No. 5184:1. 



Composition of Forces. Projectile Apparatus. 



263 



51 838. 1 : 10. 



a 



51 839. 1 : 5. 



51 843. 1 : 14. 



51,839. Projectile Apparatus (Haiti's), with spring, for fixing to the wall, Figure (Ztschr. 

 f. d. phys. u. chem. U., 2, 1888/89, p. 81) 



5I.S40. Fall Pistol (Projectile Pistol), Hartl's, Figure, for holding in the hand (Ztschr. 

 f. d. phys. u. chem. U., 7, 1893/94, p. 246; Fr. phys. Techn. I, 2, Figs. 3173 and 

 3180; M. T., p. 63) . . . 



51.841. Pistol, Target and Stand, with Rubber Ball, as suggested by Grimsehl, Figure, for 

 studying the trajectory (Ztschr. f. d. phys. u. chem. U., 17, 1904, p. 265) 



As to the employment of the pistol for determinations of mass, see No. 51,770, p. 252. 



51.842. Apparatus (Hagenbach's), Figure, for explaining the influence of the angle of 

 elevation on the horizontal range (W. D., p. 80 [72]) 



The curves of the projected body are demonstrated by pendulums rorn^ponding to the lengths 

 1. 4, 9, 16, etc., these pendulums being fixed to a rod at equal distances apart. The rod can be rotated 

 in a vertical plane and forms a variable angle with the divided horizontal bar, the angle being read 

 off on a graduated arc. 



.">M43. - idem, with diagrams ready drawn for angles of elevation of 0, 15, 30, 45, 

 60 and 75, Figure... 



The diagrams can, contrary to the illustration, be rolled together, so that the apparatus can 

 easily be moved about, occupying but little space when folded up. 



s. d. 

 0.18.0 



0. 6.0 



2. 5. u 



1.10. o 



3. 0.0 



Cl. 



W, 4TL', 47:t. 



