STRENGTH OP MEN AND HORSES. 



23> 



To find the strength that each of these men might exert to 

 raise a weight vertically, I made the following experiments : 



I took various weights, increasing by lOlbs. from 150lbs. Expcri- 

 up to 250lbs. All these weights were of lead, having circular on t j ie j r p 

 and equal bases. To use them with success in the proposed strength* 

 experiments, I had at the same time a kind of bench made, in 

 the middle of which was a hole of the same size as the base 

 of my weights : this hole was shut by a circular cover, which 

 effected this purpose when pressed against the bench, but at 

 other times was kept at about the distance of a foot and a half 

 above the bench, by means of a spring and some iron bars. 

 To prevent the weight with which this cover was loaded during 

 the experiment, from forcing down the cover lower than the 

 level of the surface of the bench, I had several grooves made 

 in the four iron bars, which sustained the cover at any height 

 at which it might arrive by the pressure of the springs, as soon 

 as the pressure of* the weight ceased. 



After having laid the ]50lbs. on the cover, and the other in raising 

 weights in succession, increasing by lOlbs. up to 250lbs. I vphyIShV 

 made the following experiments with the men whose size and 

 weight are given above, by making them lift up the weights as 

 vertically as possible all at once, and by observing the height to 

 which they were able to lift them. The following iable gives 

 the heights observed for the different weights marked at the 

 head of the table. 



vertically, 



This table proves to us, that the size of the men employed Results, 

 to raise the weights vertically, has considerable influence on the 

 height to which they severally brought the same weight. We 

 find also by this, that the height diminishes in a much mor© 



R 2 con- 



