The St. Mary banner. (Franklin, Parish of St. Mary, La.) 1889-1931, 1906-01-27
Stay-at-Hon,e Travelling
This Seeming Paradox is
Now Delightful Reality,
Because of Scientific AL
... vancement as Wonderful in
Its Way as the Telephone
TOUR OF THE WORLD
IN YOUR EASY CHAIR
BY ARTHUR BONSAL.


is merely a piece of reserve equip
ment-nature's provision against help
lessnesS in case of accident to Ont
organ Of vision"
Then my informant went on to ex
plain that person with normal eye
sight sees very differently from per
son with only one eye To demonstrate
that statement, l was asked to make
two or three personal experiments
First held my right arm out straight
in front Of me, on a level with the
shoulder. the hand open, the palm to-
wards the left. Holding it in that po
sition l looked at the hand with my
] right eye alone. keeping the left eye
! shut. found could see the edge
Of my hand and part of the back of
the hand. Next. keeping arm and
| hand in the same position. closed
| the right eye and used only the left
| eye. That time saw the edge of my
hand and a bit of the palm. but l
could not see around on the back of
the hand as before. Last Of all, used
| own surprise. l noticed that l could
then see the edge Of the hand. part of
the palm. and also part of the back
of the hand. Indeed, found l actu-
ally saw part way around the hand.
The representative Of the stere-
oSraphers then explained that BIZ
nocu!ar or stereoscopic camera differs
from an ordinary camera as two
eyed man differs from cripple with
only one eye. 1t has two lenses set
side by side as far apart as persons
two eyes. One lens takes in exactly
what would be seen by the right eye
Of person standing in the cameras
place. The other lens takes in what
would be seen by the observers left
eye. Prints made from the two mega
tives are, of course. almost alike and
vet never precisely alike. Their mount
ing on the stereograph card is a pro-
cess requiring exact, expert workman
ship. When the stereograph is set in
place in the stereoscope, the right eye
sees what it would see on the spot and
the left eyee sees what it would see on
the spot. The result is analogous
to that Of looking with both
eyes at your Outstretched hand.
You see part way around the
near objects, and that makes them
stand out real and solid just as they do
in your ordinary. everyday experiences
OF seeing things in your accustomed
(vs1- 10
perfect depth, perfect solidity, perfect |
space.
l was half apo!oSizing for my own
surprise over these new revelations. |
when my informant said, for my COM
fort:
1T is curious fact that almost no.
body should be aware of the vast diff
ference between seeing with only one
OF his eyes and seeing with his two
eyes. but it is So Professor LIE Conte,
the celebrated authority on optics, de-
ciares the field Of binocular phenome-
ma is closed world to most, even in
telligent people.
but now let me take my turn at
question asking. When your eyes
were in the stereoscope and you We're
looking off from that cliff and over
the town and out to the sea down in
was there any doubt in
your mind about things being the full
size of life?'
had to stop and think for an in
slant. NO" I said, there was no
1oubt about it at the moment of look
ng. 1t seemed exactly as If l were
here except that I missed the vivid
'Oloring of foliage and sea and sky.
But l suppose l must have been de-
'eived. Certainly these cards are in
ignificant in size"
mo. you were not deceived. You
we're quite right in thinking you saw
in full natural size.
suppose stereograph shows man
Who was actually thirty feet away
rom the camera at the moment Of ex-
osure. His image appears on the
rint only fraction Of an inch high. |
Tut when that tiny image, /seen
trough the stereoscopic lens at the {
stance of few inches. delivers it's t
lessage to the eyes, it has the effect a
the very message the eyes would ,
aceive from the full size man at the r
lrty- distance. The possibility
tn {" rrespondence Of impressions i.
lade " 4 large object at long dis r
'ncc aii1 : small object at short dis :
lnce is something readily observed. y
common letter envelope. held at @
ms length. may easily hide from +
lew picture twelve times it's size on n
lie wall of the room. 1t may even fill n
lie same focal angle as a whole build o
g al still grea.ar distance outside
e window. In tee case of stereo-
.lnhS the ia eft Is th.ci e r,1ra q fra a4;a .