Year: 1889

page_text: Date of Application, 11th Jan., 1889
Complete Specification Left, 18th Apr., 1889
Complete Specification Accepted, 1st June, 1889
LEWIS HARRY COOKE 81 St. Augustine Road London N.W. Schoolmaster THOMAS
NEWEL LEWIS 81 St. Augustine Road London N.W. Schoolmaster do hereby declare
the nature of this invention to be as follows:-
The apparatus consists of a thin flat ruler A one end of which is attached to, and
insorted within another and thicker ruler B.
The ruler A is capable of being moved round on its attachment to B through an
angle of 180°. The ruler B is so made that the ruler A when moved round either
way to its extreme limit, will be enclosed by the ruler B, wholly as to its width and
partly as to its length, the ruler A being thus longer than the ruler B.
Both surfaces of the ruler B are marked with lines, both above and below the point
of attachment, indicating the positions of the various angles, so that the ruler A may
be swung round and set and fixed to any of these angles.
The two surfaces of the ruler A are divided into inches or feet.
A, A1, A2, A3, A* in the accompanying diagram shows some of the positions of the
ruler A with regard to the ruler B.
ז
1
ALL 1
C T1000
LEWIS HARRY COOKE,
THOMAS NEWEL LEWIS,
Applicants.

page_text: COMPLETE SPECIFICATION.
Improvements in and relating to Rulers.
LEWIS HARRY COOKE, 81 St. Augustine's Road, Camden Square, London N.W.
Schoolmaster, THOMAS NEWEL LEWIS, 81 St. Augustine's Road Camden Square
London N.W. Schoolmaster 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:-
It consists of a thin flat ruler A-which may be bevelled-one end of which is
attached to another hollowed ruler B. The ruler A is capable of being moved round
on its attachment to B through an angle of 180 degrees. The ruler B is so made that
the ruler A when moved round either way to its extreme limit may be enclosed by the
ruler B, wholly as to its width and partly as to its length. Both surfaces and edges
of the rulers are marked both above & below the point of attachment with numbered
lines indicating the positions of the various angles e.g. 45° 60° 90° so that the ruler A
may be swung round, set, and fixed to any of these angles. The ruler A fits the
groove of B so tightly and exactly that this tightness alone will fix and retain
the ruler A at any angle. The two surfaces of the ruler A are divided into inches
and feet and the fractional parts of inches or fect.
The end of the ruler A nearest the point of attachment is marked with lines on both
sides and edges indicating the same angles as marked on B so that when the ruler A
is swung round to any particular angle, the extremities of the lines on A & B are
coincident as at D in the diagram: the line marking the angle on A also coming
exactly under the edge of B.
The other portion of the surfaces of B may be utilized for the marking of geometric
scales & geometric figures.
The ruler A may be attached to B by means of a screw or other device and fixed
in position by a nut, embedded screw, or by tightness alone in addition to the pivot on
which A works.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
(1) That having the angles marked on both sides of the rulers B & A we can make
any angle from either side of the ruler and can work from any side of the ruler on
board or slate.
We claim to make the ruler of wood or any other suitable material.
(3) The angles being marked at a distance to the right of the pivot the greatest
accuracy in making the various angles can be obtained even by children.

page_text: (4) The apparatus being designed primarily for the use of children, it is easily
adjusted, the angles being marked on both A and B, edges as well as sides, and by
means of lines at right angles to the edges of A the relative sizes of the various angles
may be taught.
(5) The ruler A fitting the groove in B so tightly and exactly that this tightness
alone will fix and retain the ruler A at any angle.
(6) The ruler A when pushed to its extreme limit with regard to B forms one long
ruler and is easily portable the edges of A & B being flush with one another.
Dated this 18th day of April 1889.
LEWIS HARRY COOKE.
THOMAS NEWEL LEWIS.