Improved Method of Finding or Pricking off a Ship's Course on the Chart.
Year: 1891

page_text: Date of Application, 20th Apr., 1891
Complete Specification Left, 13th Jan., 1892-Accented, 20th Feb., 1892
PROVISIONAL SPECIFICATION
Improved Method of Finding or Pricking off a Ship's Course on the
Chart.
I, RAYMOND HOLDSWORTH, of No. 71 De Grey Street, Mariner (Chief Officer)
of Hull, in the County of York do hereby declare the nature of my invention for
"IMPROVED METHOD OF FINDING, OR PRICKING OFF A SHIP'S COURSE ON
THE CHART' to be as follows:-
I employ an instrument consisting of two laths or legs, jointed together like a
pair of compasses or dividers, or like a carpenter's rule.
The card of a mariner's compass revolves on the centre pin of the joint, which
is elongated for that purpose.
The instrument is used as follows:-
The edge of either leg is so placed as to connect or intersect the actual position
of ship on chart, and the desired position.
The other leg is then moved round to the most convenient compass on chart; the
course cut by the inner edge of that leg is read off, and the compass card which
revolves on the joint of the instrument, is set to that course by the same edge of
the same leg.
The course on the revolving card which is then cut by the inner edge of the
first named leg, is the course to steer.
If desired, the legs may be so jointed as to be folded up for convenience of
carriage.
Dated this Dishonoush d
C A: 1001
COMPLETE SPECIFICATION.
Improved Method of Finding or Pricking off a Ship's Course on the
Chart.
I RAYMOND HOLDSWORTH of No. 71 De Grey Street, Mariner (Chief Officer)
of Hull, in the County of York 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:-
I employ an instrument consisting of two laths or legs jointed together like a
pair of compasses or dividers or like a carpenter's rule.
The card of a mariner's compass marked with the ordinary points or with points
and degrees revolves on the centre pin of the joint which is elongated for that
purpose, and which may also be used for mounting a screw for fixing the card in
any position.
The instrument is used as follows:-
The edge of either leg is so placed as to connect or intersect the actual position
of ship on chart, and the desired position.
The other leg is then moved round to the most convenient compass on chart, the
course cut by the inner edge of that leg is read off, and the compass card which
revolves on the joint of the instrument, is set to that course by the same edge of
the same leg.
The course on the revolving card which is then cut by the inner edge of the first-
named leg, is the course to steer.
Example; as shown by accompanying drawings
A. is leg of rule placed from position to po-ition,

page_text: B. the other leg of rule cutting through compass on chart (true) the inner edge
of which shews W. N.
C. represents actual position of ship.
D. represents desired position.
E the revolving card, which is set W. N. by the same edge of the same leg.
The inner edge of the leg A then cuts S. W. which is the course to steer.
If desired, the legs may be so jointed as to be folded up for the convenience of
carriage.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what 1
claim is
1) The combination of a couple of laths or legs jointed together, like, or similar
to a pair of compasses, or a carpenter's rule.
2) A mariner's compass card (marked with the ordinary points, or with points
and degrees) which revolves on the joint connecting the two laths or legs.
Dated this Twelfth day January 1892.
RAYMOND HOLDSWORTH.