SCIENCE- GOSSIP. 



309 



CONDUCTED BY B. FOTJLKES-AVINKS, M.R.P.S. 



EXPOSURE TABLE FOR MARCH. 



The figures iu the following table are worked out for plates of 

 about 100 Hurter & Driffield. For plates of lower speed number 

 give more exposure in proportion. Thus plates of 50 H. & D. 

 would require just double the exposure. In the same way, 

 plates of a higher speed number will require proportionately 

 less exposure. 



Time, 10 A.M. to 2 p.m. 



Between 9 and 10 a.m. and 2 and 3 p.m. double 



the required exposure. Between 8 and 9 a.m. and 



3 and 4 p.m. multiply by 4. 



Subject jF. 5-6 



F. 8 



F.ll 



F.16 



F.22 



F.32 



F.45 



1 



F.64 



Sea and Sky.. -^ j 



STo 



T*o 



60 



I 



Open Landscape 1 i_ 

 and Shipping 1 j ia0 



z\ 



32 



A 



j 



4, 



* 



1 



Landscape,with 

 dark fore- 

 ground, Street 

 Scenes, and 

 Groups 



1* 



JU 



I 



I 



I 



1 



2 



4 



Portraits in 

 Rooms 



}• 



4 



8 



16 



32 



- 



- 



- 



Light Interiors 



4 



8 



16 



32 



1 



2 



4 



8 



Dark Interiors j \ 



i 



1 



2 



4 



8 



16 



32 



The small figures represent seconds, large figures minutes. 

 The exposures are calculated for sunshine. If the weather is 

 cloudy, increase the exposure by half as much again ; if gloomy, 

 double the exposure. 



Royal Photographic Society. — The annual 

 general meeting was held on Tuesday, February 

 12th, at 66 Russell Square, London, when the 

 result of the election of officers for the year was 

 made known. Mr. Thomas R. Dallmeyer was 

 elected President. The Vice-Presidents are the 

 Right Hon. the Earl of Crawford, Messrs. Chap- 

 man-Jones, J. W. Swan, and General Waterhouse ; 

 Treasurer, G. Scamell ; members of the Council, 

 A. Cowan, T. Bolas, F. A. Bridge, E. J. Wall, J. A. 

 Hodges, W. Thomas, J. Spiller, H. Snowden-Ward, 

 G. B. Wellington, A. Mackie, J. W. Marchant, 

 R. Meldola, j. A. Sinclair, E. S. Shepherd, Rev. 

 F. C. Lambert, H. V. Hyde, W. B. Ferguson, P. H. 

 Emerson, T. Bedding, and C. H. Bothamley. The 

 following gentlemen were also elected to act as 

 judges in the Technical and Scientific Section of 

 the Autumn Exhibition : — General Waterhouse, 

 Messrs. Chapman-Jones and E. J. Wall. The 

 judges for the Pictorial Section will be Colonel 

 Gale; Messrs. G. A. Storey, A.R.A., P. 11 

 Emerson, J. B. Wellington, and F. M. Sutcliff. 

 The Council is strong, and under its guidance the 

 Society will doubtless make the same satisfactory 

 progress it has done during the past year or two. 

 We must, however, regret that Messrs. W. E. 

 Debenham and J. J. Vezey are no longer on the 



Council. The meetings lor March are : — 5th, Lan- 

 tern meeting, an illustrated lecture mi ■■ Koine," bv 

 Mr. W! B. Ferguson, K.C., .MA. ; 12th, Dr. Harting 

 will read a paper on " Recent Rapid Lenses " ; 1 9th, 

 a paper by Mr. Chas. B. Howdill, A.R.I. B.A., 

 entitled "Photographing Stained Glass by the 

 three-colour Process"; 26th, "Some improvements 

 in Optical Projection," by Mr. J. 11. Agar-Baugh. 



Photographic Diary.— We have just rei 

 a copy of Wellcome's "Photographic Kxpo.-ure 

 Record and Diary for 1901," published by Messrs. 

 Burroughs, Wellcome & Co. It is produced in very 

 attractive pocket-book form, and contains much 

 useful information. Development with the different 

 " Tabloid " developers is very fully treated in a 

 thoroughly practical way. showing clearly the 

 many advantages claimed for this method of 

 development. We can speak from experience of 

 the great convenience of this system of carrying 

 the developer, &c, when on tour ; also of the 

 accuracy in the proportions of the various chemicals 

 used. Amongst other information, there is a most 

 useful series of " Tables of Exposure," dealing with 

 light values, lens aperture, subject-matter, and plate 

 speeds. These are arranged in a manner somewhat 

 similar to that at the beginning of this article. 

 The section devoted to recording the number of 



ir p 



plates exposed is neatly arranged with the fol- 

 lowing headings : No. of Slide, Plate, Subject, 

 Date, Time of Day, Light. Stop, and Exposure. 

 There are also several pretty little illustrations 

 as samples of subject-matter. We do not know of 

 a more useful note-book and guide to exposure 

 than this, and we would recommend all our photo- 

 graphic friends to obtain a copy. 



Hampstead Scientific Society. — In the 

 spring of last year the Council of this Society 

 authorised the formation of a photographic sec- 

 tion. The first Hon. Secretary of this section was 

 Mr. F. Lubbock Jerinvn. but as he has recently 

 been obliged to retire, his place has been taken by 

 Mr. Philip Joshua. Several indoor meetings have 

 been held, when demonstrations have been given 

 on photographic subjects. Mr. T. Manly gave a 

 lecture in October on " Ozotype," the new printing 

 process, and Mr. F. L. Jerinvn one on the History 

 of Photography. Two outdoor excursions also took 

 place — one to Tring and Ashridge, and the other 

 on Hampstead Heath. 



