We construct four different models of this kind of apparatus, viz: 



1. The * Large Mechanical-Stage, No. 44, Fig. 16. The range of 

 the movements of this pattern of stage is 50 mm (2 in.) in one direction and 

 35 mm (! 3 /s m -) m the other; the readings of variations in either direction are 

 taken from scales and verniers. (See "Zeitschr. f. wiss. Mikrosk.", vol. XI, 1894, 

 pp. 301304.) In the latest models a third scale and vernier is added for 

 recording the positions of the movable cheek-piece which secures the object slide. 

 This arrangement facilitates the convenient use of the apparatus as a "finder", 

 and the process of centring is at the same time much simplified by the addition 

 of a centring-glass - - an object slide having a cross ruled upon it. (For par- 

 ticulars see the directions for using this apparatus.) 



Price: Marks wo. . Code-word: Parauza. 



Fig. 16. Large Mechanical Stage, No. 44. 



a: lever for securing the lower sliding piece; b: clamping screw to arrest 

 the turning movement. 



The large mechanical stage, ivith centring appliance, may be 

 fitted to Stands I a and I % and an interchange of this stage for a 

 revolving vulcanite stage, No. 45, can be effected without hin- 

 drance. 



Price of Vulcanite Stage, No. 45, separately: Marks 25. . Code- word: Parar. 



The large mechanical stage may also be fitted to Stand l b 

 but, the centring appliance being omitted in that case, it cannot 

 then be exchanged for the vulcanite stage. 



