JOURNAL 



OF THE 



ROYAL MICROSCOPICAL SOCIETY. 



JUNE, 1906. 



TRANSACTIONS OF THE SOCIETY. 



IV. — A Simple Method of Producing Stereo-Photomicrographs. 

 By W. P. Dollman. 



{Read February 21, 1906.) 



Plate VIII. 



I will endeavour to put in as concise a form as possible the 

 principal points in the production of the stereo-micrographs that 

 will be shown this evening. The method is very simple. I have 

 made a hobby of stereoscopic photography since 1865, and as well 

 have handled many Microscopes, optical work being always an 

 attraction to me. 



Some twelve or more months ago a friend called my attention 

 to an article on stereo-photomicrography in the " British Journal 

 of Photography Almanac " for 1894, by the then editor, the late 

 Mr. J. Traill Taylor, who therein explained several methods of 

 producing stereograms of microscopic objects. I adopted what I 

 thought the simplest method, that of obscuring by a semicircular 

 shield half of the objective in use. I had a cloth-lined brass tube 

 with one end half screened (blackened, of course), made to slip 

 over the lens, and to revolve smoothly on the mount. As the 

 objectives vary in diameter, the tube was made to fit the widest one, 

 and strips of cardboard were cut to make the tube fit the smaller 

 ones. 



In the case of photo-objectives — I have used these from 2-in. to 

 6-in. focus — a semicircular shield of thin blackened brass can be 

 dropped against the diaphragm between the combinations, and 

 this is certainly the better place for the screen. I have used a 

 2-in. Dallmeyer portrait combination (which is specially good for 



June 20th, 1906 s 



