ON PHOTOGRAPHY OF METEOROLOGICAL PHENOMENA. 



FOEM.] 



Name of Observer 



Address 



131 



Focal length 



Place of Observation ' 



Description of Lens ^^ 



Make of Plate employed ' 



Please state also whether the Picture was taken by direct exposure, through yellow 

 glass, by reflection from black glass, or by any other special device 



Any other information. 



' If more than one place is used, take a separate Fcnn for each. 

 ° Name of maker and his description, such as ' rapid rectilinear.' 



" Maker's description, unless a special emulsion is used, in which case the Committee would be glad of 

 the full formula. 



* Insert point of compass towards which the camera was pointed. State wliether true or magnetic. 

 ' f.JL f_. or whatever the ratio may be. 



r'h l.l' *' 



' Great exactness is not required. 



' Insert P. for Pyro, P.S. for Pyro and Sulphite, E. for Eikonogen, P.O. for Ferrous Oxalate, Q. for 

 Hydroquinone. The Committee will be obliged for the full formula. 



N.B. — It is highly desirable that all prints should show some fixed obicet, such as a tree or chimney^ 

 In the absence of any such point of reference the print should be marked to show the north and the 

 zenith. 



At the same time, siDce effective help might be looked foi' among the 

 great mass of enthusiastic amateurs who possess little or no knowledge 

 of meteorology, and from meteorologists who know little of photography, 

 a short paper of elementary instructions was also distributed. 



Insteuctions.] 



Photographs are desired of clouds, lightning, hoar-frost, remarkable hailstones, 

 snow-wreaths, avalanches, glaciers, storm-waves, waterspouts, tornadoes, dust- 

 whirls, halos, parhelia, or any other meteorological phenomena or their consequences. 



General Instructions. 

 1. As soon as possible after exposing a plate, number it and fill in the' details 

 relative to it on one of the forms supplied. The more completely these are filled in 

 the more valuable will the photogi-aph be. 



K 2 



