54 



The draw -tube of Stand l b carries on its lower extremity a slide for the 

 reception of a low -power achromatic lens (a so-called AMICI-BERTRAND lens), 

 which is inserted through a flap-covered opening in the outer tube. This lens, in 

 combination with the eye-piece, constitutes an auxiliary microscope for the obser- 

 vation of axial images. There are two additional openings in the lower portion 

 of the outer tube; in one of which slides a light-excluding fitting carrying the 

 analyzer (not shown in the figure) for insertion above the objective; the other 

 admits a second slide for various quartz plates serving to determine the 

 directions of extinction or the character of the double refraction. 



A BlOT-KLElN quartz plate, as also a selenite film for red of the I. Order and 

 a mica film */ 4 A, in special settings, which fit into one of the openings of the 

 slide mentioned, are always given with Stand l b . Other selenite or mica films, 

 similarly mounted, are immediately interchangeable for the crystal plates referred to. 



In addition to the analyzer above the objective, a polarizer and an analyzer 

 with scale (for insertion above the eye-piece) are supplied with Stand l b . 



The objective combinations a<> and ai cannot be tiscd on Stand l b . 



Stand l e 

 (for photo-micrography and projection). 



Upper part with BERGER'S micrometer movement; very wide 

 body tube; draw-tube adjustable in sliding sleeve. The tube-column 

 is strongly fitted and shaped so as to form a convenient handle. Fig. 25. 



This stand, though primarily designed for photo-micrography and projec- 

 tion, may nevertheless be used with equal advantage for visual observation 

 in all other ordinary microscopic work. 



A. with revolving, centring vulcanite stage, No. 45. 



Price : Code-words : 

 No. 64: Stand I c with vulcanite stage and ordinary condenser, 



num. Ap. 1.40 Marks 325. . Parotida. 



65: Stand I c with mdcanite stage and swing-out condenser, 



num. Ap. 1.40 350. . Parpasola. 



The prices quoted above include only the stands in m? 1 jgany cabinets, without 

 oculars, objectives and revolving nose-pieces. 



Suitable complete specifications are appended at the end of this catalogue. 



