ZOOLOGY AND BOTANY, MICROSCOPY, ETC 



541 



connexion is fitted to the front of the camera for use with the Micro- 

 scope and for receiving the photographic objectives •(microsummars) 

 by means of sliding adapters when the Microscope is dispensed with. 



Fig. 63. 



Leitz' New Large Photomicrographic Apparatus.* — This appa- 

 ratus, Ia in the maker's catalogue, is shown in fig. 6-4 (vertical position). 

 It is characterized by its long camera sliding upon an optical bench. 

 The essential advantage of such a camera consists in obtaining a large 

 variety of magnifications with a single objective ; but, in addition to 

 this, greater depth or focns is obtained by using an objective of rela- 

 tively low magnifying power with an extended bellows. The optical 

 bench, which is in two parts, consists of steel tubes mounted at either 

 end and also midway upon cast-iron feet, the two halves being con- 

 nected by a hinge arrangement. Upon these tubes can be fitted the 

 various carriers, the curved feet of which fit the tubes exactly, any required 

 position being maintained by means of clamping-screws. The camera 

 occupies one half of the optical bench and rests upon two carriers, one 

 of which holds the focusing screw, while the other carries the camera 

 front with a portion of the light-tight connexion. By means of the 

 hinge provided the camera can be brought into a vertical position : the 

 apparatus may therefore be used either vertically or horizontally, as 

 required. 



* Leitz' Catalogue, 43 G, Photomicrographic Apparatus, p. 6. 

 Aug. 16th, 1911 . 2 N 



