Year: 1898

page_text: Date of Application, 16th Mar., 1898-Accepted, 4th June, 1898

page_text: the
at its lower end with a plate of caoutchouc m, whilst on its upper end is screwed
a nut p. The lower end of the socket forms a shell o which embraces the india-
rubber plate m. The socket slides in another socket provided with a disc q,
and to which it can be fixed by means of a screw s. By turning the nut
indiarubber plate m is raised at its centre, whilst its edge is pressed towards the
uppermost photographic plate, so that a vacuum is formed between the indiarubber
plate and the photographic sensitive plate, whereby a firm adhering of the photo-
graphic plate to the plate-holder is obtained.
In order that no light may pentrate into the box, the guides of the slides b, bi
are provided with ledges z lined with cloth or other suitable material and fixed
to the box by means of screws z¹.
The manipulation with the improved apparatus is as follows:-
If the apparatus is in the condition shown in Figure 3, and a plate is to be trans-
ferred from the box to the dark slide, the corresponding slide 6 of the box and the
cover of the dark slide are opened, the screws is slackened, and the socket is
prossed towards the uppermost photographic plate (Figure 4). By turning the
nut p, the plate-holder by suction adheres to the plate, which is then raised by
means of the plate-holder up to the back of the dark slide. The plate holder is
then fixed by means of the screws, the slide 6 and cover i are closed again, and
the dark slide with the plate in it may now be taken out.
The dark slide can not be taken off before the slide 6 is closed, as one of the
pins u, u¹, catches into a corresponding notch of the dark slide, when the slide
of the box is opened. These pins are disposed in the frame of the box and are
acted upon by springs w, (Figure 2). The object of these pins is to prevent the
dark slide from being taken off before the corresponding slide of the box is closed,
which would cause the destruction of all the plates contained in the box. When
a used plate is to be transferred from the dark slide into the box, the mode of pro-
ceeding is reversed.
The apparatus may be provided with handles and may be constructed in
different forms, corresponding to the different forms of cameras.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, I declare that what I
claim is:-
1. Apparatus for changing photographic plates in day-light, characterized by
a plate-box a provided on each side with a slide b, b', and to which may be attached
the dark slide h provided with a plate-holder, serving to transfer the plates from
the box into the dark slide, substantially as described and illustrated.
2.In apparatus of the kind described in Claim 1, a plate-holder consisting of a
bolt which slides in a socket which is formed at one end with a shell », the
said bolt having attached at one end an indiarubber plate m enclosed by the shell,
so that when the plate-holder is pressed towards the uppermost glass plate and the
indiarubber plate is raised by means of a nut screwed upon the bolt, the plate-
holder adheres to the glass plate by suction.
2'
3. In apparatus of the kind mentioned in Claim 1, pins u, u¹ arranged in the box,
and catching into a notch of the dark slide h, when a slide b, b' is opened, thereby
preventing the taking out of the case before the slide b, 6' is closed.
4. In apparatus of the kind mentioned in Claim 1, ledges z attached to the
guides of the slides b, b¹, and lined with cloth or other suitable material, in order
to close the box tightly, substantially as described.
Dated this 10th day of March 1898.
Datu
'OROT
DIRTY TO ARD TO SU
EDWARDS & Co.,
65 and 66, Chancery Lane, London, Agents for the Applicant.