73 



fastened by tightening the screw 6". By altering the position of the clamping ring 

 the aperture in the silvered prism may be brought to the same height with the 

 exit pupil of the microscope. The screws L and H (Fig. 35) serve to facilitate 

 the accurate centring of the prism. (See Zeitschr. f. wiss. Mikrosk., vol. XI, 1894, 

 pp. 28!) 298, as well as the directions for use accompanying each ABBE drawing 

 apparatus.) 



The length of the supporting arm and the size of the mirror are the same 

 as with the preceding apparatus. The casing, together with the prism and the 

 moderating glasses, may be turned aside about the pin Z into the position indicated 

 by the dotted lines in Fig. ;>f>. 



No. 112. *Large ABBE Drawing Apparatus. This form of the apparatus 

 is adapted for the oculars with enlarged field of view but it can also be used 

 with ordinary oculars. The length of the arm supporting the mirror is 125 mm 

 (5 in.), the size of the mirror 80 X 125 mm (3y g X 5 in -)- 



Drawing Tables and Boards. 



In order to obtain copies of objects free from distortion and with a field of 

 view of fair size, it is advisable to use a support for the drawing paper, inclined 

 at the proper angle. We supply various patterns of drawing tables and boards 

 suitable for this purpose. 



Nos. 113 and 114. The two forms of *BERNHARD's Drawing Tables satisfy 

 in a perfect manner the twofold requirement of being adapted for regulating the 

 height of the drawing surface above the work table and for varying its degree 

 of inclination to the horizontal plane. (See Zeitschr. f. wiss. Mikrosk., vol. IX, 

 1892, pp. 439445, and vol. XI, 1894, pp. 298301.) 



With tables of above pattern the drawing surface may be raised to a height 

 of 17 cm (6 3 / 4 in.) and inclined at an angle of about 35. The microscope is 

 clamped to the base of the drawing table, and arm-rests are provided in order 

 to give the operator's hands the steadiest possible position. 



Xo. 

 112 



118 

 114 



Large ABBE Drawing Apparatus (for oculars with enlarged 



field of view), in case 



BERXHARD'S Drawing Table, for use with erect Microscope 

 BERNARD'S Drawing Table, for use with inclined Micro- 

 scope 



Marks Codeword 



72 Paulatino 



45. Pausado 



52. Pantador 



Qazt 



