88 PHOTOGRAPHIC PROCESSES. 



DESCRIPTION OP APPARATUS FOR MELTING AND FIL- 

 TERING THE EMULSION. 



Make a tin box 18in. deep, 12in. high, 12in. wide, 

 all sides inclosed except one. On the side that is not 

 inclosed make flange Gin. wide all round the opening. 

 Cut a hole in the partition where you intend flowing 

 your plates large enough to admit this box, let flange 

 fit up against the partition tight, so as not to admit 

 any light. Put oil stove in this box. It can, by this 

 means, be lighted and turned out without getting 

 light to plates, and the stove gets what air it needs 

 from the room not used for flowing the plates. 

 Also this plan keeps the smoke from the flowing 

 room. 



Make a tin dish 14in. long, Sin. wide, and Sin. 

 deep. In one end fasten a tin funnel in which a 

 glass funnel holding a pint can be put. Rivet this 

 dish upon top of tin box, leaving about 2in. of the 

 end, where the funnel is, extending over the side of 

 tin box, so as to set flowing pitcher under funnel in 

 filtering the emulsion. Put water in this dish and 

 keep it at 140 while flowing the plates. Set pitchers 

 containing emulsions in this water. Use dipping 

 thermometer to tell when the temperature is right. 

 The hot water will be around the tin funnel and keep 

 emulsion hot while it is filtering. Use a good-sized 

 oil stove so as to be sure and keep the temperature 

 at 140 to 150 while filtering and flowing. 



