78 



Xo. 126. *Stage Screw Micrometer. For the exact measurement of 

 objects too large for inclusion in one visual field of the microscope we construct 

 the Stage Screw Micrometer. A slide moved by the micrometer screw carries 

 a rotating disc with divided cirde. The divisions of the drum indicate 0.002 mm ; 

 complete revolutions of the drum are counted by an index. The screw measures 

 up to 10 mm. 



The instrument is adapted for Stands I, III, IV and V. In subsequent orders 

 the factory number of the stand should be quoted. 



Fig. 39. Stage Screw Micrometer, Xo. 126. ('/ 3 Full Size.) 



Nos. 137 and 128. Goniometer Oculars. For measuring the angles of 



microscopic objects we construct the Goniometer Oculars, the former number 

 with .HUYGENIAN oculars 2 or 3 (Xo. 127), the latter with compensating 

 ocular 4 (No. 128). The eye-lens is adjustable as with the micrometer oculars. 

 A glass disc with a series of parallel lines ruled upon it rests upon the diaphragm. 

 An indicator, attached to the upper part of the ocular, moves within a divided 

 circle fixed on the draw-tube. 



Xo. 

 126 

 127 

 128 



Stage Screw Micrometer, in case 



Goniometer Ocular, HUYGENIAN ocular 2 or 3 



Goniometer Ocular, compensating ocular 4 . 



Marks Codeword 



120 Pecable 



35. Poeante 



48. Peceniento 



