PHOTOGRAPHIC PROCESSES. 87 



canvas around the top, pour emulsion and water on 

 to the canvas, so as the water will filter off, take 

 emulsion with a silver spoon off of the canvas into 

 another bowl of water \ wash this way three times, 

 let drain, melt, add the alcohol and albumen as before 

 stated, and flow the plates. 



To PREPARE THE SILVER. 



Put a quantity of nitrate of silver into an eva- 

 porating dish on a sand bath, with a small amount 

 of water ; add to every pound of silver about the half 

 of the white of an egg ; fuse the silver until it has 

 melted and run back to an oily liquid ; take it off the 

 fire, cool and granulate. 



DESCRIPTION OF WASHING Box. 



Take a wooden pail, make a light-tight cover for 

 it ; put near the bottom a good sized wooden faucet ; 

 make out of galvanised iron a half-inch tube, with 

 three right angles in it, to keep light out, and on top 

 a small funnel of same material ; insert this tube 

 near the top of wooden pail ; let tube extend into 

 pail about two inches, and connect a rubber hose to 

 tube that will reach to bottom of pitcher containing 

 emulsion. The brine can be poured into the funnel, 

 through the tube, on to the emulsion, and when 

 ready to wash let water run into funnel, through 

 pitcher, and off at faucet below. 



