The Delmar news., 1904-05-20
UnreeIing the Print Into the Clearing Bath

sible, six different views on as many
plates, measuring twenty-one by twen-
ty-seyen centimeters (eight and one
tenth inches BY ten and one-half inehes)
were first taken. From these six
plates, which were designed with n
view to being connected to one another
In continuous series, six enlarge
ments, one and one-half by two meters
-four feet eleven inches by six feet
seven inches) in size were prepared
by means Of an apparatus with lens
thirty-two centi'neters Zone foot in
diameter. The engagements were
made directly ON silver bromide paper.
The inherent difficulty of connecting
the single plates SO as to avoid any
break was overcome so successfully
that 1t is practically impossible to de-
tect the boundary line of any two
plates. According to their character,
the six negatives were exposed for un-
equal periods, varying between one
half and one and one-fourth hours.
In order to develop the picture, a
huge wheel was made of specially pre-
pared wood. The wheel was four
meters thirteen and twelve one-hun-
dredths feet in diameter and one and
three-fourths meters Give and one-half
feeD In breadth, the periphery thus be-
Ing twelve and one-half meters FORTY
one feet, and containing ninety Stats
intended for receiving the Photographic
paper. There were further used three
large tanks about seventy and one-half
cubic feet in capacity, intended respec-
lively for the developing, clearing and
fixing solutions, acetlc acid and sodium
hydroxide solutions. Each tank could
be shifted about on five iron wheels
moving along rails sixteen meters
(ffty-two and forty-eight hum
dredths feet in length. A gigantic
water tank, fifteen meters (forty-nine
and one-fifth feet length, two meters
(six and fifty-six one-hundredths feet |
in breadth, and three-fourths meter
two and forty-six one-hundredtils feet
In height, having total capacity as
high as 476.6S cubic feet. was further
used.
On account of the large developing
wheel used, the paper was developed
by night in the open air. Before de-
the picture. the exposed paper,
fitted with protecting cover, was
laid over the Stats of the wheel. The
wheel was then set rotating. As 1t
turned, 1t dipped the lower part of the
paper into the developing liquid. The
light portions were especially treated
With sponges impregnated with ener-
setlc developers. Portions whose de-
was too rapid were checked
)y means of iced acetic acid solutions.
An iron oxalate developer was used.
After first interrupting the develop
ng process by projecting iced acetic
Icid on the photograph by means of
land pump, the paper was conveyed
nto an acetlc acid bath, where the
'learing process was completed after
wenty minutes time. The picture,
fter an intense rinsing, was trans
erred into the fixing bath, where 1t re-
NAMED three-quarters of an hour.
after another rinsing the photograph
vas thence conveyed into the large
washing tank above mentioned, where
remained for about eight hours,
While continuous supply and with
travail of water took place. The total
consumption of water used in washing
he print was about 1858 cubic feet.
After the water was drawn off, the
lecture was stretched out on wooden
ars attached TO the upper edge of the
ank, where 1t remained for about ten
ours before It was completely dried
'erlin Correspondent of the Scientific
.merican.