Improvements in Dark Rooms Used in Photograpny.
Year: 1895

page_text: Improvements in Dark Rooms Used in Photograpny.
We, ALEXANDRE PIPON, and JULES PIPON, both of 15, Boulevard Saint-
Denis, Paris, in the Republic of France, Manufacturers of Photographic Apparatus,
do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in dark rooms used in photography and
has for its object to exclude the light from the dark room in a more perfect manner
than heretofore has been the case and at the same time render the same capable of
being folded.
To this end our improved dark room consists of a cylinder or tube the lower part
of which may be cylindrical or polygonal, and made to open by any suitable
mechanical means, which room is fitted with a frame corresponding in form with
metallic screens hereinafter described. To the said cylinder or tube which serves
to receive the object are hinged four or more legs which receive the covering of
the dark room, the said legs are connected together at their lower extremities by
jointed bars. To retain the said room in an extended position the said legs are
provided with small bolts around which are placed springs one end of each being
fixed thereto whilst the other end is bent in hook fashion and adapted to engage a
stud on the said bars in such a manner that in closing the said room the said bars
assume a straight position and the hook shaped spring ends turn on their studs and
force the said legs out or vice versa. Two of the said bars are each provided with
a recess to receive the said springs when closing and the whole thereof with
abutments which prevent them dropping. Metallic screens are provided in lieu
of ordinary screens made of wood strips mounted on cloth which slide and
intercept the light badly and are destroyed rapidly by the dampness and heat.
The metallic screens which we employ are formed of thin sheet metal with curled
edges which engage each other and forms a screen which slides well and intercepts
the light in a perfect manner.
Dated this 05th day of & nvil 1905
F. BOSSHARDT & Co.,
Agents to Applicants.
We ALEXANDRE PIPON, and JULES PIPON, both of 15, Boulevard Saint-
Denis, Paris, in the Republic of France, Manufacturers of Photographic 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 improvements in dark rooms used in photography and

page_text: has for its object to exclude the light from the dark room in a more perfect
manner than heretofore has been the case and at the same time render the same
capable of being folded.
And in order that our invention may be more fully understood we have caused
to be appended hereunto one sheet of drawings marked with letters of reference
indicating like parts in the various figures.
Fig. is an elevation partly in section of a dark room or chamber formed
square, Fig. 2 a side view of the same partly in section, Fig. 3 a plan of Fig. 1.
Fig. 4 an elevation of the room or chamber closed,
Fig. 5 an elevation, and Fig. 6 a sectional side view at line A-B of Fig. 5 of
the metallic screen shown in position in the frame, and
Fig. 7 a perspective view enlarged of a portion of the metallic screens without
its frame.
In carrying out our invention and referring to the figures generally, our
improved dark room or chamber consists of a cylinder or tube a the lower part of
which may be cylindrical or polygonal, and made to open by any suitable
mechanical means, which room or chamber a is fitted with a frame corresponding
in form with metallic screens hereinafter described. To the cylinder or tube a
which serves to receive the object are hinged at 6 four or more legs c which receive
the covering of the dark room or chamber, the said legs are tied together at their
lower extremities by bars d, e, jointed in their middle by means of rivets or bolt
and nut d, e. To retain the said dark room or chamber in an extended position
the legs care provided with small bolts d², e around which are placed springs fone
end of each being fixed thereto whilst the other is bent in hook fashion and adapted
to engage a stud
g.
As will be seen from the drawings the said bolts are fixed to the legs c of the
dark room or chamber and the studs g on the said bars in such a manner that in
closing the dark room or chamber the said bars turn on their fulcrums d¹, e¹ and
the hook shaped spring ends in the meantime on their studs thus tensioning the
springs to their limit so as to extend again the moment the legs are freed from
pressure. The bars d are constructed different from e, i.e. with recesses to receive
the springs when closing but all are furnished with abutments r so as to prevent
them dropping. The frame shown in Fig. 5 differs from those hitherto in use as
it is provided with metallic screens h in lieu of with screens made of wood strips
mounted on cloth which slide and intercept the light badly and are destroyed
rapidly by the dampness and heat.
The metallic screens which we employ are formed of thin sheet metal with curled
edges which engage each other and forms a screen which elides well and intercepts
the light in a perfect manner.
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-
1st. A dark room or chamber for use in photography having a cylindrical
upper portion and a cylindrical or polygonal lower portion arranged mechanically
in any suitable manner and particularly a dark room or chamber having a frame
with metallic screens.
2nd. In a dark room or chamber as specified in the preceding claim, the employ-
ment of a number of legs e adapted to receive the envelope and articulated at one
end by means of the hinges b, to a cylinder a and at the other end tied together by
means of bars d, e, adapted to fold in the middle around the pivots d', and
furnished with abutments r, all substantially as set forth.
3rd. In a dark room or chamber as specified in the preceding claim, the employ-
ment of springs fixed upon studs d, e, carried by the legs c the hooked ends of
which are permitted to slide on the studs g fixed upon the bars d, e, all substantially
as set forth.
:

page_text: 4th. In a dark room or chamber forming the screens of the frame of metallic
plates having curled ends adapted to engage each other, all substantially as
set forth.
Dated this 21st day of December 1805
F. BOSSHARDT & Co.,
4, Corporation Street, Manchester, Agents to Applicants..