The Abbeville press and banner. [volume] (Abbeville, S.C.) 1869-1924, 1904-06-15

sible, six different views on as many
plates, measuring twenty-one by tWen-
ty-seven centimetcrs eight and one
tenth inches by ten and one-half inches)
were first taken. From these six
plates, which were designed with a
view to being connected to II another
in a continuous series, six enlarge
ments. one and onc-half by two meters
(four feet eleven inches by six feet
seven inches) in size were prepared
by mea of IN apparatus with q lens
thirty-two "entl"neters Zone FOOT In
diameter. The enlargements were
made directly on silver bromide paper.
The inherent difficulty of connecting
the single plates 20 as to avoid any
break was overcome so successfully
that it is practically impossible to de-
tect the boundary line of any two
plates. According to their character,
the six negatives were exposed for I'M
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
fcet) in breadth, the periphery thus be-
ing twelve and one-half meters FORTY
one feetJ, 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. acetic acid and sodium
hydroxide solutions. Each tank could
be shifted about on five iron wheels
moving along rails sixteen meters
(ifty-two and forty-eight hun
dredths feet in length. A gigantic
water tank, fifteen meters (forty-nine
and one-ifth feet in length, two meters
(siX and fifty-six one-hundredths feet
in breadth, and three-fourths meter
1.-TWO and forty-six one-hundredths feet
in height, having a total capacity as
high as 4TG.0S 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-
veloping the picture, the exposed paper,
fitted with a protecting cover, was
laid over the Stats of the wheel. The
wheel was then set rotating. AS it
turned, it dipped the lower part of the
paper into the developing liquid. The
light portions were especially treated
with sponges impregnated with ener-
getic developers. Portions whose de-
velopment was too rapid were checked
by means Of iced acetic acid solutions.
An iron oXalate developer was used.
After first ~interrupting the develop
Ing process by projecting iced acetic
acid on the photograph by means of a
hand pump, the paper was conveyed
into an acetic acid bath, where the
clearing process was completed after
twenty minutes time. The picture,
after an intense rinsing, was trans
ferred into the fixing bath, where it re-
manned three-quarters of an hour.
After another rinsing the photograph
was thence conveyed into the large
washing tank above mentioned, where
1t remained for about eight hours,
while a continuous supply and with
drawal of water took place. The total
consumption Of water used in washing
the print was about 1858 cubic feet.
After the water was drawn off, the
picture was stretched out on wooden
bars attached to the upper edge Of the
tank. where it remained for about ten
hours before it was completely dried
Berlin Correspondent of the Scientific
American.