= 7 6 ===== 



Two forms of Stage Micrometers are regularly supplied: 



No. 118: 1 mm divided in 100 parts. 



No. 119 : 1 cm divided in millimetres, the last of which in tenths. 



With regard to ocular and stage cross-line micrometers refer to p. 80. 



Fig:. 37. 

 Micrometer Ocular. 



(Full Size.) 



Nos. 120 123. Micrometer Oculars. Oculars 

 sliding eye-lenses, "micrometer oculars", are constructed 

 for the purpose of facilitating exact adjustment of the 

 micrometer scale to the eyes of individual observers. 

 These are the HUYGEXIAN oculars 2 and 3 (Xo. 120) for 

 achromatic, and compensating ocular 6 (No. 122) for apo- 

 chromatic objectives. The upper part of the ocular-tube 

 is capable of being unscrewed so that the ocular-micro- 

 meter can be conveniently laid upon the diaphragm. 



By fitting a drum-shaped adapter to these micrometer oculars lateral 

 adjustment of the micrometer scale, or of, an index (see under Index Oculars, 

 p. 88), becomes also possible. When thus fitted, they are called "Drum Oculars 

 with Micrometer" and may also consist of either the HUYGENIAN oculars 2 or 3 

 (No. 121) or compensating ocular 6 (No. 123). 



No. 



118 

 119 



120 

 121 



122 

 123 



Stage Micrometer, in case 



Micrometer Oculars for Achromatic Objectives: 



HUYGENIAN Ocular 2 or 3 with micrometer . . 



D r u m a n d S c r e w 



for moving the micrometer laterally, called 



the "Drum Ocular with Micrometer", in case . . . 



Micrometer Oculars for Apochromatic Objectives : 



Compensating Ocular 6 with micrometer. . . 

 DrumandScrew 



for moving the micrometer laterally, "Drum 

 Ocular with Micrometer", in case . 



Marks Codeword 



10. Paviiniento 



6. Pavon 



18. Pavonazo 



40. Pavorde 

 31. Pavura 



53. Payaso 



