J^eel 



educ 

 3f At 

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64-C 

 60-1 



42-3 



54-'s NOTES. 



w A' '^'"'l ^^'t'^ l^y Professor Kennedy were made with a lever machine • those 

 42.g.y the author with a liydraulic machine made by Sir Joseph Wliitwoith. 



.,-fh'>,S°r°'*°°'*l^'^' *,^^ *^'*' "^^^^ ^y Professor Kennedy were made on bars 

 _vith holding parts only -03" larger than that under stress. The bars were 



^^■'indZt:^rJ^^'' '? '"'TK''' '^' ''^''''^- ^° t^^° ^Pecimensfhis occu red! 

 Hnd the result of these two tests can hardly be considered complete. 



>v h;J" tbe Whitworth machine 'permanent set' is usually readUy observed 

 £ the 'give' of the hnger on dial; but to be quite sure on this point the 



aacl^ne at^u^o.,?"" °^i ^'''' '''^ ^^""^'""^ ^^"-^"i '^ ^ Whitworth Sur n| 

 _aachine at successa-e aud increasing stresses, until the permanent set was dis- 

 2g.^overed by an actual increase in tlie length of the test-bar. 



'^^'lletomet'er:-"'"^^''^"''' °^ °''''' substances determined by Mr. Turners 



1 



8 

 15 

 21 



21 to 24 

 36 

 60 

 72 



Under test 

 20 to 3G 



am o. 



5U 



•a 



•9 



oke' 



brea 



1» 



