252 



General Mechanics. 



No. M 708 



51 768. 1:15. 



51769. 1:13. 



51771. 1:8. 



51 764. 1 : 9. 



51.768. Dynamic Balance, Figure, with graduated rail track, adjustable holding pegs 



and two carriages connected by spiral springs (M. P. I, Fig. 80) 5. 0. 



51.769. Work Rail (Maey's), Figure, with 2 weights (Ztschr. f. d. phys. u. chem. U., 

 15, 1902, p. 268; Kleiber, Lehrb. d. Phys., 3 rd Edition, 1901, Fig. 38), for determining 



the energy of motion - 10. 



One of the weights is twice as heavy as the other. If the lighter weight is allowed to fall from 

 double the height that the heavier falls, the slab (pan of a spring balance) on which the weights fall 

 are depressed to an equal extent. During its downward motion the plate describes a mark in front 

 which remains at the lowest position. 



51.770. Pistol for determinations of mass (Grimsehl's), Figure 51,841, p. 263, with shots 

 and weigh pan, graduated (Ztschr. f. d. phys. u. chem. U., 16, 1903, p. 136) . . . 



.M.771. Double Gun (Grimsehl's), Figure, for kinetic determinations of mass and for 

 ascertaining the relations between force, mass and motion, with 10 shots and 1 cleaner 

 (Ztschr. f. d. phys. u. chem. U., 16, 1903, p. 138) 



51,772. Dynmeter (F. C. G. Miiller's), see Magnetism Section, No. 60,133. 



Dynamometer (Fischinger's), Figure (Fr. phys. Techn. I, 2, Fig. 3292 3295 [I, Fig. 457 

 to 460]). This is a Rotary Steelyard Dynamometer, being arranged between the driving 

 machine or shafting and the work machine by a belt drive, so that readings can be 

 taken by a jockey weight after deducting for the tensile force of the belt. 



1. 2. 



s. d. 



.~>l,77ii. Band Brake (Braner'g), for efficiency measurements, with automatic arrangement 

 for reducing the tension on the band brake when the friction is over great (Fr. phys. 

 Techn. I, 2, Fig. 3289), Figure .' . 9. 0. 



Cl. 



4092. ,V.i.i 



5593, 



