xlviii Annual Report of the Council. 



was Vice-President from 1908 to 191 r, and was requested to 

 accept nomination for the Presidency, l)ut declined. 



During his period of membership he contributed papers on 

 "A Mechanical Device for the Solution of Problems in Re- 

 fraction and Polarization" (1897), "Grating Films and their 

 application to Colour Photography" (1899), and '"On the pro- 

 duction of Polished Metallic Surfaces having the properties of 

 Jai)anese 'Magic Mirrors' " (1903) ; but it was perhaps more 

 for his numerous and valuable short communications, which he 

 so frequently made, and the instruments he exhibited at the 

 meetings of the Society, that he was so highly esteemed by his 

 fellow-memljers. Amongst his short communications may be 

 mentioned : " On a Method of Producing a Spectrum-like Band 

 from a Bolometric Curve" (1900), "On a Method of Silvering 

 Diffraction Films" (1900), "On an Instrument designed to 

 yield a pure Monochromatic Image of the Sun" (1901), "On 

 Shadow Bands" (1905), " Description of a Method of Silvering 

 Transparent (Jrating Replicas " (1909), and "A New Method for 

 Testing the Curvature of Parabolic Mirrors" (1911). His 

 exhibits, which were perhaps even more interesting, were {inter 

 alia) " Diffraction Grating on Speculum Metal " (1896), " Copies 

 of Diffraction Gratings on Celluloid Films " (1898), " Apparatus 

 showing Photographs in Natural Colours by the aid of Gratings " 

 (1899), "An Apparatus for facilitating the Sighting of a Gun" 

 (1903), "Anew Direct-vision Spectroscope" (1905), "A new 

 form of Spring having a Constant Tension" (1908), "A 

 Silvered Concave (^rating " (1909) (presented to the Society), 

 and "Celloidine Castings of (jratings " (1913). 



In 190 1 he was awarded the Wilde premium for his paper, 

 "Grating Films and their application to Colour Photography " 

 and other communications to the Society. 



While actively engaged in his professional duties he applied 

 his inventive faculties in various directions, particularly with 

 respect to scientific apparatus and gas-works appliances. He 

 was the patentee of several dozen inventions, all of them 



