74_ 



The surprising relief effect observed in the images, the comparatively 

 large object distance, the facilities for compensating even considerable va- 

 riations in the individual intra-pupillary distance and inequalities of power 

 of vision, all combine to give our binocular microscopes a very extensive 

 range of application. 



The movement of the casings of the PoRRO-prisms is sufficient to admit 

 of adjustment for any intra-pupillary distance within normal limits (56 76 mm 

 = 2 1 / i 3 in.). In cases where the eyes are abnormally far apart or close together 

 the actual measurements should be specified when ordering. 



We supply three different patterns of stands fitted with binocular tubes, viz: 



Statif X a . 

 GREENOUGH'S Binocular Stand. 



The upper body with the double tube is removable. Fig. 35 a . The 

 stage forms a square with sides of 100 mm (4 in.) and has an opening of 33 mm 

 (l 5 /ie m -) diameter. Hand-rests similar to those on PAUL MAYER'S Dissecting 

 Stand P I (see p. 78) may be attached at both sides of the stage and are always 

 supplied with each stand. After removing the upper body a vulcanite fork, 

 which accompanies the stand, may be screwed on to the body-tube carrier in 

 place of the stage. In this form (Fig. 35 b ) the instrument is available for 

 objects of any shape and may, for instance, be conveniently used as a so-called 

 "DermatoSCOpe" for examining the Skin &c., the body carrier being steadied 

 by the hand. 



No. 95: Stand's* Price: Marks 795. . Code-ivord : Pastle. 



With regard to other accessories also made after Mr. HORATIO S. GREE- 

 NOUGH's designs and known as the "Prism-rotator" and the "Capillary 

 Rotator" see pp. 109 and no. 



Stand X b . 

 BRAUS-DRUNER'S Binocular Dissecting Stand. 



This stand (Fig. 36) is primarily designed for the preparation of objects 

 which are too large to be dealt with on the stage of Stand X a . It is also ex- 

 cellently adapted for pond -life studies (whence it may aptly be termed an 

 Aquarium or Tank Microscope) and for the observation of portions of large 

 botanical objects, mineralogical specimens, &c., in short, for the microscopical 

 examination of small areas included within more extensive objects which are not 

 to be broken up into smaller fragments. 



The prieces quoted above include only the stands and cases, but without objectives 

 and eye-pieces. 



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



