The Rock Island Argus and daily union. (Rock Island, Ill.) 1920-1923, 1922-07-13

I Q1k o0y1t CI0WAD IMtV - - asss
plate Of ! baftleship. and how .
suH club hits ball are tvo 1o1g
standing mysteries that are 0ys-
tories NO longer.
The newest ultrA-r4plo camera
analyses the high speed motion OF
the she'll - though Il were moving
1t . snailb pace. To the eye the
shell, travelling at perhaps $500
feet second, seems 10 crash INTO
the target almost instantaneously
after It Is fred. The high speed
camera showssit creeping with .
rotary motion down to the arrhor
plate, wriggling It's way into the
steel, and sending bits q wreck
age floating slowly into the air.
/. The golf club shaft 10 shown by
the camera actually to bend for
ward as 1t, strikes the ball. That
the stick did this was suspected by
some players. but there was no
way of proving the point. The cam
era shows that az the club Is
brought down to the ball the force
Of the drive bends the shaft for
ward The head Of the club lags
behind from the force Of the stroke.
But at the instant the cluSnead
contacts with the ball the bend in
the shaft is reversed. The greater
the power back of the stroke the
greater the bend in the shaft.
Motions Is rapid as these have
hitherto been hidden even from the
quick eyes Of the usual high speed
motion. picture cameras. With
these, catching 10000 pictures a
minute, the shell would burst more
slowly than normally but not slow
| ly enough to show its exact action
The new camera is the inven-
ton Of C. Francis Jenkins Of this
city. His machine takes 100000
pictures a minute. This. is 100
times the speed Of . normal speed
motion picture camera. A motion
which is performed In one second
can by jenkins invention be spread
out over 100 seconds when turned
into film and shown on screen.
The race horse that you occa-
sionally see floating around track
in the movie EDITORIALS can be made
I'd go at one-tenth that speed by
Mr.. jenkins. The cameras in COM
mercial use, however, are swift
enough for this, sort Of thing, he
says. His machine goes after more
elusive subjects, with faster OF
more complicated action.
Invented Thirty Years Ago.
The principle of this camera was
Invented by MIR. Jenkins 80 years
ago, but it was only last year that
he developed it to take high speed
movies. Since then he has made 9
number of pictures for the arm,
and navy. None has been. publicly
shown.
| Besides wanting an answer Il
the question Of how . shell strike!
a battleship, the navy asked Mr.
jenkins to grind out an analysis O
a seaplane taking on. through tn,
water. The inventor had to film
this four or five times before cam.
era and plane got into action to.
Igether. The whole scene had te
be filmed in four seconds. This was
more than sufficient time since 400
feet OF film could be recorded in
four seconds. 1t even allowed q
margin of 100 feet Of film each side
of the action because the rush o.
the plane would fill only 200. The
only problem was to start the cam
era SO that the plane would dasf
out within the length Of the film
1t was a difficulty assignment, bu
Mr.. Jenkins filled it.
! High speed pictures Of airplan,
flights showed that no one had evel
been able to see-the bending ant
varying Of the propeller undel
great powers of the engine. Thi.
has been shown in detail by tn,
films and study of the conditio,
will probably lead to the produc
ton Of stronger, sitter blades.
| The navy also had pictures mad
OF. several pigeons being release,
from basket at the start Of race
The point IN question was whethe
the pigeons bumped into one an
other and we're hindered at tn,
start when released simultaneous
ly from one basket This pictur
showed the pigeons did interfere.
By chance facts that pigeon ex