THE BOOK OF THE LANTERN. 



121 



Between development and fixation immerse plate in Sol. of Alum, 

 1 oz. in 20 ozs. water, washing carefully before and after. 



Pyro 



Bro. Ammon. ... 

 Sulphite ... 

 Distilled Water to 



I. 



Mist. Ox. Potass 

 Brom. Potass 

 Distilled Water 



c. 



... 40grs. 

 ... 60 

 ...200 

 ... 20 ozs. 



II. 



Liq. Ammonia, 880 ... 

 Distilled Water ...20 



Equal parts. 



D. 



... 20 oz. avd. 

 ... 40grs. 

 .. SOozs.fld 



II. 



Ferrous Sulphate 

 Distilled Water 

 Sulphuric Acid 



6 oz. avd. 

 18 fluid 

 12 mins. 



Add 7 parts of I. to 1 part of II. just before using. 



LANTERN SLIDES FROM PAPER PRINTS ENGRAVINGS OB 

 PHOTOGRAPHS. 



There are certain main principles to be observed in 

 copying a photograph, or anj other kind of picture, if a 

 satisfactory negative, fit for printing a lantern slide from, 

 is to be expected. The copy should be illuminated by 

 diffused light only, and should never receive the direct 

 rays of the sun. A cloudless day is the best to choose, 

 for then the light is regular, and when the exposure has 

 been correctly calculated for the first picture, it will, during 

 some hours of the day, be right for the rest. At least this 

 is true, if we are copying a series of pictures of the same 

 dimensions. But, if our first copy is, say, 12 inches across 

 and our next one only carte de visite size and we want to 

 reproduce a negative of each, measuring 3J x 3J (the 

 standard size for lantern pictures), our camera must in the 



