W. Crookes on the Wax-paper Photographic Process. 161 
description of the manipulation, as may render it more service- 
able to those who have not hitherto paid attention to photo- 
graphy in its practical details. This must be my excuse, if to 
some i seem unnecessarily prolix. None but a practical hotog- 
rapher can appreciate upon what apparently trivial aid 
Among those requisites, which may be almost called absolute 
necessaries, are gas, and a plentiful supply of good water, as soft 
as can be procured. 
4. The windows and shutters of the room should be so con- 
trived as to allow of their either being thrown wide open for pur- 
poses of ventilation, or of being closed sufficiently well to exclude 
every gleam of daylight; and the arrangement should admit of 
the transition from one’ to the other being made with as little 
€: , 
5. A piece of very deep orange-colored glass, about two feet 
Square, should be put in the window, and the shutter ought to 
be constructed so i 
di for illumination at night; 
arrangement for placing a screen of orange glass in 
rough deal benches should be put up in different parts 
F the room, witl shelves, drawers, cupboards, &. The arrange- 
tment of these matters must of course depend upon the capabili- 
ties of the room. ae ; 
7. The following apparatus is required. The quantities are 
_ those that we have found necessary in this Observatory. 
‘Hight dishes. 
Eight mill board covers. 4 
_ Three brushes for cleaning dishes. 
A vessel for melting wax. 
_ SECOND SERIES, VOL, XXII, NO. 65.—SEPT., 1856. 
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