326 PROCEEDINGS OF THE SOCIETY. 



MEETING 



Held on the 20th May, 1914, at 20 Hanover Square, W., 

 Professor G. Sims Woodhead, M.A. M.D., etc., President, 

 in the Chair. 



The Minutes of the Meeting of April 15, 1914, were read and con- 

 firmed, and were signed by the President. 



The List of Donations (exclusive of exchanges and reprints) re- 

 ceived since the last Meeting was read as follows, and the thanks of the 

 Society were accorded to the donors : — 



From 

 Savage, W. G., Bacteriological Examination of Food ancH ^ Publisliers 



Water. 1914 / 



An Old Microscope Mr. J. Sterry. 



Martin's Philosophical Grammar Mr. John Forgan. 



The President announced that at the next Meeting Mr. Rousselet 

 would give a short description of the old Microscope which had been 

 presented to the Society. 



Mr. Watson Baker, on behalf of Messrs. Watson and Sons, Ltd., 

 exhibited a workshop Microscope for examination of screws. It was 

 pointed out that the Microscope was unusual, inasmuch as it had not a 

 foot, an attachment for a lathe bed taking its place. It was intended 

 for the examination of screws in the course of manufacture, and when 

 not in use it could be removed completely out of the way of the 

 mechanician on hinged joints provided for the purpose. 



In order that the diameter, the depth of the thread, the angle, and 

 width could be exactly measured, special micrometer screws were fitted. 

 These pushed the stage-plates forward, and as they progressed the rack- 

 work fitted to them engaged toothed wheels. The rotation of these 

 wheels wound springs which reacted and carried back the stage plates 

 when the micrometer screws were reversed. The body was mounted 

 between these plates for the purpose of moving across the screw itself, 

 and would measure up to an inch in diameter. The body could be set 

 at an angle by means of a tangent screw, and the position read by 

 verniers on a circle to five minutes. The eye-piece was webbed, and 



