\ New Development in

Fingerprint Cameras
ING RECENT years the subject

ngerprint photography has become
asingly important in the detection of
> and the apprehension of the persons
msible. Anything touched by a crim-
while engaged on his lawless work
nes a potential source of information
ng to his identification and apprehen-
A great deal has been done in re-
years to perfect the technique of
eloping’ latent fingerprints. The
nal, and still most widely used method
dusting” latent prints with various
lers, has been supplemented with a
ber of chemical processes, such as
iodine vapour, silver transfer, and
‘s, where “dusting”’ is impractical.
fter the latent print is developed,
; must be taken for its preservation
identification. It will be appreciated
working from the object on which
print has been left often would pre-
serious difficulties, and thus it must
hotographed so that the fingerprint
rt can make a thorough search in his
inal files. Frequently fingerprints are
on windows, door casings, articles of
iture, automobiles, and other places
re their preservation and examination

is extremely difficult. Photographing the
“print” then becomes an absolute neces-
sity.

Years ago the photography of finger-
prints was done entirely with a standard
“view” camera, or any camera with a
bellows extension which permitted “fac-
simile” rendition of the object photo-

The comparison microscope with Det.-Sgt.
J. A. Young making an examination.

graphed. It is necessary in work of this
kind that the photograph of the finger-
print shall be exactly the same size as the
original to facilitate quick and accurate
identification. The ordinary camera,
when used for this purpose, must be
capable of having its lens system drawn
out to twice its focal length, or in other
words, to twice the distance at which it
is set on “infinity”. The camera is then
set up in front of the object to be photo-
graphed at an equal distance, when the

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‘-HTEENTH EDITION

Page One Hundred and Eleven