No. 51436. 



Measurement of Lengths. 



221 





51423. 1:4. 



51426. 1: 10. 



51425. 1 : 12. 



51433. 1 : 9. 



Measurement of Lengths, Angles, Surfaces and Volumes, 



Dividing Engines, Slide Rules. 



* 51,423. Linear Vernier Model for the projection lantern, with forward vernier, demonstrating s. d. 



barometer reading, Figure (Ztschr. f. d. phys. u. chem. U. 16, 1903, p. 345), with 



screw adjustment 1. 5. 



* 51,424. - - idem, with rear vernier 1.5.0 



51.425. Linear Vernier Model with forward and rear verniers, Figure, of wood (Fr. phys. 

 Techn. I, 2, Fig. 2025) 1. 0. 



51.426. Linear Vernier Model, 1.10 m long, Figure, graduations on lacquered paper, 

 with 1 cursor containing on one side the rear and on the other side the forward vernier 

 (W. & E. phys. Prakt., Figs. 7 and 8. - - Gan.-Man. Fig. 54 and 55. - - Gan.-Eein. 



Fig. 1) 0. 10. 



51.427. - - idem, \\einhold's, larger, 2.30 m long, with 2 cursors of 1 m length for the 

 forward and rear vernier 1. 0. 



51.428. Millimeter Rule, of thin cardboard, 500 mm long, with horizontal or vertical figures, 



or without figures (M. T., p. 24) Per 10 0. 3. 



51.429. --idem, of wood, 500 mm long Each 0. 2. 



51.430. Millimetre-Scale, paper pasted on wood, can be used vertically and horizontally, 



50 cm long, with stand (M. T., p. 24) 0. 18. 



51.431. Prismatic Rule, box-wood, 30 cm long 0. 1. 3 



51.432. Metre Rule, wood, both sides graduated in millimetres, with brass bound ends . . 0. 3. 



51.433. Metre Rule, wood, Figure, with coloured graduations in centimetres (W. D., 



Fig 46 [42]) 0. 2. 



51.434. Ruler, white with black graduations and large figures, with 4 graduations: metres, 



yards, "saschen", "arschin" " 0. 15. 



51.435. Mirror Rule for the class, 5 cm wide, 60 cm long, graduated direct on the glass in 

 millimetres (Hahn, Handbuch fur physik. Schiilerubungen, p. 38. - - Kaiser, Physika- 



lische Schiileriibungen, p. 19), with wood stand 0. 16. 



51.436. -- idem, simple pattern, graduations oh paper, with wood stand ....... 0. 10. 



# Can be used with the Projection Apparatus. ' ',;_ r ,- :i7 



414.' 



