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A SIMPLE DRAWING AND PROJECTION APPARATUS 

 FOR MICROSCOPICAL LOW-POWER OBJECTS. 



By Walter Imboden, F. ft. M.S. 



{Read February 21st, 1908.) 



Feeling sure that many a microscopist has longed for a simple 

 appliance by means of which he would be enabled accurately to 

 trace microscopical images without the possession of special draw- 

 ing facilities, and without the strain upon the eye and neck 

 experienced in the employment of the majority of forms of 

 camera lucida, I am bringing this simply constructed but highly 

 efficient piece of apparatus before your notice. 



I had for a considerable time been in want of some satisfactory 

 contrivance, until the idea struck me to project the microscopical 

 image directly upon the drawing surface, where it could be traced 

 in the most convenient and easy manner ; and it is the object of 

 this paper to give the necessary information upon the subject. 



The sum-total of the necessary apparatus is as follows : 



(1) A microscope inclined to a horizontal position, fitted with 

 a long-focus condenser, a one-inch objective, and one or two 

 oculars ; 



(2) A projecting mirror ; 



(3) A light-screen ; and 



(4) An adequate illuminant. 



Of these the projecting mirror and the light-screen call for 

 some description. 



Journ. Q. M. C, Series II.— No. 64. 27 



