Improved Model for Teaching Solid or Descriptive Geometry.
Year: 1892

page_text: Date of Application, 15th Oct., 1892
Complete Specification Left, 15th July, 1893—Accepted, 19th Aug., 1893
PROVISIONAL SPECIFICATION.
Improved Model for Teaching Solid or Descriptive Geometry.
I, JOHN ALLAN WALKER, of 54 Carnarvon Street Glasgow, North Britain,
Art Master, do hereby declare the nature of this invention to be as follows :—
This invention relates to an improved model for teaching solid or descriptive
geometry and for showing more clearly than can be done at present the projection
of lines and planes.
In the models now used for teaching geometry or perspective the co-ordinate
planes are made of wood, or in some cases of glass. According to my improve-
ments I make the co-ordinate planes of some material which is transparent and
which also can be pierced with wires or planes to show the traces of points or
lines and the projection of planes. For carrying the transparent material I
provide a framework having grooves cut in it. The transparent material slips
into these grooves so that a new piece may at any time be substituted for one
in which too many holes have been pierced.
The model consists of a horizontal plane and a vertical plane above and below
the horizontal plane. The parts of the vertical plane above and below the hori-
zontal plane are hinged so that they may both be folded up against the horizontal
plane.
This
On the framework I provide a stand for the purpose of sustaining the wires
or planes in any required position in front of the co-ordinate planes.
stand can be placed on any part of the framework and fixed there by means
of pins.
Dated this 14th day of October 1892.
BOTTOMLEY & LIDDLE,
154, St. Vincent Street, Glasgow, Applicant's Agents.
COMPLETE SPECIFICATION.
Improved Model for Teaching Solid or Descriptive Geometry.
I, JOHN ALLAN WALKER, of 54 Carnarvon Street, Glasgow, North Britain,
Art Master, 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 relates to an improved model for teaching solid or descriptive
geometry or perspective and for showing more clearly than can be done at present
the projection of lines and planes.
In the models now used for teaching geometry or perspective the co-ordinate
planes are made of wood, or in some cases of glass. According to my improve-
ments I make the co-ordinate planes of some material which is transparent aud
which also can be pierced with wires or planes to show the traces of points or lines
and the projection of planes. For carrying the transparent material 1 provide a
framework having grooves cut in it. The transparent material slips into these
grooves so that a new piece may at any time be substituted for one in which too
many holes have been pierced.
The model consists of a horizontal plane and a vertical plane above and below
the horizontal plane. The parts of the vertical plane above and below the hori-
zontal plane are binged so that they may both be folded up against the horizontal
nlane

page_text: On the framework I provide a stand for the purpose of sustaining the wires or
planes in any required position in front of the co-ordinate planes. This stand can
be placed on any part of the framework and fixed there by means of pins.
In order that my invention may be properly understood and readily carried into
effect I have hereunto appended two explanatory sheets of drawings which I
will now proceed to describe.
Figure 1 is a perspective view of the model.
Figure 2 is a vertical section.
The model consists of a horizontal plane A A, and a vertical plane B B placed
above and below the horizontal plane. The co-ordinate planes are made of some
transparent material which can be easily pierced. I find that gelatine is a suitable
substance. The framework for carrying the transparent material is made of wood,
having grooves into which the transparent material slips. Thus a fresh piece may
at any time be substituted for one in which too many holes have been pierced.
The parts of the vertical plane above and below the horizontal plane are hinged so
that they may both be folded against the horizontal plane. They are held in
position by turn-buttons b. On the framework I provide a stand c with movable
arms c, for holding wires or planes in any required position.
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 improved model for teaching solid or descriptive geometry or perspective,
having the vertical plane above and below the horizontal plane, substantially as
described and illustrated on the accompanying drawings.
2. In models for teaching solid or descriptive geometry or perspective, the use
of transparent material which can be easily pierced, such as gelatine, for the
co-ordinate planes.
Dated this 14th day of July 1893.
BOTTOMLEY & LIDDLE,
154, St. Vincent Street, Glasgow, Applicant's Agents.