IMPROVEMENTS IN APPARATUS FOR COPYING DRAWINGS, &C
Year: 1878

page_text: LETTERS PATENT to Lewis Wolff, of No. 55, Great Queen Street, Lincoln's Inn
Fields, in the County of Middlesex, for the Invention of "IMPROVEMENTS IN
APPARATUS FOR COPYING DRAWINGS, &C."
Sealed the 30th May 1879, and dated the 2nd December 1878.
PROVISIONAL SPECIFICATION left by the said Lewis Wolff at the Office
of the Commissioners of Patents on the 2nd December 1878.
LEWIS WOLFF, of No. 55, Great Queen Street, Lincoln's Inn Fields, in the County
of Middlesex. "IMPROVEMENTS IN APPARATUS FOR COPYING DRAWINGS, &C."
My Invention relates to improvements in the construction of a well known
drawing apparatus, consisting of a sheet of glass held in an upright position across
the centre of a wooden board for the purpose of enabling objects to be copied by
tracing the reflection as in the ordinary camera lucida. In the apparatus as hitherto
used the sheet of glass is held in position by means of two sticks of grooved wood
placed into holes in the board, the glass sliding into the grooves. Now my Invention
consists in the attachment of the glass to the board by means of a hinge of calico
or any other suitable material, so that the base of the sheet of glass is always retained
across the centre of the board, it being only necessary to raise the upper edge of
the glass until it forms a right angle with the board. The glass may be retained
in its upright position by means of a cord or band of fabric (elastic or otherwise)
stretched from the upper edge of the glass on each side to the opposite corners of
the board, wires can also be used for the same purpose.
The attachment of the glass by means of the hinge allows also an improved
portable form of the whole apparatus to be made. Two pieces of wood or card-
board slightly larger than the glass are bound together by the edges, the glass being
hinged in at the join. This will give the apparatus the form of a book, and if the
Paine Ad

page_text: cords or bands before mentioned be permanently attached to the glass, and also to
the ends of the boards or covers, the act of opening the apparatus will bring the
glass into its upright position without any trouble.
Having described the nature of my Invention, I wish it to be understood that it
relates only to improvements upon the construction of an old apparatus as substan- 5
tially set forth, my claim being,―
1. The attachment of the glass to the wood by means of a hinge.
2. The holding of the glass in an upright position by means of cords.
3. A folding portable apparatus, the opening of which raises the glass into its
upright position.
1

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Lewis Wolff in the Great Seal Patent Office on the 30th May
1879.
LEWIS WOLFF, of No. 55, Great Queen Street, Lincoln's Inn Fields, in the County
of Middlesex. "IMPROVEMENTS IN APPARATUS FOR COPYING DRAWINGS, &C."
My Invention relates to improvements in the construction of a well known
drawing apparatus, consisting of a sheet of glass held in an upright position across
the centre of a wooden board for the purpose of enabling objects or drawings to be
copied by tracing the reflection as in the ordinary camera lucida.
In the apparatus as hitherto used the sheet of glass is held in position by means
of two sticks of grooved wood placed into holes in the board, the glass sliding into
the grooves. Now my Invention consists in the attachment of the glass to the
board by means of a hinge of calico or any other suitable material, so that the base
of the sheet of glass is always retained across the centre of the board, being only
necessary to raise the upper edge of the glass until it forms a right angle with the
board. The glass may be retained in its upright position by means of a cord or
band of fabric, elastic or otherwise, stretched from the upper edge of the glass on
each side to the opposite corners of the board; wires can also be used for the same
purpose. The attachment of the glass by means of the hinge allows also an
improved portable form of the apparatus to be made. Two pieces of wood or card-
board, slightly larger than the glass, are bound together by the edges, the glass being
hinged in at the joint. This will give the apparatus the form of a book, and if the
cords or bands before mentioned be permanently attached to the glass, and also to
the ends of the boards or covers, the act of opening the apparatus will bring the
glass into its upright position without any trouble. If it be desired to construct
the apparatus so that a new glass can be easily inserted I fasten a grooved piece of
metal or wood by means of a hinge to the board or pair of covers before described,
the grooves in the said piece of metal or wood being of suitable dimensions to hold
the glass.
Having described the nature of my Invention, I wish it to be understood that it
relates only to improvements in the construction of an old apparatus as substan-
tially set forth, and I claim and desire to be secured to me by the herein before in
part recited Letters Patent,-
1. The attachment of the glass to the wood by means of a hinge.
2. The holding of the glass in an upright position by means of cords.
3. A folding portable apparatus, the opening of which raises the glass into its
upright position.
In witness whereof, I, the said Lewis Wolff, have hereunto set my hand
and seal, this Twenty sixth day of May, in the year of our Lord
LEWIS WOLFF. (L.S.)