The Microscope. 271 



HOW TO MAKE PHOTO-MICROGRAPHS. 



BY W. II. WALMSLEY. 

 SECOND PAPER. 



WITH whatever form of microscope employed a camera of 

 some description is a necessary adjunct, and there is 

 scarcely any limit to the style or form that may be employed; 

 though the desirable ones are few in number. The late Col. Dr. 

 Woodward made use of his dark room as a gigantic camera^ 

 The sun's rays without were reflected by an enormous heliostat 

 through suitable condensers into the microscope and thence to 

 a frame work (travelling upon a railway) which carried the 

 focussing screen and sensitized plate; the rest of the room be- 

 ing in total darkness. But such appliances are beyond the 

 reach of most workers, and it is therefore needless for us to con- 

 sider them further. A modified form of the same apparatus 

 may be employed with lamp light, by using two rooms and 

 carrying the light through an opening in the partition between 

 them ; but this involves trouble and expense, which may be 

 saved by employing a camera of suitable form, which is the 

 method most generally in use, and is that recommended by the 

 writer. 



My first photo-micrograph was made with a very simple 

 and crude apparatus, but one thut proved sufficiently effective 

 to turn my attention earnestly toward the possibilities of this 

 method of recording observations made with the microscope; 

 which instrument had for many years been a source of recrea- 

 tion and study, during my leisure evenings. Many and many a 

 time had I longed to perpetuate some of the wonders and beau- 

 ties revealed by the magic lens, but want of skill as a draughts- 

 man made caricatures of all my attempts with the pencil. Dr. 

 Woodward's magnificent photographs, and those by several 

 other celebrated workers were familiar to me ; exciting my 

 envy and admiration, but the appliances wherewith they were 

 produced were quite beyond my reach, and no literature on the 

 subject that I had ever seen threw any available light upon it. 



Like many another, I had dabbled a little in photography, 

 upon the introduction of gelatine dry plates, my outfit consist- 

 ing of a so-called pocket camera, by Walker, the inventor of the 



