102 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



opened for changing the carbon, all manipulation of the lamp being done 

 from the rear. The right side wall is removable for adjusting the pro- 

 jection apparatus, which is screened off bj a black light-proof cloth. For 

 projection purposes the front wall is made to drop down and to form a 

 small optical bench for receiving the projection Microscope and illumi- 

 nating lens (fig. 20). On the roof of the bos are the two projection 



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objectives of 200 and 400 mm. focal length and exterior projection mirror 

 all secured to the same wooden attachment, which can be removed and 

 packed away inside. When this aperture is closed by a lid and clamped, 

 the apparatus has the external appearance of a strong well closed box. 



