Baehe.] 1^2 [May 4, 



body falling freely near the surface of the earth, for the distance of 

 16.1 feet. As the moving energy of his mass would be com- 

 pounded of the mass multiplied by the velocity with which it 

 travels, it would follow that the shock at the end of 16. i feet 

 (which would take place in a second) would possess the momentum 

 represented by multiplying 190 pounds by 32.2, or 6118 pounds. 

 One, therefore, perceives from the diagram that if, for a weight of 

 190 pounds, a momentum of only about twice 3000 pounds is gen- 

 erated by gravity in a second, with a velocity twice as great as a 

 boxer'' s blow (as it would be, if the velocity of the boxer's blow at 

 the rate of four feet in a quarter of a second be here correctly 

 rated), it is already demonstrated that a man of 190 pounds could 

 not strike a blow of 3000 pounds, unless he could put his whole 

 weight into it, when, for 4 feet, at the rate indicated, it would be 

 190 pounds multiplied by 16, or 3040 pounds; and putting his 

 whole weight into it is impossible. But it is worth while to pursue 

 the subject a little further. 



Remembering what has just been remarked as to the momentum 

 generated by the fall of a mass of 190 pounds during the first sec- 

 ond of time from a state of rest, we must now, in order to make safe 

 comparisons between conditions that are only analogous, not iden- 

 tical, begin by recognizing formally the fact that a man cannot 

 deliver a blow involving the conditions of delivery in a second, over 

 a distance of 16. i feet, and with an acquired velocity of 32.2 feet. 

 The distance concerned, to say nothing of the other differences, 

 precludes direct comparison between the rate of the man striking 

 and the rate due to gravity. We must therefore institute the com- 

 parison and come to a conclusion indirectly. The longest distance 

 over which a tall man can deliver his average blow is about 4 feet. 

 A man with abnormally long reach, like the present boxer, 

 Jackson's, can deliver it over 4.5 feet without changing his footing. 

 If a man delivers it 4 feet in a quarter of a second (and this I think 

 from observation the best boxer can do), he delivers it with the 

 velocity with which gravity would have affected any mass in the 

 first second of time from a state of rest, that is, with a velocity of 

 8 feet for the half second, or 16 feet per second. 



If a boxer strikes four feet in a quarter of a second, of course he 

 strikes at the rate of 8 feet in half a second, that is to say, he 

 strikes with the same velocity as that due to acceleration from grav- 

 ity during half a second. There is, however, in this case, no ques- 



