Novel Construction of Geometrical Models for Educational Purposes.
Year: 1892

page_text: ate of Application, 25th Nov., 1892-Accepted, 31st Dec., 1892
COMPLETE SPECIFICATION.
Novel Construction of Geometrical Models for Educational
Purposes.
I, GEORGE REGINALD GILL Wavertree, Loats Road Clapham London S.W.,
Educational Publisher 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 consists in a novel construction of models, to allow of the facile
demonstration of the figures or formations arising when various geometrical solids
such as cylinders, cones, and so forth are cut at various angles or planes; and, in
order, that my invention may the better be understood, "I have appended the
accompanying sheet of illustrative drawings.
or
In carrying out my invention, I employ hollow models of the several geometrical
solids made of any suitable substance such as papier maché, carton pierre, thin
wood or other light material. These models have detachable portions cut at any
desired angle or plane and which may for the purposes of instruction
demonstration by the means hereunder described be readily removed and replaced.
That is to say, taking the case of a cylinder. Figure is a horizontal section
taken on line a, b, of the vertical view, Figure 2. In making up the model a
portion B is removed from the main portion A of the cylinder and to the part C
thereof I adapt circular washers D perforated in centre as shewn at d. To the
portion B, I secure small base or bearing pieces upon which are mounted the
studs E. Now, as will be seen on reference to the drawing the head of the stud E
is of larger diameter than that of the washers D-it will be obvious therefore that
on introducing the head of the stud E through d, the two portions A and B will be
held securely in position as shewn at Figure 1, the washers being also provided with
fine cuts or slits to facilitate the entry and withdrawal of the studs and to avoid
undue strain upon the washer.
Figures 3, 4 and 5 are detached views of the removable and replaceable
portion B, Figure 3 being a front vertical elevational view of the portion B' of B.
Figure 4 is a vertical sectional view taken through the point of attachment of the
two portions A and B. Figure 5 is a detached horizontal sectional view of the
removeable and replaceable portion of B.
Figures, 6, 7 and 8 are appended merely to illustrate the application of my
invention to geometrical figures of various formations or configurations and will be
self explanatory after the preceding description in reference to Figures 1, 2, 3,
4 and 5. It is only necessary to add that the mode of attaching the small base or
bearing pieces e will vary according to the configuration of the particular
geometrical figure employed.
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 :
The improved means substantially as herein described to allow of the facile
demonstration of the figures or formations arising when geometrical solids are
cut at various angles or planes.
Dated 1:00-13
CAL
1
1000
JAMES STEVENSON,
Gray's Inn Chambers, 20, High Holborn, London, W.C., Agent for Applicant.