Improvements in Carriers or Sheaths for Photographic Plates or Films.
Year: 1889

page_text: COMPLETE SPECIFICATION.
Improvements in Carriers or Sheaths for Photographic Plates
or Films.
I FRANK MIALL 13 Shelgate Road Battersea Rise Surrey Manufacturer of Photo-
graphic Apparatus, 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 :-
My improvements in the construction of carriers or sheaths for Photographic plates
or films in which they are retained, before, during, and after exposure; consists of
either a square or rectangular piece of metal, vulcanite or other suitable material
turned up at the three several edges at suitable angles and furnished with suitable
holding catches or clips or springs which said improvements are more particularly
described, explained, and shown by reference to the accompanying drawings A Fig. 1
being the square or rectangular piece of metal, vulcanite or other suitable material-
B Bare the two edges which are turned up at right angles to the main body-C being
the other side edge turned up at a right angle which upset portion is again turned at
a right angle to itself as will be more plainly shown by Figs. 2 & 3 which are sections
of Fig. 1.
Fig. 4 is a suitable catch or retaining clip of which there may be one or more
to each carrier or sheath and attached by rivetting at H Figs. 1, 4, and 8 or other
suitable method to the body of the carrier or sheath which in some cases must be
recessed to receive the said catch or clip so that it may be flush with the surface.-A
spring E is needful in some instances but in others may be dispensed with and a pin
or projection shown at I. Figs. 14 and 5 formed in or on the catch or clip and which
engages and springs into a suitable and corresponding hole or recess (when the catch
is closed) formed in the body of the carrier or sheath the said pin or projection
serving to prevent the catch or clip from jumping out of position in the event of a
jarring movement when the plate or film is in situ.
I also form the retaining catch or clip in the manner shown at D. Figs. 6 and 7 so
that it may be the whole or part of the length of main body of the carrier or sheath
and attaclied thereto by countersunk or other form of rivets, screws or the like K Fig. 6.
which engage in a suitable slot or slots L Fig. 6. formed in or on the catch or clip or
the method may be reversed the rivits screws or the like being in the catch or clip
and the slot or slots in the body of the carrier or sheath which is stepped or recessed
shown at Fig. 7. so that all may be flush with the surface. I also form a pin or pro-
jection in or on the retaining catch or clip and a corresponding hole or holes or
depressions [Fig. 6 in the body of the carrier or sheath or the position of the holes
and pins may be reversed.
I sometimes prefer to attach to the sheath by rivetting or like manner one of the ends
of the catch or clip when only one is used and extends the whole length of the sheath,
the free end of which to have a pin or projection I Fig. 8 to engage in a corre-
sponding hole or depression in the body of the carrier or sheath shown in Fig. 8 or the
respective position of pins and holes may be reversed.
In the case of thin plates or films being used in these carriers or sheaths a spring
or springs J. J. Fig. 1 is attached to the body of the carrier or sheath to press against
the back of the sensitive plate or film so that the sensitive surface be made to bear
against the front edges of the sheath and the retaining catches or clip, and sometimes
when useing films and to prevent them being buckled or bent it is necessary to place a
rigid backing between the films and the springs J. J.
To place a plate or film in these carriers or sheaths the catches or clip D is pulled
up or back the plate or film inserted and the catches or clip replaced which then holds
the film or plate firmly and securely to be released by the same method when
reanired

page_text: Having now particularly described and ascertained the nature of my said
Invention and in. what manner the same is to be performed I declare that what
I claim is :-
(1) In the construction of carriers or sheaths for the holding of sensitive
Photographic plates or films substantially as described, the use of retaining catches
or clips.
(2) The use of retaining catches or clips substantially as described in connection
with carriers or sheaths for holding sensitive Photographic plates or films.
Dated this 9th day of December AD 1880
FRANK MIALL.