Page 132 - The Wellington photographic handbook

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Small round white spots, which may be cut out of paper, are stuck
on the slide, so that when the slide is looked at in the hand, and
the picture is seen the right way round, the spots are at the two top
corners facing the worker. The lanternist then knows that if he
puts such a slide into the lantern with the spots downwards and
towards the light, the picture on the screen will be the right way
up and the right way round.

REDUCING LANTERN SLIDES.
It is sometimes necessary to reduce a developed lantern plate
which has been made too dense. The following solution will be
found very convenient for the purpose. It is also useful for remov-
ing any tint on the sky which may seem undesirable, or for any
other local reduction that may be needed. The reducing solution
:—
is made of
Potassium Ferricyanide ... 1 20 grains 7 grammes
Water to ... ... ... 20 ounces 500 c.c.
A dram or two of this (3 to 6 c.c.) is added, just before use, to
each ounce (30 c.c.) of ordinary hypo solution. The plate is
immersed in the reducer when it is to be acted on all over, or if
local reduction is required, the solution is applied with a small
tuft of cotton wool or a camel's hair brush. The plate, after
reduction, is well washed and dried.

TRANSPARENCIES.
WELLINGTON Lantern Plates are not intended to be
used exclusively for making lantern slides. They will be found
very suitable for transparencies which can be used for window
and lamp decoration. For this purpose they can be supplied, like
ordinary plates, in all sizes.

PRINTING CLOUDS INTO LANTERN SLIDES.
The operation of printing clouds into lantern slides, although
not easy to describe, is by no means difficult in actual practice.
* Before making up any formula, read the notes on pages 125, 126 and 134.
108