figure 3 shows a plan of the
same.
In all these Figures the same letters refer to the same parts.
A represents part of the ship or vessel; the screw B is fixed at the end of the
axle C; the cylindrical casing in which the screw revolves is shown at the stern of
the ship by D; the two inlet tubes in front of the screw are shown by E, E. Two
valves F, F, placed at the entrance to the tubes or passages E serve to regulate or
intercept the inlet of water. These valves are worked from the deck of the ship,
the same as the wheel of an ordinary helin or rudder. G shows the steam engine
or other motive power. The two tubes or passages E, E, being open the vessel is
propelled in a straight line, or turns by closing either one or the other of the inlets
of the tubes. By closing the two inlets at the same time the speed of the vessel is
slackened.
These improvements may be applied to any kind of ship or vessel, and in order
to obtain greater speed the casing and tubes may be of any form or dimension,
and by a regulated supply of water to the screw the speed or course of the ship may
be varied.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Garrett Tongue in the Great Seal Patent Office on the 28th
March 1877.
JOHN GARRETT TONGUE, of the Firm of Tongue and Birkbeck, Patent Agents
and Engineers, of 34, Southampton Buildings, Chancery Lane, in the County of
Middlesex. "IMPROVEMENTS IN SCREW PROPELLERS, APPLICABLE TO SHIPS AND
VESSELS OF ALL KINDS." A communication from abroad by Paul Jacquel, Manu-
facturer, Paris, France.
This Invention relates to improvements in screw propellers applicable to all kinds
of ships and vessels.
Up to the present time the use of steam tugs on canals has been objectionable on
account of the rapid deterioration to the edges or shores caused by the surge
resulting from the action of the paddle wheels or screw propellers. The screw as
applied at the stern of the vessel causes great difficulty in working the vessel
through locks or sluices, which often succeed one another at short distances.
In order to avoid these inconveniences according to these improvements the
screw propeller is placed or arranged inside of the vessel, and surrounded by a
casing, which extending sufficiently backwards maintains and concentrates in a
small space the surge produced by the movement of the steam ship or vessel, and
thereby avoids damage to the edges or shores of the canal.
The casing or chamber in which the screw revolves must be supplied with as
much water as the screw can eject. For this purpose a current of water is obtained
from the inlet to the outlet of the casing, in which the screw will work freely.

page_text: This current of water is obtained by means of two cylinders, tubes, or passages
connected to the casing, and let into openings formed in the right and left sides of
the vessel at a suitable inclination. If by means of a valve the water is prevented
from flowing through one of the tubes, passages, or channels the vessel will turn or
steer as if worked by the helm or rudder, the bow of the vessel taking a different
direction, thus it is evident that by stopping the inlet of water to either of the
tubes or passages the vessel will turn and the bow will take a right or left direction,
according to the side on which the tube is left open, exactly as if the direction of
the ship was governed by her helm or rudder; and by this improved arrangement
the screw propeller worked in a chamber or casing serves to steer the ship in place
of the helm or rudder.
Great advantages are obtained by these improvements, for the screw propeller
being placed inside of the ship is out of sight and out of danger of being damaged.
When placed at the stern the screw propeller may come in contact and be damaged
in passing through sluices, and in open sea a wave or cannon shot may disable the
propeller, such dangers being avoided by this improved arrangement and applica-
tion of the screw propeller.
The Drawings hereto annexed represent a vessel having the screw placed or
arranged in accordance with this Invention.
Figure 1 shows an elevation or longitudinal section of the back part of a vessel
arranged with a screw propeller in accordance with this Invention; Figure 2 shows
an end view of the same; Figure 3 shows a plan of the same.
In all these Figures the same letters refer to the same parts.
Two
A represents part of the ship or vessel; the screw B is fixed at the end of the
axle C; the cylindrical casing in which the screw revolves is shown at the stern of
the ship by D; the two inlet tubes in front of the screw are shown by E, E.
valves F, F, placed at the entrance to the tubes or passages E serve to regulate or
intercept the inlet of water. These valves are worked from the deck of the ship,
the same as the wheel of an ordinary helm or rudder. G shows the steam engine
or other motive power. The two tubes or passages E, E, being open the vessel is
propelled in a straight line or turns by closing either one or the other of the inlets
of the tubes. By closing the two inlets at the same time the speed of the vessel is
slackened.
These improvements may be applied to any kind of ship or vessel, and in order
to obtain greater speed the casing and tubes may be of any form or dimensions, and
by a regulated supply of water to the screw the speed or course of the ship may be
varied.
According to the tonnage of the ship or vessel two, three, or more screw pro-
pellers may be added, not only at the stern of the ship or vessel, as previously
described, but in any other part as may be found most convenient.
Having thus described the nature of the Invention and the manner of performing
or carrying the saine into practice, what I claim under the above in part recited
Letters Patent is, the improved arrangement and application of a chamber or casing
of suitable form and dimensions entirely surrounding the screw propeller, and con-
nected with two openings formed in the right and left sides of the ship or vessel
in order that a large supply of water may be constantly supplied to the screw pro-
peller, and by means of valves or otherwise regulate the supply of water from the
front to the back of the screw propeller, and thereby govern the speed or course
of the ship or vessel as required, substantially in the manner herein-before described
and represented in the Drawings hereunto annexed.
In witness whereof, I, the said John Garrett Tongue, have hereunto set my
hand and seal, this Twenty-eighth day of March, in the year of our Lord
One thousand eight hundred and seventy-seven.
JOHN GARRETT TONGUE. (L.S.)