Revolving about Fixed Axes. 



269 



floor to be connected with a tin tube for containing shot or some 

 other weight. The cords are brought over the pulleys p, p, p, p, 

 Fig. 3j at the centre, and secured to the dishes d, d, d, d, weigh- 



Fig. 3. 



ing one pound each, and moving, with very httle friction, on Httle 

 wheels adapted to the strips or rails r, r, r, /'. By connecting this 

 table with wheel-work, having bands or teeth acting on the hol- 

 low cylinder as a spindle, by means of a weight or power sus- 

 pended by a rope wound round an axle, and moving ve7y slowly, 

 a certain number of revolutions in a minute will be given to it 

 by the power, in passing through a given space, and the four 

 dishes will raise, by their centrifugal force, a weight in the tube 

 below, proportionate to the velocity and their distance from the 

 centre. If the moving povjer be then doubled, with a slight ad- 

 dition to overcome the additional friction and atmospheric resist- 

 ance, it will be found, that in moving through an equal space in 

 the sam,e time, it will give twice the former velocity, and the 

 dishes, at the same distance from the centre, will raise in the tube 

 below, in an equal time, quadruple the iveight first raised. Then 

 by loading the dishes and increasing or diminishing the velocity, 

 and varying the distances of the dishes from the centre, a variety 

 of experiments may be made, and weights may be raised, with 

 corresponding distances and velocities proportionate to those given 

 above. 



By observing the manner of performing the experiments with 

 the magnetized bar, it will be seen that a centrifugal force is ex- 

 cited, INDEPENDENTLY OF THE PROJECTILE FORCE, equal tO the 

 Vol. XXXIX, No. 2. — July-September, 1840. 35 



