128 Mr. Rennie’s account of experiments. 
centre round which it moved had a square hole made to 
receive the end of the bar to be twisted. The lever was 
balanced as before, and a scale hung on the arched head ; 
the other end of the bar being fixed in a square hole in a 
piece of iron, and that again in a vice. The undermentioned 
weights represent the quantity of weight put into the scale. 
May 30th , 1817. 
On twists close to the bearing, cast horizontal. 
No. lbs. oz. 
58 ^ in bars, twisted as under with 10 14 in the scale. 
59 i do. bad casting - - 8 4 
60 | do. - - - 10 11 
average 9 15 
Cast vertical. 
61 i -• “ - 10 8 
6 2 | - - - 10 13 
63 \ - - -1011 
10 10 
On different metals. 
64 Cast steel 
65 Shear steel 
66 Blister steel 
67 English iron, wrought 
68 Swedish iron, wrought 
69 Hard gun metal 
70 Fine yellow brass 
71 Copper, cast 
72 Tin 
73 Lead - 
17 9 
17 1 
- 16 11 
10 2 
- 9 § 
5 o 
4 11 
4 5 
1 7 
1 o 
