AN IMPROVED APPARATUS FOR TRANSMITTING POWER
Year: 1867

page_text: LETTERS PATENT to Thomas Charles Entwistle, Engineer, of New York,
in the United States of America, for the Invention of "AN IMPROVED
APPARATUS FOR TRANSMITTING POWER."
Sealed the 30th April 1867, and dated the 30th January 1867.
PROVISIONAL SPECIFICATION left by the said Thomas Charles Entwistle
at the Office of the Commissioners of Patents, with his Petition, on the
. 30th January 1867.
I, THOMAS CHARLES ENTWISTLE, Engineer, of New York,. in the United
States of America, do hereby declare the nature of the said Invention for
"AN IMPROVED APPARATUS FOR TRANSMITTING POWER," to be as follows:-
The said Invention relates to an arrangement of gearing for increasing or
diminishing rotary motion, and consists in a novel combination and arrange-
ment of three bevel wheels, two of which have a common axis, while the axis
of the third is radial to and revolves around the first-named axis.
In applying the said Invention to a steering apparatus to transmit the
motion from the steering wheel to the drum, and at the same time increase
the speed of the said drum, the horizontal shaft of the said apparatus is sup-
ported in suitable bearings in such a manner as to prevent its turning; the

page_text: chain drum and also the steering wheel (which is firmly secured to the hollow
journal of a revolving yoke) are made to turn freely on the said stationary
shaft. One of the three bevel wheels is made fast upon the said shaft, another
of--the said wheels being firmly secured to the chain drum; the third bevel
wheel is fitted to turn freely on an axle which is secured to the revolving
yoke and gears with the two wheels on the stationary shaft and chain drum.
When the steering wheel is moved it carries with it the yoke and its wheel;
the latter being in gear with the stationary wheel is caused to rotate at the
same time upon its own axis, and thereby imparts a rotary motion to the
wheel on the chain drum in the proportion of two to one.
This Invention may also be advantageously applied to driving screw
propellers when it is desired that the propellor should have a higher velocity
than the shaft of the engine.
In applying the said Invention to the reduction of speed the power must be
applied on the side of the chain drum. The size of the three wheels may be
varied, and the motion transmitted will thereby be increased or diminished in
velocity according to the relative proportion of the said three wheels.
SPECIFICATION in pursuance of the conditions of the. Letters Patent, filed
by the said Thomas Charles Entwistle in the Great Seal Patent Office
on the 25th July 1867.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, THOMAS
CHARLES ENTWISTLE, Engineer, of New York, in the United States of America,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Thirtieth day of January, in the year of our Lord
One thousand eight hundred and sixty-seven, in the thirtieth year. of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me; the
said Thomas Charles Entwistle, Her special licence that I, the said: Thomas
Charles Entwistle; my exécutors, administrators, and assigns, or such others.
as I, the said Thomas Charles Entwistle, my executors, administrators, and
assigns, should at any time agree with, and no others, from time to time
and at all times thereafter during the term therein expressed, should and
lawfully might make, use, exercise, and vend, within the United Kingdom.
of Great Britain and Ireland, the Channel Islands, and Isle of Man, an
Invention for "AN IMPROVED APPARATUS FOR TRANSMITTING POWER," upon the

page_text: condition (amongst others) that I, the said Thomas Charles Entwistle, my
executors or administrators, by an instrument in writing under my, or their,
or one of their hands and seals, should particularly describe and ascertain
the nature of the said Invention, and in what manner the same was to be
performed, and cause the same to be filed in the Great Seal Patent Office
within six calendar months next and immediately after the date of the said
Letters Patent.
NOW KNOW YE, that I, the said Thomas Charles Entwistle, do hereby
declare the nature of my said Invention, and in what manner the same is
to be performed, to be particularly described and ascertained in and by the
following statement:
The object of my Invention is to obtain a very compact arrangement of
gearing for increasing or diminishing the speed of rotary motion, and to this
end it consists in a novel combination and arrangement of three bevel gears,
two of which have a common axis, and the axis of the third is radial to and
revolves around the first-named axis.
In order that my said Invention may be fully understood I shall now
proceed more particularly to describe the same, and for that purpose I shall
refer to the illustrative Sheet of Drawings hereunto annexed, and to the
numeral figures and letters of reference marked thereon respectively, as
follows:-
Figure I. is a plan view of my Invention as applied to a steering apparatus ;
Figure II. is a longitudinal section of the same.
In the accompanying Drawings, A, A¹, are two upright standards, such as
are commonly used for supporting the wheel shaft of a steering apparatus;
B is a horizontal shaft supported in the standards in the position commonly
occupied by the wheel shaft, and prevented from turning by being keyed or
otherwise firmly secured in the standard A¹. The drum H is fitted to turn
freely on the shaft B, and the steering wheel G is secured firmly to the hollow
journalf of a revolving yoke F, which is fitted to turn freely on the shaft B,
the said journal working in a bearing in the standard A. C, D, E, are three
bevel gears; the wheel C is made fast upon the shaft B, and is consequently
stationary; the wheel E is firmly secured to the drum H; and the wheel D. is
fitted to turn freely on a pin or axle d secured to the revolving yoke F, and
occupying a position perpendicular and radial to the shaft, and gears with both
the wheels C and E.
The three wheels are represented of uniform size and operate as follows:-
When the wheel G is made to rotate on the shaft B it carries with it the

page_text: yoke F and gear D, and as the latter revolves, engaged with the stationary
gear C, it is caused to rotade upon its pin or axle d, and thereby to give' rotary
motion to the gear E and the drum K at the raté of two revolutions of the
said gear and drum to one of the wheels G and yoke. This double revolution
is produced owing to the gear D being made to operate as a lever of the third
order, the fulcrum of which is at the pitch line of the gear C, the power being
applied at d, and the weight at the pitch line of the gear E; the power, being
equidistant between the fulcrum and the weight the weight moves twice as
fast as the power.
The same combination and arrangement of gearing may be used for a great
variety of purposes. It is applicable with especial advantage and on account
of its compactness to driving screw-propellers at a higher speed than the.
engine, the yoke F with its axle d for the gear D being in such case attached
-to the engine shaft, and the gear E being secured to the propeller shaft.
Instead of using a yoke F as described in the above arrangement a T-piece,
to which the pin or axle d for the gear D is attached, may be fastened to the
shaft B as well as the wheel G, the gear C being in that case firmly secured
"and made stationary on the standard A, and that part of the shaft B to which
the T-piece and the wheel G is attached must be arranged so as to turn
around in the standard:
In applying the Invention to the reduction of speed the power would be
applied to the gear E, which by its rotary motion would cause .the gear D
both to rotate on its axle d and to creep around the stationary gear C, and
thereby give rotary motion to the yoke F or to its supporting T-piece, and to
any attached shaft, at the rate of half a revolution for every revolution of the
gear E. In this operation the gear D operates as a lever of the second order,
"the fulcrum of which is at the pitch line of the gear C, the power being
applied at the point of contact of the gear E, and the weight being at d; the
weight being equidistant between the fulcrum and the power only moves, balf
as fast as the power.
It must not be understood that the sizes of the three
gears are required to be uniform; the sizes may be varied, and the movement
transmitted will be increased or diminished in velocity according to the relative
size of the gears C and E. If the gears C and E are not of uniform size the
axle d will require to be set obliquely to the shaft B instead of perpendicularly,
as represented.
Having now described the nature of my Invention, and the manner in
which the same is or may be used or carried into effect, I hereby declare that
I claim as my Invention, and desire to secure by Letters Patent, the com-

page_text: bination and arrangement of three bevel gears C, D, E, and a revolving
T-piece or yoke F, or its equivalent, to operate substantially as herein set forth
and specified.
In witness whereof, I, Thomas Charles Entwistle, have hereunto set
my hand and seal, this Twenty-fourth day of June, in the year of our
Lord One thousand eight hundred and sixty-seven.
THOMAS CHARLES ENTWISTLE. (L.S.)