Courier Democrat. (Langdon, N.D.) 1891-1920, 1892-06-23
SCIENCE AND INDUSTRY
WHAT INVENTIVE GENIUS HAS
BEEN ACCOMPLISHING,
New Things in Phosographv--Ad
Vertising In the. Sky--Earth-
Qaakes and Plant Growths--
To Break the Force of
Waves.
New Things in Photography.

ments OF instantaneous photography
in recent years is that which has been
applied to the analysis OF the mo-
lions OF animals, such as galloping
horses, athletes running and jumping,
and so ON. y great deal has been
learned in this way about the manner
in which the limbs are managed in
rapid motion, and some misconcep-
tons have been corrected. One serious
difficulty that has been encountered
in the practical application OF photo
graphy to moving objects arises from
the TACT that, in certain cases, the sue
cessive images OF the moving animal
overlap one another in such way as
to produce confused picture.
This difficulty has been overcome
by a new method invented by PROBES
sor Marcy, and described recently in
the Revue Generate DIES Sciences. He
dresses the object to be photographed
and thus far he seems to have APP
piled the method only to man-in
black, marks distinct white lines and
spots upon the limbs whose motions
he wishes to record, and then causes
his subject, thus prepared, to pass in
front OF a black background.
Only, the white lines marked on the
limbs are photosraphically visible,
aud owing to their narrowness they
do not overlap i'll the pictures us the
comparatively broad images OF the
whole limbs would do.
Professor Marcy is able accordingly
to increase the number OF exposures
per second, and so to catch the NOV
ing limbs in q greater number OF sue
cessive positions. The pictures thus
obtained are interesting and instruc-
tive. A series OF white dots, arranged
in q waving line, represents the success
sive positions OF the runners head,
while bent white lines, following in a
rhythmical series OF positions, show
the play OF the arms and legs.
BY this method the motions Of an
athlete in the act OF making q running
high Jump have been photographed
on q scale OF twenty-five images pei
second, the result being beautiful
series OF lines showing clearly how the
limbs are carried at successive instants
in the course OF the jump.
Professor Marcy has photographed
an eel swimming, and astar-iishin the
act OF turning over; and writer in
Nature suggests that his methods and
apparatus may be applied to the
realization of wish of Prof. Ray
Lancaster that he could photograph
a running centipede, and the move
ments OF scorpions and spiders.
The rapid progress OF photography
in the discovery, on the one hand, O.
new wonders in the heavens, and the
revelation, on the other hand, o.
many hitherto hidden facts concern
ing familiar objects upon the earth
is one OF the most notable phenomena
OF this distinct vely scientific age.
Another Case In Which Nothing But
Electricity Could Do the Work,
The water supply bloomington, Ky.
comes from reservoirs about eight
miles distant through a single line o
pipe. The fact that but single line
is in use, makes it of the utmost i'm
portancc that it shall be carefully
watched, SO that anything that en-
dangers its integrity may be removed
at once, and repairs be made where
required at the earliest possible mo
ment, so as to avoid the increase O.
damage which always results where
attention is delayed. In fact, il
makes it necessary that every de
feet or impending danger be nipped il
it's incipiency.
1t would be costly and difficult
task to patrol the pipe line constant
ly, day and night, year in and veal
out, and would require at least two
relays Of quite a number OF patrol
men.
A novel method of accomplishin!
this patrol at much less cost is to b.
tried-the outcome OF which we await
with interest. 1t is proposed to con
meet the reservoirs and the city Office
of the waterworks by q telegraph line
paralleling the pipe line. Connected
with this wire will be signal boxes 10
Gated in the farmhouses along the
way, and with each will be card o
instructions as to what signals shall
be given under different conditions
For instance, one ring in case OF 6
land slide; two in case OF q small, anc
three in case OF a large leak, and more
than this in case OF something
more serious. These signals vii
be simultaneously received a.
both ends of the line. Eacl
signal box will also transmit with any
signal sent from it, it's owl number
just as the fire alarm boxes do, sc
that every signal will carry with it thu
locality whence it was sent. This will
enable the company to dispatch al
once force OF men OF sufficient
strength to repair in short order thu
damage Indicated. A slight reward tt
the discoverer of damage to the line
it is thought, might serve as an incen
tive to extra vigilance. 1t might, how
ever, act in another way, viz: serve a!
anincentlve to create damage, in ord
er to reap the reward due to announc
ing it.-Electricity.