The Saint Paul globe. (St. Paul, Minn.) 1896-1905, 1899-04-09

portion, of the phototype is rendered
Opaque by an ink similar TO that l now
use. Th1s. then, will print black letters
On white background AS far as I
nave gone | can see my way no further
Tran to print posters. cards or things
"hlch use large type, for l have not yet
peen able to print type as small as that
used In a newspaper A better ink may.
however. obviate this difficulty
AS yet i have attempted to print Meth
ING elaborate. Before this can be dine
mechanical ingenuity must come to NV
rescue. There is practically no limit TO
the number of copies that can be print
ed at one exposure. This merely depends
on the strength of the current ami n
There Is 6 difficulty. however, about MAX
Ing a large number of copies. The X rays
radiate. and. while the upper sheets may
be all right. those at the bottom NAV
have some of the letters near the edge of
the paper spread out into grotesoue
shapes. This angle of radiati ton Increases
proportionally with, the thickness of the
senSo-block,o or the number of Sheets to be
printed. This also Is a drawback when
1t comes to printing large sheets In
my experiments l have used only small
sheets. chiefly for economy, but I think
l can overcome the radiation on a large
sheet by means of forms of some opaque
substance and the use of correspond
ing number of X ray tubes. The nearer
the ray goes directly through the tier
the results will be-
TO PRINT A LARGE NUMBER.
eff it Is desired to print a large num-
Der of sheets | have hit upon a plan
which Is entirely practical This is to
place a number of blocks around one
tube. Say, blocks of fifty sheets are use1
and twenty blocks arranged about one
tube; then We could get 1000 copies in
ten seconds exposure. 5000 copies per
minute, for each tube employed. Any
number of tubes may be used, so If ten
tables Were used in one room of fair
area. each holding twenty senso-blocks,
900 copies could be made I'm one minute.
The cost of printing would thus be enor-
mously reduced. The extensive use Of
sensitized paper would greatly reduce its
cost. and with proper facilities develop
ment and drying would be easy.
"A man working eight hours could. viii
every facility for work, make at least
$50 exposures. which represent at a mod
crate estimate 750,ee0 copies per day. BY
Increasing the number of worn and
tables the entire edition of a great news
paper could be printed In few minutes"
DR.. Kolle says that a sensitive paper
can be made which will come out of the
development process pliable and may be
bent and folded without breaking. The
time may come. therefore, when the X
ray will supersede the printing press.
This is not DIR. Kolles first success with
the X-ray. In 1896 his experiments gave
him wide reputation and he has come to
be an authority on the subject.
The X-rays cannot print colors. At the
present stage of development there is
little prospect of being able to print pic
lures. even In black and white, owing to
the fineness of the lines and the delicate
shading
One practical use to which Or. Kolle's
process can be Immediately applied Is the
comparatively safe transmission of secret
dispatches, where they are liable to seiZ-
llre and detection. Sensitized paper can
be used which will only yield to a certain
developer, both to be kept secret by the
government or persons employing them.
Upon sheets Of this paper elaborate dis
patches can be printed, and If the mes
senger is detected only apparently blank
sheets of white paper will be found in
his possession. When the sheets are de-
livered to the proper person an applica-
ton of the right developing fluid will i'm
mediately bring the message clearly into
view. This is one of the many interest
ing minor possible applications of the
new invention.