ST. 



BAIRD &TATLOCK (LONDON) LTD. 



996-997 998 



R. Pfeiffer's Erect-vision Dissecting Microscope (Leitz's). 



The stand of this microscope has been so designed as to render the instrument available for travelling pur- 

 poses. Its foot is made to fold up. The stage may he turned into line with the tube and the metal hand-rests 

 folded back upon the stage, to which they are attached by hinges. The stage opening is closed by a glass disc. 

 below which is an iris-diaphragm to regulate the size of the active opening. The stand is fitted with a plane and 

 concave mirror. Focussing is effected by rack and pinion. 



Two Porro-prisms are mounted within a tube in such manner that by two successive reflections of the image 

 formed by the objective an erect image is obtained in the eyepiece. The latter is of the Ramsden type. The 

 outfit includes objectives i, 2. 3, which possess considerable working distances. 



The following table gives the magnifications and working distances of these objectives in conjunction with the 

 eyepiece : 



Objective .. .. .. .. ..i 2 3 



Magnification .. .. .. ..20 42 <> diam. 



Working distance . . . . . . . . 46 mm. 20 mm. 7 mm. 



996 T Folding dissecting microscope, stand only 



A. Prism tube, with one eyepiece 



B. Objectives i, 2, 3 . . . . . . . . . . at I5/- each 



997 T Stand, with complete outfit 



Large Dissecting Microscope (Leitz's). 



Stand on heavy horseshoe base, large stage with glass plate, adjustment by rack and pinion. The lens- 

 carrier is movable for examining large plates. Illumination by movable plane mirror and white glass plate. The 

 case contains leather covered metal hand-rests which during use may be attached to the sides of the stage. During 

 dissection with incident light a dark metal plate may be slid below the stage. 



998' Stand, without lenses, in case . . 



999' The same, with three aplanatic lenses of the Steinheil type magnifying 8, 16, and 20 diam. 



1000 'The same with these lenses and Abbe's drawing apparatus 



1001 T The same stand with prism-tube for erect vision objectives i*, 2, 3, magnifying 20, 42, 

 and 90 diam. . . . . . . . . . . . . . . 



7 



5 



5 18 



CROSS STREET HATTOTST GARDETST, E-C 



