68 



The Microscope for the detection of trichinae. 



Stand IX a in conjunction with a specially constructed triple objective 

 gives three different magnifications by successively unscrewing the component 

 single lenses. It is recommended by Professor JOHNE of Dresden for the 

 detection of trichinae. A pair of eye -pieces, thus giving a range of six 

 different magnifications varying between 30 and 190 diameters, is supplied with 

 this stand. 



Price : Code-word : 

 No. 92: Microscope for the detection of trichinae 



incl. objective and 2 eye-pieces Marks 80. . Pastaca. 



Stand IX b . 

 (Small Mineralogical Stand.) 



This stand is similar to Stand IX a in size and, like the latter, is not in- 

 clinable and possesses coarse adjustment by rack and pinion only. 



The tube, which is not provided with draw-tube, resembles that of Stand l b 

 in carrying on its upper extremity a divided circle and a removable analyzer, 

 and a centring appliance and two sliding carriers at the lower end. One of 

 the latter carries a second analyzer, while the other is available for a quartz, 

 or other kind of crystal, plate for insertion above the objective. See 

 Fig. 34 on p. 71. 



A BlOT-KLEIN quartz plate, as also a Selinite film for Red of the 

 I. Order and a Mica film of 1 / A, all in suitable settings, are always supplied 

 with Stand IX b . Other Selinite or Mica films in similar mounts are always 

 interchangeable for the crystal plates mentioned. 



The polarizer is combined in a sliding sleeve with a condenser system of 

 1.0 numerical aperture. The upper lens of this condenser is easily removable 

 as, when using low magnifications, it is advisable to work with the lower con- 

 denser lens only. A sliding sleeve, within which the polarizer may be revolved 

 by means of a lever, is situated below the revolving and graduated stage. 



