The evening times. [volume] (Grand Forks, N.D.) 1906-1914, 1906-09-27

camera and on the reel when it is be-
ing projected on screen. The film
is transparent celluloid. In roll
of 200 feet there are 5000 distinct pic
lures, and when reproduced on the
screen should run trife over two
minutes. AS nearly all the subjects
run from Is to 20 minutes it will be
seen that the average picture has a
length of about 1000 feet.
For the manufacture of moving pic
lures three rooms are required. One
is for punching and printing the film,
one for developing and one for drying
the film after 1t has been developed and
washed The punching and printing
room and the developing room must
be provided with ruby lights and white
light for illumination when necessary.
Rapid Picture Taking.
When the negative film or ribbon is
RECEIVED it is removed from it's tin box.
the black paper and tin foil carefully
taken off so it will not cause friction
and placed in perforating machine.
When sufficient quantity is perfora,-
ed for the camera reel it is nut in
light tight retorts ready for use in
the camera When the operator gets
to the place where the picture is to be
taken. the retOrts are taken out of the
carrying case and the one containing
the film is put on the camera. 1t is
then carefully treated through the
camera. Both retort and camera are
light tight SO that the daylight cannot
affect the film. Another retort known
as the "take-up" is put on the camera,
the end fastened on the spindle of
the retort. which is then closed. The
camera is now ready for taking the
picture. 1t has device for register
ing the number of feet and denoting
the speed at which the pictures are
being taken. Under favorable condi-
tons twenty-five pictures should be
taken a second, or 1900 per minute.
The exposed retorts are taken to the
developing room and the film is even
ly wound around drums made of
metal and given black enameling
The drums are large enough to hold
200 feet of film without overlapping.
The film is thoroughly soaked in fit
cred water before 1t is put into the
developing tray. Five gallons of de-
veloper are required and the work of
developing is accomplished by revolv-
ing the drum with the hand. AS the
drum, covered with the film, passes
through the developing tray it is care
iully watched and frequently all the
tricks of photography are used to
achieve results.
Huge Scale Photography.
Day and night effects are obtained
in the development of the film. When
the negative has assumed the proper
strength it is again removed to the
washing tray and thoroughly rinsed,
after which 1t is given the hypo bath
for fixing. the process being exactly
the same as in ordinary photography.
From the hpyo bath to the washing
trays and then coating of glycerine
is applied to soften the film. This
done the film is placed over the wood
en- drying drums which revolve auto
matically. number of large electric
fans playing flood of cool air upon
the film and Fastening the process
of drying. One hour, under favorable
conditions, is sufficient time for the
drying of film. The negative is then
removed from the drying drums, and
pieces of blank film. technically
known as Leaders," are fastened to
the ends of the negative by cement
ing All is ready for the printer.
The negative is placed on the prin-