Improved Means applicable for Use in the Production of Photo-prints.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improved Means applicable for Use in the Production of Photo-prints.
We, LEONARD SILAW, of 39, Victoria Street, in the City of Westminster,
Mechanical Draughtsman, and JOSEPH HALDEN, of 8, Albert Square, Manchester,
in the County of Lancaster, Stationer, do hereby declare the nature of this
invention to be as follows:-
This invention relates to an improved construction of apparatus designed to
facilitate the expeditious and economical reproduction of drawings and the like
with the aid of artificial light.
Apparatus constructed according to our improved method and adapted for
the purpose referred to comprises two semi- or approximately semi-cylinders,
composed of glass or other suitable transparent material. These two semi-
cylindrical surfaces or tables are arranged, with their concave sides towards
one another, either concentrically or with their centres moved somewhat apart.
The opposite extremities of the tables are respectively mounted in discs suitably
grooved for their reception; the grooves being by preference lined with caoutchouc
or other yielding packing, and affording moreover freedom for the expansion
and contraction of the glass tables. The two discs in which the opposite extremi-
ties of the tables are carried are connected together by means of bars or tubes,
arranged in pairs, or by other suitable connecting pieces; the bars or connecting
pieces being arranged on either side between or opposite the gaps between tho
longitudinal edges of the tables. The bars or connecting pieces are respectively
provided, midway of their length, with trunnions; the latter being carried in
bearings mounted on two side-frames. The discs in which the tables are carried
are respectively formed with large central openings, adapted to admit an electric
are lamp or other instrument for the production of artificial light.
Assuming that a drawing prepared on tracing paper is to be reproduced by
the ferro-prussiate or like photographic process, and regarding the pair of tables
when mounted as before described as constituting a single cylinder, the tracing
is first laid upon the upper surface of the cylinder, upon the tracing is placed
the sensitised paper, and these are then covered with a canvas or other apron,
which may be secured at intervals to one of the longitudinal bars or connecting
pieces which extend between the end-discs. The cylinder is then turned on its
transverse axis; and its opposite side, which is now uppermost, may be utilised
in the same manner for the reception of another tracing or other transparent
original to be copied. This, together with its sensitised paper, having in like
manner been covered by an apron and secured, the cylinder is now turned so
as to assume a vertical position, and an electric arc lamp or other source of
artificial light is introduced through the opening in the upper or in the lower
disc. The lamp may be raised or lowered, according to the requirements of

page_text: the work in course of reproduction; or two or more lamps may be employed,
either at the same or at different levels.
Dated the 3rd day of March 1899
COMPLETE SPECIFICATION.
Improved Means applicable for Use in the Production of Photo-prints.
We, LEONARD SHAW, of 39, Victoria Street, in the City of Westminster,
Mechanical Draughtsman, and JOSEPH HALDEN, of 8, Albert Square, Manchester,
in the County of Lancaster, Stationer, 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:-
r
This invention relates to an improved construction of apparatus designed to
facilitate the expeditious and economical reproduction of drawings and the like
with the aid of artificial light.
Apparatus constructed according to our improved method and adapted for the
purpose referred to is illustrated in the accompanying drawings, whereof Fig.
is a view half in elevation and half in longitudinal section the apparatus being
shown in the position it occupies during the application of the sensitised paper
and the original previous to reproducing the latter upon the former. Fig. 2 is
a view partly in end elevation and partly in transverse section corresponding
with Fig. 1. Fig. 3 is a view illustrating the general working of the apparatus;
the cylinder being turned into position for receiving the source of artificial
light. Figs. 4 and 5 are detached views of means which may be employed for
securing the canvas covering or apron.
The apparatus comprises two semi or approximately semi-cylinders A A
composed of glass or other suitable transparent material; the two semi-cylindrical
surfaces or tables being arranged with their concave sides towards one another
either concentrically as shown, or with their centres moved somewhat apart.
The opposite extremities of the tables are respectively mounted in discs B B
suitably grooved for their reception; the grooves being by preference lined
with caoutchouc 6 6 or other yielding packing, and affording moreover freedom
for expansion and contraction of the glass tables. Adjustable blocks which
bear upon the convex sides of the tables serve to preserve the semi-cylindrical
surfaces from displacement in a radial direction. The discs B B in which the
opposite extremities of the tables A A are carried are connected together by
means of bars or tubes C C arranged in pairs on either side between or opposite
the gaps between the longitudinal edges of the tables. Or other suitable
connecting pieces similarly arranged may be employed. The bars or connecting
pieces are respectively provided, midway of their length, with trunnions D) D:
the latter being carried in bearings E E mounted on two side frames F F. One
of the trunnions is furnished with a plate D' through one or another of the perfo-
rations in which latter a pin or stop D2 may be passed and inserted in a hole
in the framing when it is desired to maintain the apparatus in a vertical or
horizontal attitude. The discs B B in which the tables are carried are respec-
tively formed with large central openings adapted to admit an electric arc lamp G
or other instrument for the production of artificial light.
Assuming that a drawing prepared on tracing paper is to be reproduced by
the ferro-prussiate or like photographic process, and regarding the pair of
tables A A when mounted as before described as constituting a single cylinder,

page_text: the tracing is first laid upon the upper surface of the cylinder, upon the tracing
is placed the sensitised paper and these are then covered with a canvas or other
apron A which may be secured at intervals to one of the longitudinal bars C
or other connecting pieces which extend between the end discs B. The cylinder
is then turned on its transverse axis D, and its opposite side, which is now
uppermost, may be utilised in the same manner for the reception of another
tracing or other transparent original to be copied. This together with its sensi-
tised paper having in like manner been covered by an apron and secured, the
cylinder is now turned so as to assume a vertical position, and an electric are
lamp, such as G, or other source of artificial light is introduced through the
opening in the upper or in the lower disc B. The lamp may be raised or lowered,
according to the requirements of the work in course of reproduction and may also
be rotated; or two or more lamps may be employed, either at the same or at
different levels. In the drawing a single lamp G is shown connected by means
of a cord with a counter-weight g
The canvas apron A is preferably made in sections whereof the edges trans-
verse to the cylinder or tables overlap. The longitudinal edges of each section
are formed for the reception of rods a which may be seen at the notches or
openings. For securing these edges to the bars C extensible or spring books H,
such as shown detached in Figs. 4 and 5 may be employed. The hooks may be
carried by the bar nearest to the edge to be secured or they may be carried by
the bar remote therefrom. In the latter case they would require to be somewhat
extended in form to permit of their being elongated so as to meet the rod
pertaining to the edge of the apron. The hook-ring at one end of each hook
while the hook at the opposite end is
is arranged to fit freely on the bar
arranged to readily engage with the rod a.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we claim :-
1. The herein described apparatus for use in the production of photo-prints
with the aid of artificial light; same comprising a drum formed of transparent
material, mounted on trunnions, so as to be rotateable about its transverse axis,
and adapted for the reception of a lamp or other source of light internally, whilst
the drawing to be reproduced and the sensitive paper are secured about its
exterior surface.
2. In apparatus for use in the production of photo-prints with the aid of
artificial light, the employment of a drum consisting of two annular end-plates
connected together by means of bars arranged on either side, the end-plates
supporting between them two approximately semi-cylindrical tables formed of
transparent material, such as glass, the whole being mounted to rotate on
trunnions attached to the aforesaid connecting bars, substantially as herein
described.
3. In apparatus for use in the production of photo-prints with the aid of
artificial light, the combination of the printing cylinder A A, the cover or
apron A, the bars CC, and the spring hooks H H, substantially as and for the
purposes specified.
4. In apparatus for use in the production of photo-prints with the aid of
artificial light, the combination, with the printing cylinder A A, of the end-
plates or discs B B, having grooves lined with caoutchouc or other yielding
packing, and the connecting bars CC. substantially as set forth.
Dated this 28th day of October 1899.
d this 28th day of October 1899.
For the Applicants,
G. G. M. HARDINGHAM,
Chartered Patent Agent,
Clun House, Surrey Street, London, W.C.