X.i. :.l I'.i-J. 



Dividing Engines, Circular Vernier Models, Goniometers. 



229 



51488. 1:3. 



51490. 1 : 7. 



51492. 2: 3. 51493. 2: 3. 



51491. 1 : 8. 



51 498. 1 : 6. 



51.490. Circular Vernier Model, small pattern, sextant of 40 cm radius, giving 2 minutes d. 

 of arc, Figure 1. 0. 



51.491. Wood Protractor on Stand, Figure (F. C. G. Miiller's), with plumb bob (M. T., 



Figs. 6, 14, 15), for angular measurements in mechanics and optics 2. 10. 



51.492. Plumb Bob, brass, Figure, with steel tip. for unscrewing 0. 2. 6 



51.493. Plumb Bob with Spirit Level, Figure, of brass, with steel tip for unscrewing . 0. 5. 



51.494. Simple Gnomon, for class use (Noack, Leitfaden, Fig. 6) 0. 13. 6 



51.495. Surface Goniometer with fixed limbs, circle divided in 1 / 2 degrees, surface bar of steel, 



radius of circle 70 mm, in case, Figure 1. 16. 



51.496. -- idem, smaller, Figure, with detachable limbs, in case, 80 mm diameter . 1.12.0 

 51,496 a. - - i d e m, limbs undetachable i 1. 0. 



51.497. Field Goniometer (Ohmann's), for class use (Ztschr. f. d. phys. u. chem. U., 5, 1892, 



p. 166) 1. 15. 



51.498. Plumb Line, Figure 0. 5. 



For spirit and other Levels, see section " f S ^''' ^"' 



Equilibrium, etc. of Liquids. i.!^ uti. 



