37 



An illuminating appliance, No. 43, employing an incandescent lamp, by the 

 aid of which intense light may be at once directed upon any particular point to 

 be examined, is provided for use with Stand X c , known under the designation 

 of the Corneal Microscope. Similar appliances are also applicable to our other 

 binocular stands (see p. 76). 



Price of above-described Illuminator, No. 43, including j spare lamps: Mk. 36. . 



Code-word: Paraiigou. 



Regarding appliances for illumination, by cither transmitted or reflected 

 light, by means of a collective lens separate from the Stand or with the aid of 

 a spherical glass flask Jilled with water (such as is commonly used by engravers) 

 see pp. no and ///. 



B. The Stage. 



The <l illicit si oils of the stages of all our microscope stands, including 

 dissecting stands (excepting Stand P V), are sufficiently large to allow of any 

 size of object slide or carrier being used. Some of the stands are even fitted 

 with exceptionally large stages in order to meet the requirements of microsco- 

 pical examination of sections of brain matter or similar preparations. 



The opening 1 of the stage has in most of the stands a diameter of 33 mm 

 (! 5 /i6 m -) m order that the large field possessed by the objectives of long focus 

 may be fully utilized. It may, however, be reduced by the insertion of a dia- 

 phragm (the stage diaphragm) which is supplied with each instrument. 



In Stands VI and VII the diameter of the stage opening is only about 

 20 mm (about 3 /4 m -)- 



In the dissecting stands the size of the stage opening varies in accordance 

 with the particular purposes for which the stands are intended. 



Stands | a , l b , l c , ll a , Vl b and IX b are fitted with revolving stages with, in 

 the case of Stands l a and ll a , an arrangement for centring also. The latter is 

 fitted to Stand l c only when supplied in combination with the large mechanical 

 stage or the vulcanite stage. 



Mechanical Stages, i. e., mechanical means of moving the object within the 

 plane of the stage in two directions at right angles to each other, may be fitted 

 to Stands l a , l b , |, Il a , IV a and IV b . 



