Page 122 - The Wellington photographic handbook

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GENERAL REMARKS.

has been said that the finest way to display a perfect negative
IT
is by means of a good lantern slide. A lantern slide is nothing
more than a print on glass ; but to allow of the slide being
shown in the usual form of lantern, there is a standard size for
lantern plates, namely, 3£ inches square (in the United States
the standard size is 4 inches by 3J inches). The consequence is,
that unless the picture that we wish to make into a slide is on a
plate not larger than a quarter-plate, and does not occupy even
the whole of that, the negative must be reduced on to the lantern
plate.
Reduction is in no sense different from enlarging, except that
in enlarging the distance between the lens and the Bromide paper
is greater than between the lens and the negative, while in reduction
the distance between the lens and the lantern plate is less than
that between the lens and the negative.
When the picture on the negative is already of a suitable size,
the slide can be made by contact printing as with a piece of Bromide
paper.
WELLINGTON Lantern Plates are made in two distinct
grades, viz. :
98