An Improved Ruler.
Year: 1893

page_text: Date of Application, 15th Feb., 1893
Complete Specification Left, 17th Aug., 1893-Accepted, 23rd Sept., 1893
PROVISIONAL SPECIFICATION.
An Improved Ruler.
GEORGE FIELDING WHITMORE Dart Bank Kingswear Devon Retired Navi-
gating Lieutenant of the Royal Navy, do hereby declare the nature of this invention.
to be as follows:-
-
My improved ruler has the advantages of both the round ruler and flat rule, as
also that of the ordinary rolling rule. It is constructed entirely of metal and
consists of a round metal tube, having at both ends brackets, forming bearings for
a bar which passes through it longitudinally and forms its axis.
This bar projects at each end of the tube sufficiently to form pivot pins for two
loops or straps, each of which is connected at its outer end to the end of a straight
bar, rather longer than the roller tube.
The ends of the pivot pins are fitted with screws washers or transverse pins to
keep the loops in place.
The straight bar forms the flat ruler, and can be graduated on one side to
sixteenths of an inch and on the other side to tenths of an inch, or in any way
preferred.
My improved ruler can be used as an ordinary round ruler, and having the flat
ruler attached, it also serves as a parallel ruler. It is especially suitable for chart
work in navigation.
The bar and loops work smoothly but not loosely on their bearings. The ruler
can be made in various sizes.
Dated this 8th dow of Tunn 100
S. S. BROMHEAD,
97, Newgate Street, E.C., Agent for Applicant.
COMPLETE
SPECIFICATION.
An Improved Ruler.
I, GEORGE FIELDING WHITMORE of Dart Bank, Kingswear, Devon, Retired
Navigating Lieutenant R.N. 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 :-
This invention relates to rulers for draughtsmen and students, and is especially
designed for such as need to use both the round and flat ruler in their work.
It consists of a round and flat ruler combined in one instrument, being connected
together by link-plates at their ends in such a way that the round ruler revolves
readily on a longitudinal axis, and each ruler serves to steady and assist the other
to perform its function.
The round ruler consists of a metal tube having at both ends caps or brackets
forming bearings for a bar which passes through it lengthways, and forms its axis.
This bar projects sufficiently at each end of the round ruler to form pivot pins
for two links or loops, each of which is connected at its outer end to the straight
bar which forms the flat ruler.
The ends of the pivot pins are fitted with transverse pins washers or screw nuts,.
or other suitable device for keeping the loops in place.
I will now describe the invention with reference to the accompanying drawings.
in which
Fig. 1 shows a plan view of the invention.

page_text: Fig. 2 shows an enlarged end view of the same.
a is the round ruler.
b is the rod which passes lengthways through a.
c, c, are the bearings. for b.
d, d, are links or loops connecting the two rulers.
e is the flat ruler.
f, f, are forked ends forming clips which can be used to support e.
99, are lynch pins to secure d d and b.
The straight bar forming the flat ruler can be graduated on one side to sixteenths
of an inch, and on the other to tenths of an inch, or in any way preferred.
My improved ruler combines all the advantages of the round and flat ruler, and
will also serve as a parallel ruler. It is especially suited for chart work in
navigation.
The rod and loops should work smoothly but not too loosely on their bearings.
The ruler can be made in various sizes.
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 I
claim is:
(1.) The combination of a hollow round ruler and a flat ruler, the two being
connected by links or loops, and the former rotating on a longitudinal axis, as
herein described and set forth.
Dated this 17th of August 1893
S. S. BROMHEAD,
97, Newgate Street, E.C., Patent Agent.