184 APPLIED MECHANICS 
174. Tests of Lead-Tin Alloys.—The results of tests on the tenacity 
and extensibility of alloys containing different proportions of lead and tin” 
_ are shown plotted in Fig. 257.* 
s 10,000 er 
> Pts RK 
& 8000+ ily. Bs 7/30 & 
yy 6,000 Vv ae Nd 20 
| Ack | A ee : 
H 4,000 / = a gs *‘Sicse ANS Zon. : 10 
S S34 
Tin 
0 0 
ay 0 0 20 30 40 50 60 70 80 90 100 
cent 1100 90 80 70 60 50 40 30 2 0 O 
Fig. 257. 
175. Tests of Alloys of Aluminium and Copper.—The eighth report 
to the alloys research committee of the Institution of Mechanical Engineers 
by Professor H. C. H. Carpenter and Mr. C. A. Edwards contains a large 
amount of information on the properties of alloys of aluminium and 
copper. Some of the results of the tests made will now be given. For 
further particulars the student is referred to the full report.t 
The results of tensile tests of specimens cast in sand moulds, and of 
specimens cast in thick cast-iron moulds, are given in the following 
table :— 
Sand Castings. Chill Castings. 
Alumin- a 
Alloy. 
5 ium. Yield Point) Ultimate | Plonga- lyicia-Point| Ultimate —< 
: Stress. Stress. Aint oie Stress. Stress. 2 inches. 
No. Per cent. ~ wey a hie Per cent. igri na gh cs Per cent. 
1 0°10 Be 11:5 46°0 4°1 11°53 46:0 
2 1-06 3:0 13°4 52°0 5:2 11°8 53:0 
3 2°10 3-4 13°5 53°5 4:5 i bs ia 54°5 
4 2°99 3°8 14°5 60:0 6°8 13°8 60°0 
5 4°05 3:5 16°7 83-0 4:9 Bs By | 82:0 
6 5:07 4°3 18°1 75:0 fh | 181 60°5 
7 5'76 4°8 17°8 67:0 6:0 18°8 61:0 
8 6:73 4:8 18°65 eH .§ 19-96 69:0 
9 7°35 6°6 Dats 71°0 .§ 21°58 84:0 
10 8°12 be i 24°91 58-0 9°7 27°47 62:0 
11 8°67 9°8 28:1 48:0 .§ 80°8 55:0 
12 9°38 9-7 30°38 36°2 10°5 33°98 43°5 
13 9-90 11:3 31:70 21°7 12°4 36°93 30°5 
14 10°78 14:1 29°52 90 16°9 36°73 9-0 
15 11°73 14:0 25°43 5:0 14:8 30°63 6:0 
16 13:02 19°75 19°75 1:0 25°06 25°06 nil. 
The stresses are given on the original area. 
** Proceedings of the Institution of Mechanical Engineers, 1897, Plate 4. 
t Ibid,, 1907, { Could not be measured. § Not taken. 
