For fixing use 4 oz. hypo to a pint of water.
In warm climates, use cold water. If it is not cool enough, the
gelatine of the negatives may give trouble. In that case, get colder
water, and use an alum bath. If water is precious, plates can be
sufficiently washed by moving them forward in succession, through
half-dozen soup plates filled with water.
If habitual use is not made of tabloid developers, &c., it is
advisable to have some in reserve, for use in the case of broken
bottles and spilt solutions.
Useful notes and maxims.
An over-exposed plate gives no dark shadows in the print.
An under-exposed plate gives no high lights. When in doubt, choose
the risk of over-exposure.
To test the safety of your camera--Half draw the shutter, and expose
part of the plate in the camera, in the sunshine, without uncapping
the lens, and develop.
To test the safety of your red light--Expose a plate, divide it into
two, develop half in the dark, and half for the same time, with the
same solution by the light you are testing, and compare the results.
This test is worth making, as photographers are apt to give
themselves much discomfort from exaggerated caution.
2. Itinerary.
Where there are efficient maps the only need is to mark in the
position of any antiquities, by cross-bearings to clear points, with
the compass, drawn in with a sharp pencil.
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