121 



281bs, weight. 



72 65 20'' from top. 



78 ; . . 70 close to top. 



791 711 at bottom. 



81 73 at bottom. 



71bs. weight. 



81 54 at top. 



84 56 at bottom. 



*72 48 at bottom. 



*75 50 at bottom. 



SECOND SERIES. 



281bs. weight. 



54 48 broke at top. 



60 53 J bottom and half way up. 



60 53 J at top. 



63 56 at bottom. 



QG 59 at bottom. 



69 61|- at bottom. 



72 64J at bottom. 



*36 32 attop. 



*48 43 at bottom. 



161bs. weight. 



60 50 half way up. 



66 55 at bottom. 



With one dry leather washer. 



72 60 4'' from bottom. 



66' 55 near top. 



Two dry washers. 



72 60 6'' from bottom. 



Three soaked washers. 



78 65 broke in middle. 



83 69 attop. 



It should be noticed that the formula velocity = /— - 



cannot be depended on except as indicating the general 

 character of the phenomena ; for let us attempt to deduce 



1 F^ 



the heie^ht of fall from this formula, h=^ =^ , 



An inch wire 1 foot long weighs 3'84! lbs., the breaking 

 force in proper units = 80,000 X 32, and the elasticity 

 = 25,000,000 X 32, whence h — 38 feet about. 



This discrepancy I have not yet accounted for. 



