228 



Measuring of Lengths, Angles, etc. 



N". M HL' 



51482. 1:10. 



51484. 1 : 6. 



51485. 1:6. 



51 486. 1 : 4,5. 



51.482. Dividing Engine, Figure, 0.75 m long, of polished oak, with adjustable, iron arm 

 and female scale holder, iron runner, rails which can be conveniently adjusted as regards 

 height and sliders which may be firmly clamped, unscrewable bow, device for ob- 

 taining graduations of varying lengths, and with sliding drawing mechanism having 

 triple arresting device (Fr. phys. Techn. I, 1, Fig. 1959), without female scale . . . 



This machine is specially intended for glass and thermometer scales, also for simple scales on 

 wood, glass or opal glass. 



51.483. Female Scale for above, with 360 divisions of each 2 mm on one and 180 divisions 

 of each 4 mm on the other side 



51.484. Circle Dividing Engine, Figure, with plate 250 mm diameter, graduated on silver 

 in V* and graduations for the verniers, tangential screw and dividing drum, with Micro- 



scope (Chwolson, Physik, Vol. I, Fig. 131) 



51,485. Circle Dividing Engine, Figure, similar in construction to preceding, with plate 

 300 mm diameter, graduated on brass, without microscope (Fr. phys. Techn. I, 1, 



Fig. 1970) ' 



The circle is divided into 720 parts and has a tangent screw; one complete turn of this cone 

 sponds to '/t*- 



s. d. 



8. 5.0 



1. 4.0 



40. 0.0 



48.15.0 



