A New or Improved Transparent Drawing Plate or Tester.
Year: 1896

page_text: Date of Application, 10th Mar., 1896-Accepted, 2nd May, 1896
COMPLETE SPECIFICATION.
A New or Improved Transparent Drawing Plate or Tester.
1 GEORGE DAVIS, of Myrtle View, Yew Tree Road, Kidderminster, in the
County of Worcester, 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:-
This invention relates to a new or improved device or drawing plate and tester,
and refers more particularly to a device whereon drawing copies may be made,
either from being imitated upon paper or slates &c., and then testing such
imitations by being laid thereon; when the imitation is visible and may be
compared, as to accuracy &c., with the original; or it may be used whereon some
other original such as a map for instance may be traced in order similarly to test
the student's work.
In order to make my invention more clear I have appended hereunto an
illustrative drawing to which reference is herein made.
Figure 1, is a view of the device.
The plate 3, is of any suitable size and is made of glass, celluloid or other
transparent material. The surface upon one or both sides is roughened or other-
wise prepared so that a drawing or other figure or writing may be made thereon.
Around and along its edges are marked any desired scales or divisions 4, so that
lines such as 5, may be drawn across from the markings on the one side to their
corresponding markings on the other (opposite) edge, and thus form squares or
other spaces or divisions.
Such scales may be made upon both sides of the plate, but varying in size of
divisions, as for instance, the one side may be in eighths, but the other side in.
twelveths, or other dissimilar divisions may be adopted, and so the one or the other
may be used as desired.
These lines may be permanently drawn upon the surface-in which case they
would be only so made on the one side-or the surface may be left plain, and the
said lines drawn when and as required.
Its use would therefore be somewhat as follows, although I do not limit myself
to the uses stated :-
If for instance the student has a copy before him having squares of the same
dimensions as those upon the plate and upon which an object such as 6, is drawn
for his imitation upon a sheet of paper &c. having squares of the same size, then
by drawing the same object upon the plate, it may be placed upon the student's
work, which is indicated by the dotted line 7, which will readily discover any
discrepancy made by the student, which may be then pointed out to him.
Or for example, an original drawing may be made upon the plate and then
transferred to a blackboard having lines, say twice the distance apart, which latter
is then used as a copy to the students who are told to reduce it to one half of its
size. In such a case the plate may be readily placed upon the various students'
work, in order to test their correctness. Even should the student be instructed to
reproduce the copy without such squares or lines, when no doubt their drawings
would vary in size, still when the said plate was placed thereon, it would show how
far the student had departed from a parallel following of the lines of the copy..
Other similar uses it may be applied to, and the drawings washed off from time
to time so that fresh ones may be drawn thereon.

page_text: Having now particularly described and ascertained the nature of this my inven-
tion and in what manner the same is to be performed, I declare that what I
claim is ;-
A transparent plate having a writable or drawing surface and having scales or
divisions marked thereon with or without permanent cross lines, substantially as
herein described and shown and for the purposes specified.
Dated this 10th day of March 1896
CHARLES T. POWELL,
12 Cherry Street, Birmingham, Applicant's Agent.