P.S.--Why not devote a little more space to this fascinating art in "N. &
Q."? I think, if anything, it grows less latterly.
_Multiplying Photographs._--In Vol. viii., p. 60., you reprint a
communication from Sir W. Herschel which has appeared in _The Athenæum_.
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It describes a method of printing from glass negatives, but there being
no _cut_ renders the meaning somewhat obscure.
In the last number of the _Photographic Journal_ (21st ult.), some
mention is made of this letter. They say it proves to be one already
long in use, Mr. Kilburn having practised it for four years. I am very
desirous of obtaining more information about it. I want to know the
length of the box or camera required; and also the focus of the lens, and
the best size. Probably Mr. Kilburn or Sir W. Herschel would one of them
be so kind as to say.