Year: 1888

page_text: Date of Application, 24th May, 1888
Complete Specification Left, 21st Feb., 1889
Complete Specification Accepted, 23rd Mar., 1889
1, QUINTIN PRINGLE, Headmaster of Bishop Street, Public School, Glasgow, in the
County of Lanark, do hereby declare the nature of this Invention to be as follows:-
This Invention has for its object the provision of improved means for facilitating
the teaching of elementary arithmetic in schools and classes and the improved
apparatus constituting the Invention comprises a number of prisms or prismatic
blocks on each of whose faces is printed or otherwise displayed a row of numerals.
The prisms are carried upon shelves in a framing, or upon spindles, in such wise that
any one of the faces of each prism may be presented to view and they are made
The front faces
interchangable and bave a different order of numerals on each face.
of the prisms, which may be placed either horizontally or vertically in the frame, are
in the same plane, and whilst any one order or arrangement of the prisms presents
to view a sum for addition, subtraction, multiplication or division a fresh sum may be
presented by changing one or more of the prisms or faces of the prisms or by
covering part of one or more of the rows of numerals by means of slides or like
devices with which the apparatus may be provided.
The apparatus may be made portable or adapted for attachment to an ordinary
blackboard.
m
1
1000
CRUIKSHANK & FAIRWEATHER,
62, Saint Vincent Street, Glasgow,
Agents.

page_text: COMPLETE SPECIFICATION,
Improved Apparatus for Use in Teaching Arithmetic.
I, QUINTIN PRINGLE, Headmaster of Bishop Street Public School, Glasgow, in the
County of Lanark, 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 has for its object the provision of improved means for facilitating the
teaching of elementary arithmetic. in schools and classes and as represented in the
accompanying drawings in front and side elevations at figures 1 and 2 and in vertical
section at figure 3 the improvod apparatus constituting the Invention comprises. a
number of prisms or prismatic blocks A on each of whose faces is printed or other-
wise displayed a row of numerals. The prisms are carried upon shelves B in a
framing C, or upon spindles, in such wise that any one of the faces-of-each-prism may
be presented to view and they are made interchangable and have a different order
of numerals on each face. The front faces of the prisms A which may be placed
either horizontally or vertically in the frame Care in the same plane, and whilst any
one order or arrangement of the prisms presents to view a sum for addition, subtrac-
tion, multiplication or division a fresh suim may be presented by changing one or more
of the prisins or faces of the prisms or by covering part of one or more of the rows of
numerals by means of slides D or like devices with which the apparatus is or may be
provided.
The apparatus may be made portable or adapted for attachment to an ordinary
blackboard.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, 1 declare that what I
claim is :-
The improved apparatus hereinbefore described for use in teaching arithmetic.