Improvements in the Mariner's Compass.
Year: 1893

page_text: Date of Application, 27th Dec., 1893
Complete Specification Left, 27th Sept., 1894-Accepted, 10th Nov., 1894
TROYIQIUNAL OF MOTIVATION.
Improvements in the Mariner's Compass.
I, WILLIAM THOMSON, BARON KELVIN of Largs, Professor of Natural
Philosophy, in the University of Glasgow, Glasgow, North Britain, do hereby
declare the nature of this invention to be as follows:-
:-
This invention relates to improvements in the elastic suspension for supporting
the compass bowl as described in my previous Specification of Patent No. 8959,
A.D. 1890.
In carrying out my invention I use the two tubes, one in the fore part of the
binnacle and the other in the after part, and also the weighted tubes supported on
spiral springs, but in order to make the suspension more elastic and to give greater
freedom to the bowl I use a spiral spring instead of the solid hangers for the
connection between the weighted tubes and the bowl.
Dated this 26th day of December 1893
BOTTOMLEY & LIDDLE,
154, St. Vincent Street, Glasgow, Applicant's Agents.
I, WILLIAM THOMSON, BARON KELVIN of Largs, Professor of Natural
Philosophy in the University of Glasgow, Glasgow, North Britain, do hereby
declare the nature of this invention and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement:-
My invention relates to improvements in the elastic suspension for supporting
the compass bowl as described in my previous Specification of Patent No. 8959,
A.D. 1890.
In carrying out my invention I use the two tubes, one in the fore part of the
binnacle, and the other in the after part, and also the weighted tubes supported on
spiral springs, but in order to make the suspension more elastic and to give greater
freedom to the bowl I use a spiral spring instead of the solid hangers for the
connection between the weighted tubes and the bowl.
In order that my invention may be properly understood and readily carried into
effect I have hereunto appended an explanatory sheet of drawings in both figures
of which corresponding parts are marked with the same letters of reference.
Figure represents the binnacle with the brass rim in section to show the
compass bowl.
Figure 2 is au enlarged view of one of the spring suspenders.
AA are the two tubes, one in the fore part of the binnacle, and the other in
the after part. B B are the weighted tubes supported on spiral springs inside the
tubes A A as described in my previous Specification of Patent No. 8959, A.D. 1890.
CC are two spiral springs for carrying the compass bowl D. The upper ends of
the springs CC are fixed to brass pieces bb attached to the weighted tubes B B.
The lower ends of the springs CC carry the V-shaped pieces c, as shown in
Figure 2, in which the knife-edge journals of the ring of the compass bowl rest.

page_text: Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what I
claim is :-
The elastic suspension for supporting the compass bowl consisting of the spring
hangers in combination with the weighted tubes supported on springs substantially
as described.
Dated this 25th day of September 1894.
BOTTOMLEY & LIDDLE,
154, St. Vincent Street, Glasgow, Applicant's Agents.