Fall Machines. Inclined Planes. 



257 



51802. 1:21. 



51803. I :30. 



51 798. 1 : 8. 



51804. 1:17. 



51.799. Acceleration Apparatus (Bendtorff's), combined with an Atwood Fall Machine (School 

 Science and Mathematics, Vol. VIII, No. 3, March 1908, p. 228) 



A falling tuning fork (indicating) records its vibrations on a sooted glass plate. The glass plate 

 is capable of lateral motion so that a number of curves can be described on it in succession. The 

 apparatus is supplied with the accessories which are necessary when it is used as a fall machine. 



51.800. Tension and Acceleration Meter (Hrabowsky's) (Ztschr. f. d. phys. u. chem. U., 9, 

 1896, p. 24; Fr. phys. Techn. I, 2, Figs. 3165 and 3166), for graphically demonstrating 

 accelerated motion, for demonstrating the laws of fall, accelerated motion on a horizontal 

 path, equable motion, final velocity, and retarded motion 



51.801. Poggendorff's Balance (Fall Machine) for determining the force necessary for accele- 

 rating a body (Fr. phys. Techn. I, 2, Fig. 3275) 



51.803. Inclined Plane (W. Konig's), Figure (Ztschr. f. d. phys. u. chem. U., 7, 1893/94, 

 p. 4), with 45 mm diameter lignum vitae ball 



The inclined plane comprises 4 pieces each 1 m long, which can be inserted one in the other, 

 and 1 piece 0.5 m long. A number of wood blocks, supplied with the apparatus, serve to give the 

 plane different inclinations or to set it up "broken", i. e., with the lower part horizontal. Rotary 

 flags on small stands render the passage of the ball through certain points visible at a distance. 



51.804. Quadruple Inclined Plane (Mach's), Figure, for allowing 4 balls to fall simultaneously 

 (Meyer, Naturlehre, Fig. 107, 4 th Edn.) 



Four sliding fillets are supplied with the apparatus so that each ball can be stopped at any 

 desired point. 



CI. ?.:>7f>. 



3299, 



462, 4745. 



S. d. 



9. 0.0 



5.10.0 



1.10.0 



51,802. Galilei's Inclined Plane for the descent of bodies (as suggested by Bertram), Figure, 



1.90 m long (Fr. phys. Techn. I, 2, Fig. 2235, 2236), with variable angle of inclination 1. 



8.0 



3. 0.0 



2.15.0 



17 



