Improvements in or in connection with Photographic Changing-boxes.
Year: 1892

page_text: Date of Application, 30th July, 1892
Complete Specification Left, 29th Apr., 1893-Accepted, 2nd June, 1893
Improvements in or in connection with Photographic
Changing-boxes.
ARTHUR SAMUEL NEWMAN and JULIO GUARDIA, 71, Farringdon Road, E.C.
Manufacturers of Scientific Apparatus do hereby declare the nature of this invention
to be as follows :-
This invention relates to improvements in the means by which the carriers or
sheaths of changing-boxes are caused to come up to focus. For this purpose in
carrying out our invention we provide a partition or dummy carrier or sheath, (or
it may be a sheath sufficiently strengthened at the back) and the springs which take
up the shake in the box are fixed to the said partition or carrier in such a position
or manner that they do not injure the film of the next plate. This partition travels
along among the sheaths or carriers in precisely the same manner as the said sheaths
or carriers and may be made of so different a thickness or shape as to indicate when
the whole series have been changed or exposed.
Dated this 28th day of July 1802
ARTHUR S. NEWMAN.
J. GUARDIA.
COMPLETE SPECIFICATION.
Improvements in or in connection with Photographic
Changing-boxes.
"
We, ARTHUR SAMUEL NEWMAN and JULIO GUARDIA trading as "Newman &
Guardia of 71 Farringdon Road, London, E.C. Manufacturers of Scientific
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 :-
This invention relates to photographic changing boxes i.e. to apparatus such as
that for which the said Arthur Samuel Newman received the grant of British
Letters Patent No. 8329 of 1886 and similar changing boxes (whether same be
formed as separate detachable boxes from the camera or whether same be formed
integrally with the camera) our present improvements being specially applicable to
those changing boxes in which the sensitised surface (such as a glass plate or film)
is held in a carrier or sheath and such plates or sensitised surfaces passed round
successively from front to back or back to front as the case may be without lessening
the number of plates or sensitised surfaces in such pack.
"
Hitherto in changing boxes" of such character a spring or springs has usually
been arranged on the inside of the back of the changing box or chamber containing
the plates etcetera so as to constantly push forward the whole series or pack of plates
etcetera towards the front of the chamber and thus bring the front plate up to
register or as it is termed " up to focus."
This arrangement has many drawbacks which need not be here detailed but
according to our present invention we obtain all the spring pressure that is necessary
by arranging and mounting a spring or springs on a partition or dummy carrier or
sheath or it may be an ordinary sheath sufficiently strengthened and this partition
etc. carrying the springs thereon is placed either on the back or front or in any
desired position in the pack or series of plates to be exposed and passes round just
the same as each of the sensitised plates etc.
The springs on this partition or dummy sheath press forward those plates in front

page_text: of it so as to cause the front plate to come up to focus while the plates behind this
dummy sheath are pressed backwards against the back of the chamber and this
condition obtains whatever may be the position of this dummy sheath save when
this sheath is at the front position it will then press backwards on the plates only
while when it is placed in the rearmost position it will then press forward the whole
series of sensitised plates etc.
The springs on this dummy sheath or partition may be arranged and mounted in
any suitable manner subject to the following conditions:-
(1) The spring or springs must be so arranged as to permit the dummy sheath
being raised at the back and placed into the " "pack again at the front or
vice versa.
(2) The spring or springs must be of such a form and so arranged and mounted
as not to injure or cause any injury to the sensitised surfaces.
And in order that our present invention may be easily understood and readily
carried into practice we will proceed to further describe our said present invention
with reference to the sheet of drawings hereunto annexed.
Fig. 1 is a view of the front of a dummy sheath or partition having two steel
band springs arranged and mounted thereon according to our present invention.
Fig. 2 is an edge view on the line 1—1 Fig. 1.
Fig. 3 is an edge view on the line 2-2 Fig. 1.
is the dummy sheath or partition made of brass or any other suitable material.
bbare the springs fixed respectively towards each side of the partition a by
rivetting at c or fixed to a by any other suitable means.
The form of the sheath alone forms no part of our present invention and may be
of any suitable shape and construction to suit our purpose but for the purpose of
carrying our present invention into practice we may mention that we find it
advantageous to use all the sheaths (both those for holding the sensitised surfaces
and the dummy) constructed according to Newman's Patent No. 20299 of 1890
but we do not of course wish to limit ourselves to this particular construction.
It will thus readily be seen that by placing one of these dummy sheaths (carrying
springs arranged to act in the manner shown in the annexed sheet of drawings)
amongst a pack or series of plates arranged in a chamber and capable of being changed
in the manner described in Newman's said Patent No. 8329 of 1886 all shake in the
chamber will be taken up and while the front plate will be always brought up to
register (i.e. come up to focus) this arrangement will also ensure the rearmost plate
always coming exactly over the lifting device by which each plate is raised into the
light-tight bag to be changed from back to front or vice versa as the case may be.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is
A partition or dummy sheath or carrier having springs of any suitable description
mounted thercon and arranged to act in and in combination with a photographic
changing box of the character such as hereinbefore described in which a pack or
series of plates or sensitised sheets are successively passed round from front to back
or back to front substantially in the manner and for the purposes hereinbefore
described and illustrated by way of example in the drawings hereunto annexed.
Dated this 29th day of April 1893.
TONGUE & BIRKBECK,
34, Southampton Buildings, Chancery Lane, London, W.C.,
Agents for the Applicants.