It can then be dropped on any alarm
and picked up afterwards.
Photographic.[1]
In the selection of a camera much will depend upon the nature of the
work to be undertaken, the conditions of travel, and the climate to
which the camera will be exposed. For accurate work a stand camera is
always to be preferred to one of the hand variety, and care should be
taken to choose an instrument that is strongly made and of simple
construction. The essentials of a good stand camera are that it shall
be rigid, possess a rising and falling front, a swing back, and
bellows which will be capable of extension to fully double the focal
length of the lens to be used with it.
[1]Prof. Petrie is not responsible for this section, which is due to
the kind assistance of some professional photographers.-ED.
The rising and falling front gives a power of modifying the field of
view in a vertical direction. The swing back preserves the
verticality of architectural subjects. In some cases, when used with
the pivots vertical, it is a help in focussing the subject. The
possible extension of the distance between the lens stop and the
ground glass to twice the focal length (which is as a rule the
distance between the same points, when a distant object is in focus)
enables a small subject to be reproduced in natural size.
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