230 



Measuring of Lengths, Angles, etc. 



No. 51 49fl - 



51504. 1 : 10. 



51.499. Model of a Mirror Reading (W. & E. phys. Prakt., Fig. 19), Figure, for sub- 

 jective and objective reading 



51.500. Planimeter (Amsler's), Figure, arranged for a vernier unit between 8 and 10 sq. mm, 

 as desired, with check ruler, in case . 



The pole arm is 19 cm long, the travelling rod 16 cm. 



51.501. - - idem, with micrometer and vernier on the travelling rod, for any values of the 

 vernier unit from 2 to 10 sq. mm, adjusted for 4 vernier units 



51.502. - - idem, with correction for parallel position of the roller axis and of the travel- 

 ling rod 



51.503. Slide Rule with Instructions (M. T., p. 24), 27 cm long, readings accurate to 3 places 



This slide rule is arranged for rapidly multiplying, dividing, squaring, cubing, obtaining square 

 and cube roots, for obtaining logarithms and numbers, sines and tangents. The slide rule is also used 

 as a scale for drawings and as a longitudinal rule for lengths up to 50 om. 



51.504. Demonstration Slide Rule, Figure, 2 1 / 2 m long, without stand, graduations 8 times 

 as long as in rule No. 51,503 



.".1.505. -- idem, with stand (Fr. phys. Techn., Vol. I, 2, Fig. 2030) 



51.506. Litre Vessel, cube shape, with black and white graduations in square centimetres 

 (M. T., p. 23; also see Meyer, Naturlehre, p. 7). The wood cube No. 51,514 fits this 



51.507. -- idem, cylindrical (Meyer, Naturlehre, p. 7) 



515 50S. Hollow Cube of thick sheet brass, volume 1 litre exactly, with white and black gra- 

 duation in square centimetres on two sides 



51.50!) Hollow Cube of 3 cm length of side (W. D., p. 60 [54]), for reducing the gramme 

 weight to the metric measure 



51.510. Vessel of 1 Cubic Inch, of brass, cuneiform 



51.511. Metal Cube with Hollow Cube of 1 cm side, fitting one in the other 



51.512. --idem, 2 cm side 



51.513. --idem, 3 cm side 



5J,514. Cubic Decimetre of Wood, cube shape, fitting the litre vessel No. 51,500 (Meyer, 

 Naturlehre, p. 7) 



ci. HI;. 



i:i!i. 

 5602. 



