a fine finish, and similar had produced good impressions;
these same plates, when subjected to a long and light buffing,
would present a surface no finer in appearance to the naked eye;
but upon exposure to the solar radiation, would produce
a well-defined image in one fourth less time than the plate
without the extra buffing.

Coating the Plate.--For this purpose our mechanics and artists
have provided a simple apparatus called a coating-box, which
is so arranged as to be perfectly tight, retaining the vapor
of the iodine or accelerators, and at the same time allowing,
by means of a slide, the exposure of the plate to these vapors.
They can readily be obtained by application to any dealer,
all of whom can furnish them.

The principal difficulty in coating the plate, is that of preserving
the exact proportion between the quantity of iodine and bromine, or quick.
It is here necessary to say, that hardly any two persons see alike
the same degree of color, so as to be enabled to judge correctly
the exact tint, i. e. what one might describe as light rose red,
might appear to another as bright or cherry red; consequently, the only rule
for the student in Daguerreotype, is to study what appears to him to be the
particular tint or shade required to aid him to produce the desired result.
Practise has proved that but a slight variation in the chemical coating,
of the Daguerreotype plate will very materially affect the final result.

The operator will proportion the coating of iodine and bromine or accelerators
according to the strength and composition of the latter.

Experience proves that the common impressions, iodized to a rather light