An Improved Method of and Means for Testing the Accuracy of Mechanical and Geometrical Drawings.
Year: 1895

page_text: Date of Application, 29th Nov., 1895
Complete Specification Left, 29th Aug., 1896-Accepted, 31st Oct., 1896
PROVISIONAL SPECIFICATION.
An Improved Method of and Means for Testing the Accuracy of
Mechanical and Geometrical Drawings.
We, RICHARD WADDINGTON, of 54 Arkwright Street, Bolton, in the County
of Lancaster, and MARSHALL JAMES JACKMAN, of 121 Milkwood Road, Herne
Hill, in the County of Surrey, Publishers, do hereby declare the nature of this
invention to be as follows:-
This invention relates to an improved method of and means for readily testing
the accuracy of drawings, and more especially for ascertaining the accuracy of the
drawings of pupils in schools and the like, without the necessity for the drawing-
instructor or other person to make elaborate comparisons and measurements in
order to ascertain whether the pupil's drawing is correct.
According to our invention we provide upon sheets of semi-transparent paper or
tracing paper or cloth accurately prepared designs or drawings, which are solutions
of problems intended to be set to pupils.
After the pupil has made his drawing in accordance with the conditions of the
problem the same can be instantly tested by the teacher by simply applying our
test sheet thereto. It can be seen at a glance where and in what way, if any, the
pupil's drawing differs from the correct solution of the problem.
Such test-sheets each having thereon one or more graphic and scale solutions of
geometrical or mechanical drawing problems greatly facilitate the work of a
drawing-instructor in examining his pupils' drawings, and the saving of time thus
effected is very great when there are a large number of pupils.
Dated this 20th dor of Nanombor 1805
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicants.
An Improved Method of and Means for Testing the Accuracy of
Mechanical and Geometrical Drawings.
We, RICHARD WADDINGTON, of 54 Arkwright Street, Bolton in the County
of Lancaster, and MARSHALL JAMES JACKMAN, of 121 Milkwood Road, Herne
Hill, in the County of Surrey, Publishers, 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 an improved method of and means for readily testing
the accuracy of drawings, and more especially for ascertaining the accuracy of the
drawings of pupils in schools and the like without the necessity for the drawing-
instructor or other person to make elaborate comparisons and measurements in
order to ascertain whether the pupil's drawing is correct.
According to our invention we provide upon sheets of semi-transparent paper or
tracing paper or cloth, accurately prepared designs or drawings which are correct
solutions of problems intended to be set to the pupils.

page_text: The accompanying drawing represents a semi-transparent test sheet A containing
by way of example a diagram of an envelope, and an outline of a picture frame,
each being correct solutions of the corresponding problems.
After the pupil has made his drawing in accordance with the conditions of the
problem the same can be instantly tested by the teacher by simply applying our
test sheet thereto.
Supposing that the pupil has been required to draw an envelope from a
dimensioned sketch or problem, it can be seen at a glance if the lines of the
drawing coincide with those of the figure of the test sheet, and in what way, if
any, the drawing differs from it.
Such test sheets, each having thereon one or more graphic and scale solutions of
geometrical or mechanical drawing problems and exercises, greatly facilitate the
work of a drawing-instructor in examining his pupils' drawings, and the saving of
time thus effected is very great when there are many drawings to be examined.
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
A sheet of semi-transparent material bearing the correct solution of a
geometrical or mechanical drawing problem, for use as described, and for the
purpose specified.
Dated this 20th don of At 190
HASELTINE, LAKE & Co.,
45 Southampton Buildings, W.C., Agents for the Applicants.