The Indianapolis journal., 1903-11-15

as the source of the ultraviolet rays. These
experiments were all conducted with this
lamp.
1T seems as though there is In willemite.
zinc oxide and other minerals some element
that possesses peculiar properties, and that
there exists in fuorspar some rare earth
that is anected by these various rays. 1t is
a fuorescene substance, different from any
thing that has ever been discovered
Ihe diamonds were the most responsive
From 5000. mined in British Guinea and
elsewhere, which were examined, forty four
were selected. After an exposure of sixty
seconds to the ultraviolet rays they glowed
for some time. They also glowed when
separated by thickness of white velvet
from the light. also through twelve thick
nesses of paper; but they did not glow so
brightly when black velvet was interposed
There is diamond here Of 15Ia carats which
phosphoresces with small hand lamp al
most as much as willemitc.
The ultraviolet rays do not penetrate
glass. but do penetrate rock salt. There
ity and another that responds to radio
activity. There are substances responding
to each other only; also those responding
to second substance and not to a third
also substances that respond to either or
all. We are on the threshold of a new field
of scientific facts. These qualities are of
value to detect elements hitherto unrecog-
nizable.
1.-THE invention of Goerl, which has been
perfected under the name. of the Piffard
lamp In the United States by DIR. Henry G.
evening, Is an instrument of great utility.
as he has proved 1T valuable medical ad-
Junct. This brings to mind possibility of
the utmost Importance There is the possi-
jected into the veins, intestines, etc, or II
might be taken In powders or in solution in
food, and thus nearer location effected in
organs desired to be examined. The entire
structure could then be examined. as well
as the bony structure as at present by the
Roentgen rays, under the ultraviolet rays
we may even reach new series of
elements"
At the conclusion of this address the
lights were put out and the gem expert
treated his audience to a wonderful ex-
hbition or light and color evolved from
great display of mineral substances un-
der the influence of radium, ultraviolet
rays and the Roentgen rays. The most
| pleasing effects were obtained under the
ultraviolet rays generated by the i'm
proved Piffard lamp. Some dozens of
| specimens spread upon table. and which
| in ordinary daylight were either colorless
| or uniform color. sparkled with all the
| colors OF the rainbow under the influence OF
! the rays. Those susceptible of phosphor-
escence f1uorescence, or both which
were brought near the lamp became bril-
| liantly luminous and parti-coored and re-
| tanned their luminosity for some time after
their removal from the neighborhood of the
| lamp. This lamp generates no heat
The effects of the Roentgen rays, as pro.
| duced In modified Crooke's tubes, were in
of the ultraviolet rays. '''0''
Laying aside a consideration Of the
minute quantity of radum used in the
| demonstrations, the effects of the minera
/ were the least spectacular of ALL The ra.
dunn Itself glowed family in the darkness
| Diamonds of seven to fifteen carats phos
| phoresced brightly for a considerable pe
| riod, and were visible from all portions OF
| the room. When enveloped In successive
| coverings of glass, rubber copper. lead anC
| iron the tiny pinch of radium had still tn,
| power TO compel the phosphorescence OF
| the gems.
1t Is worthy of note that pound of thi.
| remarkable substance would blind scorcf
and slay outright person venturine
j near IL