St. Paul daily globe. [volume] (Saint Paul, Minn.) 1884-1896, 1896-02-23
NORMAL SCHOOL PROFESSORS AT
WINONA MAKE SUCCESSFUL En-
PERINENTS.
FIRST TEST IN MINNESOTA
IN WHICH THE OBJECTS PHOTO
GRAPHED SHOWED IN PER-
Feet OUTLINE.
Bones of IL Hand and Skeletons of "a
Frog and Fish All Clearly
Shown.
Special to the Globe.

Special to the Globe.
WINONA, Mimi, Feb 22-Success
almost bcy0l the most sang uine OK
l'ectarions greeted the work Of Prof.
Z. T. Freeman, of the normal school,
assisted by Prof. O. j. Schneider, Of the
high school, last evening at the plant
of the Winona General Electric COM
pany. Here they Continued their ex-
pe1iments with the cathode ray. Be-
sides the two professors, only one per-
son was present, Robert Kemple STU
dent at the normal, whose hand had
finger deformed by a felon of which
they wished to photograph the bone
At II o'clock they were allowed the
sole use Of one of the direct current
dynamos. This current was run
through the induction coil, and, for
the first experiment, reduced to twenty
volts strength before it was sent
through the exhausted air tube, COM
monty known now as the Crook tube
AS is always necessary to secure the
X ray, the current wa run from the
negative pole to an aluminium plate,
and then made to jump some four
inches to the opposite pole, so giving
the required light An alcohol spe-
cimen of frog and a minnow, a lead
pencil and a small steel screw were
first photographed. The objects were
placed Immediately against the case
containing the sensitive No. 26 plate
In which the wooden slide had been
placed The light was some fifteen
inches away. The exposure was for
two hours from midnight until 2
o'clock this morning
The second experiment was under
exactly the same conditions as the
first, only the current used measured
thirty volts and the exposure was for
but an hour and a half. The objects
taken were a silver dollar dime. a
one-cent piece and the same screw as
In the first experiment. These were
this time placed in a leather purse.
which was so constructed as to cover
the coins with six thicknesses OF
leather. Robert KempIes hand was
also taken on one-haIf of the plate.
and held steady in correct position by
being tied with strings. At 4:3O this
morning the party adjourned to their
homes for little rest.
This morning they went to the pho
tograph establishment of George Barr
who developed the plates in an ex-
pertinent q day or so ago. The first
plate was little dim. This is ac-
counted for by the fact that it had been
struck by the light before it was put
IN the holder, previous to the expert
ment. The prominent feature was the
skeleton of the frog, it being the most
perfect. The screw showed simply in
showed very dirnly, but enough to be
easily traced. The same was true of
the m1nnoW. The plumbago in the
lead pencil showed nicely by a long
straight line between the dim outline
of the wood edges.
The second plate was the best-in-
deed it is considered as fine a plate
of its kind as has been taken. The
skeleton of the fingers of the hand was
very distinct. The bone in the end of
the -deformed=. finger showed how if
had grown in sort of knob-shaDe
and all the joints and lines are clearly
visible The purse was hardly to he
seen at all, but the coins within are
outlined as clearly as If there was
nothing between them and the plate
when the picture was taken. Even
the fine thread of the screw DEVELOPED
distinctly.
The experiment was a great success.
and great credit, is due the two pro-
fessors for their skill IN performing
the difficult task The materials used
We're mostly from the well-equipped
laboratory of thes state normal school
mere In first making the tests very
high voltage was tried, but as it fused
the wires used, the current was re-
duced to the amount given above.