CHAPTER IX 

 THE PROJECTION MICROSCOPE AND ITS USE 



350. Apparatus and Material for Chapter IX : 



Suitable room with screen, for projection; Projection Micro- 

 scope; Sunlight or the electric arc light; Specimens suitable for 

 projection ( 399) ; Tools etc., as for Ch. I. 



REFERENCES AND HISTORY 



351. For the history of the origin and development of the 

 projection microscope, refer to the appendix at the end of the book. 

 In this history will be given many references to the original sources 

 of information upon the subject. 



For works dealing with modern micro-projection, the reader is 

 advised to consult the works given in 2 of Ch. I. He is especially 

 advised to consult the catalogues of Zeiss and the other modern 

 makers of projection apparatus, for in them he will find directions 

 and suggestions for making the best use of the most modern instru- 

 ments. His attention is also especially called to the Journal of 

 the Royal Microscopical Society and to the Zeitschrift fiir wis- 

 sentschaftliche Mikroskopie. See also the Zeitschrift fur Instru- 

 mentenkunde, the English Mechanic and the Scientific American 

 with its Supplement. In every volume of these periodicals there 

 are almost always articles bearing directly on the problems in- 

 volved in Projection. 



GENERAL CONSIDERATION OF THE PROJECTION MICROSCOPE 

 352. Similarity of all projection apparatus. All devices for 

 projection are fundamentally alike in giving images of brilliantly 

 lighted objects. These images are projected upon some reflecting 

 surface or screen in a dark room. The projection microscope simply 

 gives images of greater enlargement than the other forms of 

 apparatus. It imperceptibly merges into the magic lantern, as 

 the magic lantern merges into the camera obscura. (Compare 

 fig. 121-122). 



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