92 



PROCEEDINGS 



OP THE 

 QUEKETT MICROSCOPICAL CLUB. 



At the 541st Ordinary Meeting of the Club, held on March 11th, 

 1919, the President, Dr. A. B. Rendle, F.R.S,, in the chair, the 

 minutes of the meeting held on February 11th were read and con- 

 :firmed. 



Messrs. Walter Richard Warren and Bertram Hyde Jones were 

 balloted for and duly elected members of the Club ; four nomina- 

 tion forms were read for the first time. 



The Secretary announced that there would be a Gossip 

 Meeting on March 25th, that at the next Ordinary Meeting on 

 April 8th Dr. Hartridge, Fellow of King's College, Cambridge, 

 would read a paper on " Microscopical Illumination," and that 

 the Kodak Company would exhibit three new light-filters that 

 were likely to be useful for photomicrographic purposes. 



Mr. Traviss exhibited and described an incandescent gas lamp 

 Ihat he had made on the principle of the lamp described by Mr. 

 Ashe in his recent paper. In the new lamp the incandescent body 

 is a disc of chalk-like consistency, impaled on a flattened pointed 

 wire. A small gas flame from a finely pointed copper jet, whose 

 distance from the disc can be adjusted, impinges on the disc, 

 which is grainless, and gives an excellent light. The lamp is 

 ■enclosed in a small metal cylinder to keep away draughts, and 

 mounted on a stand so that the height and angle can be adjusted. 

 The result seems to be perfect, as the difficulty of the unevenness 

 •of the mantle-image is entirely overcome ; the disc moreover is 

 much more durable than the cylinder of mantle material. One 

 which Mr. Traviss had had running for 800 hours was still in 

 ^ood order. 



Mr. Traviss also made some interesting remarks about the 

 ■" healing " of glass. Sir David Brewster referred to this 

 j)henomenon 150 years ago, and Mr. Alan Dick had recently 



