224 



Measurement of Lengths, Angles, etc. 



No. M 1113 



51464. 1:11. 



51466. 1 : 10. 



51463. 1:12. 



51468. 1:8. 



22. 0. 



51.463. Cathetometer, Figure, large, constant apparatus, telescope being regulated by s. d. 

 micrometer screw, graduation on silver, capable of reading by vernier to Vso" 1 mm ; in- 

 strument rotating on journals 65. 0. 



Differences of height up to 1 m can be measured with the instrument; the prismatic, rotary 

 pillar has micrometer adjustment and 2 levels at right angles. A Fraunhofer magnifying glass with 

 micrometer and movable thread is fitted to the telescope slider for accurately reading the fine gradua- 

 tion. The reading telescope has a level fitted. 



51.464. Cathetometer, Figure, first-class construction, with massive prismatic pillar capable 

 of rotation about its axis 



The pillar of the instrument is 1.15 m high, is divided in millimetres, and is provided with a 

 vernier for Vo th mm. The telescope of 27 mm aperture, adjustable to any angle, and carrying a level, 

 permits of making readings at distances of from 0.6 to 10 m. 



."> 1.165. -- idem, telescope with micrometer screw and adjustable thread 



51,466. Cathetometer, Figure, telescope of 25 mm aperture, with rack and pinion focus- 

 sing; on steel pillar, and adjustable, for reading barometers and air thermometers, scale 



and \cinici <>l dcrmaa silver 



Tin- instrument has a range of 90 cm ; the vernier gives direct 0. 1 mm. The .instrument is main- 

 tained perpendicular by plummets. The telescope is provided with an inclinable level and has a fine 

 screw-adjustment. 



25. 0. 



7. 0. 



i I. IL 1 :!. :iL's;, 



rjl. IL'.Y 



