on a new Friction Sledge for stopping Railway Trains. 



227 



Table (2). — Calculated Results. 



The velocity v' at the point X is found from the formula 



v'- = 2fs = -9302 5, 



s denoting 00"; and from v' and s the remainbg quantities are calculated as 

 before. 



Fourth Series. 

 March 5, 1850. — Fine day. 



tons. cwls. qrs. lbs. 



Weight of waggon = 2438. 

 Weight of sledge = 4 3 21. 



The velocity of impact was determined as in third series. 

 Table (1). — Original Meastjeements. 



Note.— The point in these experiments is 20 feet above the sledge. 



VOL. XXII. 2 H 



