of the box, one half occupied by a piece of ground glass
(e), tightly pressed upon the glass pot by a spring (i) beneath
the cross bar g, and fits the pot so accurately that it
effectually prevents the escape of the vapor of the iodine,
bromine or other accelerating liquid contained therein.
The other half of the lid is cut through, shoulders being
left at the four angles for the different sizes of frames,
designed to recieve the plate while undergoing the coating process.
When the plate is put into the frame, the cover b is shoved
under the second lid h and when coated to the proper degree,
it resumes its former position and the plate is placed in the holder
of the camera box. To test the tightness of the box, light a piece
of paper, put it into the pot and cover it with the sliding lid.
The burning paper expels the air from the pot, and if it
be perfectly tight you may raise the whole box by the lid.

VI. GLASS FUNNELS.--Are a necessary article to the Daguerreotypist,
for filtering water, solutions, &c.
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VII. GILDING STAND.--For nervous persons the gilding stand is
a useful article. It is adjusted to a perfect level by thumb
screws placed in its base.

VIII. SPIRIT LAMPS.--The most useful and economical of those
made are the Britania, as they are less liable to break;
and the tube for the wick being fastened to the body by a screw
renders it less liable to get out of order or explode.
Glass is the cheapest, and for an amateur will do very well,
but for a professed artist the Britania should always be obtained.