The Anaconda standard., 1899-01-29
THE LIGHT AND AIRY SIDE Of SCIENCE

perceptible to the eye, and the move
ments of the shutters, alternately ad-
mltting and excluding the light, ep-
rcafed upon watching its action, to be
absolutely uninterrupted when the solid
machinery actuated by description Of
a stationary bicycle, was driven at its
highest speed
You can understand that the expos
ure must be very short-from 1-250th to
I-40Oth part of a second--when ] tell
you that the impressions are taken at
the average rate of seven to eight feet
second. In a length of 200 feet there
would be 1,500 pictures Of small lantern
size. Some subjects require fully 5000
distinct photographs. In photogra nh
ing, say. the flight of projectile 1CO
images per second would be stored
upon the film
1T is not yet within the reach of tie
amateur to take his own photugrapns?" ?"
was the suggestion.
by way of reply to this question. a
case was presently exhbited-not much
larger than an ordinary handcamnra
from which projected a handle. With
TINS instrument perfected, it will, it
seems, soon he possible for any photog-
rapher to secure record not only of one
momentary pose, but of a whole eIi-
sode. What a terrible engine for evil
dence making in the hands of a skilled
detective! But, for the present. the
proprietary company, with others asso-
clated. take the negative films and eX-
change them. America and practically
! the whole of Europe very shortly will
be ransacked for subjects by expert
mutographists, so that no event of in
terest can pass unrecorded by them.
1t would take more space than can
here be afforded TO follow the light
tight box containing the exposed films
to the dark rooms. from which white
light IS rigidiy excluded in order 10 de-
scribe thc successive processes Of Gevel-
opment, washing. fixing and drying to
which the negatives must be subjected
The films are wound round huge reels.
ana ire reels are revolvcd through
baths, in which the chemicals are CON
tanned. The bromide printing-which is
CHOSEN because It can be done by arti-
hc!al lights accomplished by electric
ally controlled machinery, and the
latest invention is capable of turning
out l,bOe pictures an hour 1t is HOn-
derfnl thing to note how the brilliant
Whit" light is admitted for an instant or
;Wo, and how the machine comes to a
| StahdStill of its own accord should any
thing go wrong.
Between the biOgraph and the ,nuto-
scope there is this difference: The
| former requires its pictures in the form
OF long strip of celluloid, which is
| passed between very powerful cleo
| trlc arc lamp and the lens, at a rate
/ corresponding with that at which the
/ Gelarine film travelled through the cam
! era, but the mut0scOpe has the series
! OF prints-S00 10 1000 in number
J mounted in consecutive order around a
| cEinder, standing out like the leaves
| OF a book. and having the appearance
! or machine hair brush. AS the crank
/ IS turned these leaves reroive, and ex-
| pose 10 the spectator the pictures Sc
! !ected, the continuity cf the scene never
/ being broken.
! Some of the pictures that may be
| viewed on or off the stage by means of
| the biOgraph or the mutuscope are oh
| Tiously Manufactured. This remark does
| not, of course, apply to the marvellous
! Empire State express subjects, which
were obtained, in one case, by placing
the camera in front of the observation
car" with an engine behind it going at