St. Paul daily globe. [volume] (Saint Paul, Minn.) 1884-1896, 1896-03-11
CONCLUSIONS REACHED AFTER Ex-
PERIMENTS BY. NIIxOLA
TESLA = y -. !.
HE TAKES ADVANCED GROUND.
BELIEVES THAT THE RAYS CON-
SYST OF A STREAM OF MA
TERIAL PARTICLES -
May BE Thus Made Possible to Pro-
Ject Chemicals Into Any Part
of the Body.


trical Review will publish tomorrow a
communication from Nikola Tesla, de-
scribing for the first time his very. in
teresting experiments in photography.
The scientific world has been awaiting
an expression of opinion from Mr..
Tesla, who is know nto have begun
his experiments within an hour after
the news of Prof. Roentgen's discovery
was cabled to this country. In connec-
ton with Mr.. Tesla's communication
the Electrical Review prints two re-
markable photographs. One of these
shows the right shoulder of a man
taken through his clothing, a plate Of
glass three-siXteenths of an inch thick
and two inches Of wood. The radio
graph was made at distance of four
feet from the source of the x rays,
shows the ribs, shoulder bones and
bones of the upper arm. The other
photograph shows copper wire bent
to form the word "Roentgen," and was
made at a distance of eleven feet from
the wooden slide covering the sensitized
plate. Mr.. Tesla also states that the
rare faction of Crookes tubes used in
these experiments may be Increased by
electrical means to any degree desira-
BILE, far beyond that obtained by me-
chanical appliances. This method he
describes. In regard to the nature Of
x rays he says:
II am getting more and more con-
WINGED that we have to deal with a.
stream of material particles, which
strike the sensitive plate with great
velocity. Taking as a basis the esti-
mate Of Lord Kelvin on the speed of
projected particles in a Crookes bulb,
we arrive easily by the employment of
very high potentials to speeds Of as
much as 100 kilometres second. Now,
again, the old question arises: Are the
particles from the electrode or from
the charged surface generally, includ-
ing the case of an external electrode,
projected through the glass or alumni
mum walls, or do they merely hit the
inner surface and cause particles from
the outside Of the wall to fly off, acting
in a purely mechanical way, as when
a row of ivory balls is struck? So far,
most Of the phenomena indicate
that they are projected through
the wall of the bulb, Of what
ever material it may be, and I am
seeking for still more conclusive evil
dence in this direction.
EXPERIMENTS ON ANIMALS.
ut is now demonstrated beyond any
doubt that small metallic objects or
bony or chalky deposits can be infal-
libby detected in any part of the body"
Tesla has also secured photographs
showing the bony structure of birds
and rabbits, even to the hollow IF the
bones. He has secured a photograph
of a rabbit after an hours exposure
In which not only every detail OF the
skeleton is visible, but also clear out
line of the abdominal cavity, location
of the lungs and the fur are shown.
photographs of large birds show the
feathers distinctly. In another in
stance an exposure of forty minutes
gave photograph of the human skull,
but the cavity of the eye, chin, cheek,
nasal bones. lower jaw and conht c.
lions to the upper one, the vetebral
column and connections to the skull.
the flesh and even the hair,
Mr.. Tesla concludes his communica-
ton in the following interesting
words:
"By exposing the head to a power
full radiation strange effects have been
noted. For instance, 1 find that there
is tendency to sleep, and the time
seems to pass away quickly. There is
a general soothing effect, and I have
felt sensation of warmth in the up
per part of the head. AN assistant
independently confirmed the tendency
to sleep and a quick lapse of time.
Should these remarkable effects be
verified by men of keener sense Of OBJ
servation, I shall still more firmly be-
lieVe in the existence of M, taria1
streams penetrating the skull. Thus
1T may be possible ty these strange
appliances to project suitable chem
ical into anY part of the hndu,,