IHAVIOUR OF MATERIALS IN TESTING MACHINE 187 
Ultimate Tensile Strength in Tons per Square Inch. 
. 8] Aluminium, cast. met 
> ae - rolled 8 
28 | Delta metal, cast 20 
30 ds rolled . 30 
i: ‘ 80 | Manganese bronze, cast . 25 
1 10 = pe rolled . 30 
4 ” rolled or forged . 14] Muntz metal stake 22 
ae wire, annealed .  . 18) Navalbrass.  . : 24 
Brass, cast - + + + 11 | Phosphor bronze, cast. 16 
4 * im 1) . . . . 20 Leat er . % . . . 2 
| Gun-metal or bronze . «=. «14 | Timber. « «© «© + « 6 
Ultimate Shearing Strength in Tons per Square Inch. 
Feasicon 4 . . 12 | Gun-metal. - ~ AS 
j. Wrought-iron, across fibre . . 19 | Yellow pine, across fibre . ae 
f 9° » along fibre . é30 » along fibre . 3 
‘steel .. . : . - 22 Oak, across fibre. ‘ ee 
a ; P F A, » along fibre 
Modulus of Elasticity in Tons per Square Inch. 
Direct. Transverse. 
(E.) (C.) 
> 7 . é é 2 . 6,700 2,600 
d ; F , 4 ; 13,000 5,200 
7 13,400 . 5,500 
2 5,500 2,100 
w ; 6,700 2,500 
Y 5,600 2,200 
z 5,600 2,200 
phor bronze 6,100 2,300 
: 700 270 
Exercises XI. 
«In a tensile test of a wrought-iron bar, the following observations were 
on : W=load in tons, «=extension in inches in a length of 8 inches, 
-d=smallest diameter of bar 
; ninches. 9°24 was the load : lq : ; 7 
at the yield point, 13-6 was WwW ©. }9:24°|11°94 |13°21. | 13°60 | 12-78 
a) 2 maximum load, and 12°78 | x 0 |0:175 | 055 O975 | 1°56 | 2°45 
a velne ot (07175) was | @ [0°S81 [0872 | 0-854 | 0833) 0-809] 0628 
1e end of the “yield,” |— ;, 
‘and the nominal stress (load + original area), also x and the actual stress 
+actual area of least section). Scales.—Stresses, 1 inch to 5 tons per square 
h ; #, 24 times full size. 
