ORTOL DEVELOPER. 



York, all that is necessary is to dissolve one package of A in 20 ounces of distilled 

 water and one package of B in an equal volume of water in another jar. For 

 normal exposure on 5 x 7 plates, add 3 ounces of A to 3 ounces of B and dilute with 

 2 ounces of water. The picture begins to appear in thirty to forty seconds and 

 development is completed in three to four minutes. To soften the harsh contrasts 

 of underexposed plates or plates overexposed in parts, give a longer development, 

 using 3 ounces of the alkaline solution to i ounce or ^ ounce of ortol and 4 or 5 

 of water. In the middle of a long development it is often important to change to 

 a fresh portion of the developing solution. For overexposed plates, reverse the 

 proportions, using i ounce or l / 2 ounce of alkali and 3 ounces of the ortol solution 

 with several ounces of water. The advantages of this developer are its quick action 

 and its freedom from stain and tendency to fog. The mixed developer may be used 



* txposunt SCALE ca 



PMILADCI.PHIA. M.. U.S.A. 



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FOR CORRECTLY TIMING PHOTOGRAPHIC EXPOSURES. 



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16 II 8 56 f 



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Fig. 128* 



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over and over until exhausted (browned). The quantity named above will suffice 

 for a dozen 5x7 plates properly exposed. This developer may also be used with 

 Velox paper. In this case it should be diluted with more water, say i ounce of the 

 ortol solution, i ounce of the alkali, 6 ounces of water, and 6 drops of 10 per cent 

 potassium-bromide water. 



*Fic. 128. Exposure scale set to show proper time for buildings and average near views at 10 

 a. tn. to 2 p. m. in July, with stop 64 (32 f ) and an intense sun. The various makes of plates are 

 divided into eight classes, and the time is read from the middle scale for intense sun and the most 

 rapid plates. Under above conditions a Seed's 27-X plate, or its equivalent (i), would require 

 one-sixth second. For light of a less degree of brightness E is set on the proper stop, and the time 

 is read from the bottom scale. The latter scale (G) is also used for slow plates. With intense 

 sun, i. e., as set above, a Cramer's isochromatic slow plate, or its equivalent (7), would require 2 

 seconds. In indoor work, scale K is first set on H, according to the quality of the light and num- 

 ber of windows. Scale L (kind of walls) is then set on the proper stop, and the time is read from 

 the bottom scale, according to the speed of the plate used. In latitudes far to the north of Phila- 

 delphia there must be considerable increase of time, and there must be a corresponding shortening 

 of time in tropical regions or desert regions. Considerable judgment must also be used in making 

 indoor exposures, especially toward sunset and soon after sunrise. Near sunset, exposures have 

 to be increased enormously. About three-fourths actual size. 



