Year: 1888

page_text: We, HEINRICH MADFR, Photographer, and FRIEDRICH OERTEL, Merchant, both
of Augsburg, Bavaria, do hereby declare the nature of our invention to be as
follows
-
Our improved camera is rendered collapsible and provided with special devices
for regulating the position of the object glass, both as regards its elevation and as
regards its distance from the sensitive plate
The camera comprises a frume or main body, to the 10ur of which is hinged it the
bottom the glass plate holder The latter contains springs for retaining the glass-
plates by exerting a slight pressure, or for securing the slide which contains the
sensitive plate To the front of the camer body is secured the bellows carrying in
front the lens board or frame For setting the lens at the required distance from
the body, we employ a special mechanism This may consist of toothed pinion and
rick sliding between two straight guides, and provided in front with a socket or nut
for holding the spindle or post carrying at the top the lens, or it may consist of a
pair of lazy tongs or an expansible trellis work, the end of which 18 attached to the
end of the bellows, and a double-threaded screw spindle held in suitable bearings and
passing through a pair of screw nuts att iched to the rear end of the said tongs One
end of the screw spindle carries a button for turning the sime
For adjusting the vertical elevation of the object gliss or lens the post or spindle
carrying the same is provided with a mechanism adapted to operate in any position
of the bellows This imechanısın comprises a telescopic shift, provided near the front
end with a pinion, and near the rear end with a pivotal bearing The pinion is in
contact with a friction disc mounted on the lower end of the lens supporting spindle
The button
and provided with a screw nut through which the said spindle passes
which serves to turn the double-threaded scrow mentioned above, and that which
turns the telescopic shaft, are placed near together on the side of the camera.

page_text: The sides and the bottom of the apparatus are formed by hinged pieces of shect
metal
For fistening the stand, the appuitus is provided with two sochet-pie es on two
si les it right angles to each other, so that the apparatus may be crected in two
different positions
Dated th.. 562 J
T1000
FAIRFAX & WETTER,
433, Strand, London,
Agents for the Applicants
Improvements in Photographic Cameras
We, HEINRICH MADFR, Photographer, now of Jony, Wurttemberg, and FRIEDRICH
OFRTEL, Merchant, of Augsburg, Barn, do hereby declare the nature of our
invention and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following stitement
The apparatus hereinafter described and illustrated by the companying drawings,
Figs 1 to 13, differs from others mide for the sunt purpose principilly in the
arrangements of its component parts
Our improved camera is rendered collapsible and provided with special devices for
regulating the position of the object glass or lens holder, both as regards its elevation
and is regards its distance from the sensitive plate
The camera comprises frame or main body A, to the rear of which is hinged at b
the glass plate-holder B The latter contains springs e tor holding the glass-plates by
exerting slight pressure, or for securing the slide D, which contains the sensitive
plate To the front of the camera body A, is secured the converging bellows E,
curving in front the lens board or frame F For setting the lens it the required
distance from the body, we employ a special mechanism This may consist of a
toothed pinion R and rack S (Figs 1 and 2) movible between two strught
guides U and provided in front with socket or nut for holding the spindle or post s,
Carrying it the top the lens, or it may consist of pur of lazy tongs or in expansible
trellis work a, (Figs to d) the end of which is attached to the end of the bellows,
ind double-thre ided screw spindle & held in suitable beings and passing through
ap of screw nuts find g attached to the end of the said tong> One end of

page_text: the screw spindle carries a button in a convenient position for turning the sume, while
observing the glass plate
For adjusting the vertical position of the lens-holder, the post h carrying the
same is provided with a mechanism adapted to operate in any position of the bellows
This mechanism comprises a telescopic shaft 3, provided near the front end with a
friction roller G, and near the rear end with pivoted bearing K The roller G 18
in contact with a friction disc H, mounted on the lower end of the lens-supporting
spindle and provided with a screw nut through which the said spindle passes
button which serves to turn the double-threaded spindle d, and that which turns the
telescopic shaft 1, are placed near together on the side of the camera
The
By means of the device described above, it is possible to regulate the distance
of the lens-holder from the plate holder, as well as the elevation of the lens holder
The nut, together with spindle h, and the lens holder, may be lifted out of the
forked bearing m, after the screw n has been released
The sides ind bottom of the apparatus are formed by pieces ○ of sheet metal
provided with hinge joints o, p, r, and adapted to fold by turning inward, so that
the entire apparatus with its regulating mechanism occupies very little space, (see
Figs 8 and 9)
For fastening the stand, the apparatus has two socket-pieces J and K, provided
with screw threads and situated at right angles to each other, so that the apparatus
may be mounted either erect or crosswise
In the apparatus represented by Figs 10 to 13, the construction is modified as
follows
-
1-The camera body and the plate holder are made of metal in order to diminish
the size, increase the stability and durability and improve the appearance
2-Owing to the diminished volume, the lens-holder may be adjusted laterally
and vertically between wide limits, so as to adjust the camera for inconveniently
situated objects, for taking two views on one plate, and for stereoscopic views
3-The camera may be mounted upright or crosswise without unscrewing, by
simply tilting or turning and then securing it by a set screw
4 The principal part of the camera is the frame A, because it serves as support
and base for all other parts B, Fig 10, is the slide holding the glass plate, this
slide may be moved to and fro the whole depth of the frame A, but cannot be
taken off
The spring e (Figs 10 and 12) serves to fix the plate by pressing it upon the
fr une, or it may be placed crosswise, which causes the frame to recede and to make
room in the main frame A for the sensitive plate holder D to be inserted, as indicated
by Fig 12 The converging bellows E, Figs 10, 11, 13, the extremity of which
carries the lens-holder F, is attached to the frame A For stretching the bellows,
or shifting the lens-holder to get the original distance from the glass plate, we
employ a piece of sheet metal N Figs 10, 11 and 13, secured to the frame A
at o and p
This metal plate N is held to the piecos O by means of hooks or teeth q (Figs 10
and 11) and provided with a toothed rack S, pinion R, button or knob P, and set
screw Q(Fig 10 to 13)
The lateral adjustment of the rack and that of the lens tube at the same time
15 effected by means of a guide slot T (Figs 11 and 13) along which the sleeve U
of the rack, held by screw t may he moved to and tro, and the rach may be
subsequently fixed by a set screw, u
For raising the lens tube F, the lens board V (Fig 10) is raised in its holder W
(Figs 10 und 13) and then fixed by set screw v
If this vertical adjustment should not be sufficient, the entire apparatus is raised
in the direction of the lens tube by means of the stand, and the frame A placed
vertically by pressing down the two side plates O, which can be fixed by pressing
the detents wo of the piece N, into the recesses at q, thereby avoiding a distorted
umige of the object to be photographed

page_text: Having now particularly described and ascertained the nature of our sud inven-
tion and in what manner the same is to be performed, we declare that what we
claim is
1-A portable photographic camera provided with one of the following devices
for adjusting the height of the lens and its distance from the sensitive plate
a A post or lens rod s, a mov ible rach S, supporting the said post and guided
along the base of the camera, and a toothed pinion R gearing into the said
rack
b A pair of regulating buttons or knobs Land M, situated close to each other,
an expansible trellis work a adapted to move the bellows E, and to be operated
by the button L, a vertically movible lens rod h, a telescopic shaft 2, pivoted
at and controlled by the said button M, and a screw nut and roller G,
adapted to transmit the motion of the shaft to the lens rod
2-In a photographic cuners of the type indicated above, the means for the lateral
adjustment of the lens, chiefly comprising a curved slot г, Figs 11 and 13, and a
stand or tripod head X, provided with a hinge piece adapted to be turned to the right
or to the left and fixed by a set screw y
The whole substantially as described and illustrated