_London, January, 29, 1872._
[Endorsing all that is said about the two jurors first mentioned, we ask
our correspondent if he can, after due consideration, indicate any
photographer, professional or amateur, in whom a greater degree of
confidence would be placed than in Col. Wortley?—EDS.]
COMBLIKE MARKINGS ON THE NEGATIVE.
_To the_ EDITORS.
GENTLEMEN,—Perhaps the following may explain the defect “J. H. M.”
speaks of:—During the hot weather last summer, while photographing an
engine in the open air, every plate showed comblike marks at one side of
the plate. After two days’ trial, and filtering the bath, changing the
collodion, &c., it struck me that the cause might be the partial drying
of the film. A piece of wet blotting-paper at the back of each plate at
once remedied the defect, and all came right. I now always place wet
paper at the back under similar circumstances.—I am, yours, &c.,