ON THE PROPERTIES OF CAST IRON. 



89 



minute as to be scarcely perceptible, even when examined with our best in- 



"following tables exhibit the progressive state of the bars from the 

 23rd of June 1838, up to April 19th of the present year. 



Table I. 

 Tible of deflections, as exhibited with permanent weights of 336 lbs., sus- 

 !ilfrnm the centre of bars of cold and hot blast Coed- lalon iron, 

 ^to^eZet^l and left to determine the effect produced on 

 each bar after given intervals of time. 



Distance between the supports 4 ft. b in. 



Experiment I. 



Cold Blast Iron, No. 2. 

 Breadth of Bar... 1-020 

 Depth of ditto ... 1-030 



O ^ 



Date of Observation, 

 1838 to 1842. 



rt O 



Feb. 7, 1839. 

 March 8, ... 

 April 5, 



5, ... 

 15, ... 



7, ... 



9, ... 

 14, 1840. 

 April 27, ... 

 June 6, ... 

 Aug. 3, ... 

 Sept. 14, ... 

 Nov. 22, 1841. 

 April 19, 1842. 



July 

 Aug. 

 Nov. 

 Dec. 

 Feb. 



54° 



35 



38 



72 



63 



50 



39 



50 



63 



61 



74 



55 



50 



58 



EXPERIMEMT 2. 



Hot Blast Iron, No. 2. 

 Breadth of Bar.. .1-020 

 Depth of ditto ... 1-040 



336 

 336 

 336 

 336 

 336 

 336 

 336 

 336 

 336 

 336 

 336 

 336 

 336 

 336 



1-524 



1-532 



1-531 



1-533 



1-532 



1-531 



1-531 



1-531 



1-519 



1-520 



1-523 



1-613 



1-620 



1-620 



■s a 



Results in the preceding table and the previously published report, showing 

 the progressive and increased ratio of deflections, from the 23rd of June 

 1838 to April 19th of the present year. 



Weight on bar 336 lbs. 



Cold Blast 



Iron. 



Deflection in 



inches. 



1-316 

 1-305 

 1-303 

 1-306 

 1-308 



Date of Observation. 



June 23, 1838. 

 July 5, 1839. 

 June 6, 1840. 

 Nov. 22, 1841. 

 April 19, 1842. 



Temp. 

 Fahr. 



78° 



72 



61 



50 



58 



Hot Blast 



Iron. 



Deflection in 



inches. 



Remarks. 



1-538 

 1-533 

 1-520 

 1-6201 

 1-620 J 



Previous to the time of 

 taking the deflection in 

 Nov. and April, the hot 

 blast bar had been di- 

 sturbed. 



