on the strength of materials. 
Horizontal Castings. 
12 5 
April Qgth. 
Averages. 
lbs. avoirdupoise. 
ri v 1 
4- * 8 
9006 
— X — “ — 
4 * 8 
8845 
< 
-L x 6 . 
4*8 
8362 
i X 1 
4*8 
643° 
Li x 1 or one inch long 
6321 
Vertical castings. 
I yl 
4*8 
9328 
i x A. 
4*8 
8385 
x x f a small defect in the specimen - 7896 
i x 7. 
4*8 
7018 
x | or one inch 
- 6430 
Experiments on different metals. 
4 x \ cast copper, crumbled with 
- 7318 
4 x \ fine yellow brass reduced with 
3213.4- with 10304 
k * £ ' 
wrought copper, - 
3427. 4 6440 
£ x i cast tin, - -% 
552. 4 966 
i x i cast lead, - 
i 4 8 3 
The anomaly between the three first experiments on -| 
cubes, and the two second of a different length, can only be 
accounted for, on the difficulty of reducing such small speci- 
mens to an equality. The experiments on -§• inch prisms of 
different lengths give no ratio. The experiments on £ inch 
cubes, taking an average of the three first in each, give a 
proportion between them and the three on cubes, 
as 1 : 6.096 in the block castings 
as 1 : 7.352 in the horizontal ditto 
as 1 : 8.035 in the vertical ditto 
in several cases the proportion is as the cubes. 
The vertical cube castings are stronger than the horizontal 
cube castings. 
