66 



When using a revolving nose-piece with this stand a clamping- ring, 



No. 51 (p. 47), will be found desirable. This will prevent the tube from slipping 

 down in consequence of the additional weight of the nose-piece and 2 or 3 

 objectives attached to it. 



Prices : Code-words : 



No. 88: Siand VII ?r//// cylinder-diaphragm, TVo. 39 . . Marks 80. . Pasioncro. 

 ,, 89: ,, ,, ,, iris-cylinder dia/>hm'm , No. 40 ,, 86. . Pasivo. 



,, 90: ,, ,, ,, illuminating apparatus, No. 41 . ,, 100. . Pasmazon. 



Tube-clamping-ring, No. 51 ,, j. . Pared. 



Owing to insufficient distance between stage and tube a revolving nose- 

 piece cannot be used on Stand VII in conjunction with the lower-power objectives 

 from ao to aa inclusive, and sliding objective-changers are., for the same reason, 

 entirely inapplicable. 



Stand IX a . 



This stand is primarily designed for use as an auxiliary in the labora- 

 tory and for technical purposes. The tube is not fitted with a draw-tube, 

 nor is the upper body inclinable. Its fixed circular stage (100 mm = 4 in. in 

 diameter) has a large opening which may be diminished by the use of a dia- 

 phragm. Its combined plane and concave mirror is universally movable. 



Stand IX a is fitted with coarse adjustment l>y rack and pinion only, and 



the construction admits of the convenient use of medium-power objectives having 

 numerical apertures not exceeding 0.65. See Fig. 32 on p. 69. 



Price : Code-word : 

 No. 91: Stand IX s . Marks 50. . Pasquin. 



Stand IX a is particularly well adapted for examining opaque objects, rock 

 and metal specimens, &c. , with low magnifications while using the vertical 

 illuminator. 



For particulars regarding the use of the vertical illuminator see p. 36. 



The prices quoted above include only the stands in mahogany cases, without eye- 

 pieces, objectives and revolving nose-pieces. 



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



