—£. W—§lo-Slo—
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*
Edward W. Birkle
*

Courtenay and Cumberland

SEARLE'S SHOES

Superior Shoe Service
COURTENAY—PHONE 278

CUMBERLAND—PHONE 16

When on Vancouver Island, Make Your
Headquarters at

THE LORNE HOTEL

COMOX, B.C.
M. G. FAIRBAIRN, Proprietor

Licensed Premises

CENTRAL GARAGE

CYRIL BURNS

GENERAL REPAIRS - WELDING

TIRES - BATTERIES - PARTS

Courtenay, British Columbia

Phone 315 P. O. Box 217

G. A. TARBELL, Secretary-Treasurer

TARBELL’S LIMITED

Hardware, Sporting Goods
Electric Appliances
Telephone 98
COURTENAY, B.C.

|
J. H. MACINTYRE, President

P.O. Box 62 Phone 261

Central Builders’ Supply Ltd
"EVERYTHING FOR THE BUILDER”

Agents for
B.C. CEMENT, GYPSUM, LIME and
ALABASTINE PRODUCTS

BRANDRAM & HENDERSON
PAINTS and VARNISHES

COURTENAY - - -

= ~ —= |

Page Thirty

British Columbia

The second of a series of a new
“Shoulder Strap” feature, by Sergt. |
Carl Ledoux of the Criminal Investi- |
gation Branch, who conducts a ques-

tion box for the scientific investigator.

fast film, the shutter is opened at “Time,”
and the scene to be photographed is
“painted” with the flashlight beam, taking
care that the rays of the light do not flash
back into the camera lens. A good method
of “painting” is to start at the top, and
sweep the light slowly from left to right,
‘and then back again, until the bottom of the
scene is reached. Care should be taken to
have the edges of the respective “sweeps”
overlap slightly so that illumination will be
even on all parts of the scene. When the
painting has reached the bottom, then the
same process is repeated vertically, so that
a “grid” of light has been painted on the
scene. The flashlight beam should be moved
at a regular speed throughout so that ex-
posure will be even, except where detail is
required in some particularly dark spot
where some additional “painting” can be
done.

Very surprising results have been ob-
tained by this type of photography, but it
is entirely a “trial and error” method, and
some experimenting should be done to gain
experience as to the time required for a
satisfactory exposure. Next time you have
a little film to spare for experimental work.
try it, and you may be amazed at the re
sults obtainable from “electric torch” il
lumination.

If there is no Bs ES GE

QUESTION: “What is the smallest

amount of blood stain from which an analy-
sis can be made?”

ANSWER: This is a very difficult question
to answer, as much depends upon the cir-
cumstances. It is a good rule to send in to
the analyst any suspected article, regardless
of how small the stain may be, as it is only
by trial that the amount can be determined.

Another point is what analysis is re-
quired. If it is merely to say whether the
substance or stain is blood, then a very tiny
amount is all that is required. The test
which was outlined in this section last issue
using the reagent “benzidene” has success-
fully detected blood from mummies around
4000 years old. It can also be used on
specks as large as a pinhead. However, a
larger amount would be necessary to make

QUESTION: Are there any means by
which a photograph can be taken at night in
a building where there is no electric light
and no flash powder or bulbs are available?

ANSWER: Assuming that there is no elec
tricity in the building, and the photographer
has no flash bulbs or flash powder, it is still
possible to secure a photograph.

However, this is not easy, and much de-
pends on the equipment used. Always
bearing in mind that photography is de-
pendent on light, some torm of illumination
must be secured. This can be a Coleman
gasoline lamp, an oil lamp or even a flash-
light. Depending upon the brightness or
“actinic” value of the light, the aperture of
the lens used, and the speed of the film em-
ployed, the exposure may range from two
or three minutes to 15 minutes or longer.

No set exposure rule can be given for this
type of photography, and it is not recom-
mended except in cases of absolute necessity.
However, to the camera fan, a little experi-
mental work in this respect may yield big
dividends should occasion arise to use this
technique.

First, a tripod is a “must”.
tripod, then some very solid object should
be selected on which the camera can be
firmly placed. If the depth of focus is not
of primary importance, the lens diaphram
should be opened all the way, and the fastest
film at hand should be loaded in the camera.
Focusing should be exact, by measuring
from the lens to the point of greatest inter-
est in the photograph desired, and the scale
on the camera should be set accordingly.

Perhaps the best lighting technique that
can be used in experiments with this type
of photography, is the regular 3-cell flash-
light with new batteries. This gives a
standard light source, which can be later
duplicated reasonably well. The oil lamp
or other forms of low power illumination
cannot be duplicated nearly as well. When
taking a picture in this manner, after the
camera is firmly placed and loaded with

THE SHOULDER STRAP