Mr. Rennie’s account of experiments 
13° 
No. 
Weight in scale. 
90 Swedish iron 
- 9 8 
91 Hard gun metal 
- 5 0 
92 Fine yellow brass 
4 11 
93 Copper - 
- 4 5 
94 Tin 
1 7 
95 Lead - 
1 0 
Remarks. 
Here the strength of the vertical bars still predominates. 
The average of the two taken conjointly, and compared 
with a similar case of \ inch bars, gives the ratio 
as was anticipated. 
as the cubes, 
In the horizontal castings of different lengths 
, the balance 
is in favour of the increased lengths ; but in the vertical cast- 
ings, it is the reverse. In neither is there any apparent ratio. 
In the horizontal castings at 6 inches from the bearing, there 
is a visible increase, but not so great as when close to the 
bearing. 
June 4 fh, 1817. Miscellaneous experiments on the crush of one 
cubic inch. 
No. 
lbs. avoirdupoise. 
96 Elm - 
- I284 
97 American pine 
1606 
98 White deal 
1928 
99 English oak, mean of two trials 
3860 
100 Ditto, of 5 inches long, slipped with 
2572 
101 Ditto, of 4 inches do. 
5147 
102 A prism of Portland stone 2 inches long 
805 
103 Ditto, statuary marble 
321 6 
104 Craig Leith - 
8 688 
