PROCEBDINGS OF THE FffOTOGEAPBICAL SECTION. 1081 



Mr. Anthony exhibited and presented two ten by twelve prints, of 

 Derbyshire spar goods. The fine detail of parts, lustre, and very delicate 

 rendering- of the light and shade was quite remarkable. Mr. Anthony 

 stated that the negatives were developed hy an organic developer 

 containing sugar. 



Tlie Chairman presented an eight by ten print, portrait of a lady. 



Mr. O. G. Mason read the following paper : 



Artificial Light, and its Application to the Purposes of 

 Photography. 



To the great majority of photographers, peculiar circumstances of 

 time and condition have doubtless suggested the necessity of some 

 method for the artificial illumination of objects which are so located 

 as to be beyond the reach of direct or reflected solar light, in sufiicient 

 quantity to impress an image upon the most sensitive plate or film 

 in tlie camera. 



The photographing of intricate machinery in dimly lighted manu- 

 factories or in mines, and the interiors of public and private build- 

 ings, located in narrow streets of densely populated cities, or over- 

 shadowed by thick foliage, are cases which cause the photographer no 

 little perplexity. 



To the professional ]3ortrait photographer and copyist, a cheap, 

 and strong actinic light would prove a source of convenience and 

 wealth. 



That solar ligld (even when reflected without too great loss of 

 actinic force) is preferable to any other light with whicli we are yet 

 acquainted, I think no one doubts ; but that direct sunlight cannot at 

 all times be obtained, has been sufficiently demonstrated within the 

 last three months, during which time we have had a very small per 

 cent of good weather for photographic work in general, and that the 

 most perfect sj-stem of reflectors (within practical limits) ^/c) and must 

 fail to direct even a single beam of solar light to very many points 

 w'here actinic light is required, I think many practical pliotograpliers 

 have had occasion to observe. While iii one department of photo- 

 grapliy, namely, that connected witli microscopical investigation, 

 some method of artificial light is indiH])en6able, especially is this the 

 case in large towns or cities, whore the vibrations caused by heavy 

 machinery and vehicles of traffic are such as to utterly exclude the 

 jjossihilify of producing well defined inq)ressions during the business 

 hours of the day, as a simple calculation will make plain. A vibra- 



