64 



This form of stand has only recently been introduced by us. The small Stands 

 VI a and VTI are not fitted with revolving stages and are therefore not 

 adapted for work with polarized light. For this reason it was deemed desirable to 

 produce another small stand which, unlike Stand VI a , should not merely admit of the 

 use of the highest objectives, but should also facilitate work by polarized light. 

 This object was attained by the substitution of a revolving stage with engraved scale 

 for the fixed stage of Stand VI a and by adding a simple centring appliance for 

 objectives at the lower extremity of the tube. Fig. 30. 



Although the revolving stage has a diameter of about 80 mm (about 3'/ 4 in.), still, 

 it is advisable to use slides of the "Giessen" pattern (48 X 28 mm 2 X l'/s in -) 

 when working with polarized light, so that the stage may be completely revolved even 

 when the object is not in the centre of the slide. 



Selenite and Mica films in special settings may be conveniently inserted 

 between eye-piece and analyzer when using Stand Vl b in connection with one of 

 the polarizing apparatus, Nos. 173 and 174 (see p. 103). 



For the purpose of observing axial images it is best to use objective at. 

 screwed into the thread at the lower end of the draw-tube. 



Price : Code-words : 



No. 84: Stand VI b with cylinder-diaphragm, No. 39 ... Marks 160. . Pasavino. 

 85: iris-cylinder 40 . . . 166. . Pascua. 



86: illuminating apparatus, No. 41 .. 180. . Paseo. 



87: ,, polarizing apparatus, No. 174 and 

 selenite film for red of the I. Order, No. 182 (incl. 

 cylinder-diaphragm, No. 3QJ 208. . Pasilargo. 



Stand VII. 



The fixed stage of this stand is rectangular and measures 63 X 70 mm 

 (2Y 2 X 2 3 /4 m -)- The upper body, which is not inclinable, is fitted with the old 

 form of fine adjustment. The head of the micrometer screw has no scale 

 engraved on it. The coarse adjustment is gained by sliding the tube in or 

 out of a sleeve. Fig. 31. Rack and pinion movement not applicable. Illumina- 

 ting and diaphragm appliances the same as with Stand VI*. 



The prices quoted above include only the stands in mahogany cabinets, without 

 oculars, objectives and revolving nose-pieces. 



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



