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ON STRENGTH AND PROPERTIES OF CAST IRON. 373 
Having now subjected the irons which are tried in this paper 
to a variety of strains, and given the results under their pro- 
per heads, a summary of the whole will be added, with remarks 
to show the general bearing upon the question of Hot and Cold 
Blast Iron. 
Recapitulation. 
Taking only the means from all the experiments in the present 
paper, and attaching to each value a number, in a parenthesis, 
indicative of the quantity of experiments from which it has 
been derived, we have as below :— 
Carron Iron No. 2. 
Rati : 
Cold Blast. | Hot Blast. | Cold Blast by 1000 
Tensile strength in Ibs. per 
Square inch........s.ceceeeeeees } Aes (2) 13505 (3) | 1000: 809 
Compressive strength in lbs. 
per inch from castings torn 106375 (8) | 108540(2) | 1000 : 1020] x 
ASUNGET »..seeeeeeeeeeneeee tenes = 
room prisms of cata 100631 (4) | 100738 (2) | 1000 : 1001 5 
Do. from cylinders ..........s.08 125403 (13); 121685 (13); 1000: 970 J a 
Transverse strength from all 
the experiments ..........00 AEN (he eee CLD) soetseens (13) 1000 : 991 
‘| Power to resist impact .....ccscc0.|  ceseecees (Diane saneoes (9) | 1000 : 1005 
Transverse strength of barsone 
inch square in Ibs............. aT Ke) 463 (3) | 1000: 973 
Ultimate deflection of do. in in.| 1:3138(3) | _—_-1387 (3) | 1000 : 1018 
Modulusof elasticityinlbs. per 
square inch .........00. saneanes } 17270500 (2) |16085000 (2) | 1000: 931 
Specific gravity ...... HS Peper 7066 7046 1000 : 997 
Devon Iron No. 3. 
Ea ESE TMS a BEN EP Da ae Ne A 
Tensile strength ......... Sepneses|caerscens sesseeeee] 21907 (1) 
Compressive strength ......sssselecceecsscessceesen 145435 (4) 
Transverse ditto from the ex- 
Beats ne } hae Giikeeten: (5)| 1000 : 1417 
Power to resist impact ..... see-es|eoecee neha (A) |esseeeeeeees (4) | 1000 : 2786 
Transverse strength of bars 
One inch square ...........006 } HAS (2) 537 (2) | 1000 : 1199 
Ultimate deflection ditto......... 79 (2) 1:09 (2) | 1000 : 1380 
Modulus of elasticity ditto ...... 22907700 (2) |22473650 (2)| 1000: 981 
Specific gravity ............ peat. 7295 (4) 7229 (2)| 1000: 991 
a 
Buffery Iron No. 1. 
ie ar ae Gn he a 
Tensile strength ........ssessesees 17466 (1) 13434 (1) | 1000: 769 
Compressive ditto..........sssssees 93366 (4) 86397 (4) | 1000: 925 
Transverse itt ...ssseccssseecees|eecessveeees (D) faaees Hiektntes (5)} 1000: 931 
Power to resist nay gyitich peeee sec duae (2): [uedabacencns (2) | 1000: 963 
‘Transverse strength of bars 
one inch Wbiiare sialbi salle ABB XS) 436 (3) / 1000: 942 
Ultimate deflection ditto ......... 1:55 (3) 1:64 (3) |, 1000 : 1058 
Modulus of elasticity ditto ...... 15381200 (2) |13730500 (2) | 1000: 893 
Specific gravity .........cssssscasees 079 6998 1000 : 989 
