270 INQUIRY INTO THE STRENGTH AND 
Banks in his treatise “On the Power of - 
Machines,” made some few experiments on bars 
one inch square, but as they appear never to 
have been reduced to thatstandard, either by cal- 
culation or otherwise, we may reasonably infer, 
from the increase which takes place in casting 
from models, that they would be rather larger in 
size than intended,and consequently, give greater 
results. This seems to be the case in almost every 
instance where the necessary precautions are 
not observed, and the bars uniformly reduced to 
the dimensions indicated in the experiments. 
Tredgold in his Essay on the Strength of Cast 
Iron, gives the experiments of Banks, Rondelet, 
Ebbels, Reynolds, &c. To these he adds some 
of hisown; but they are not applicable for com- 
parison with ours, as the writer had different 
objects in view, and never broke the bars. 
Those of Banks, Rondelet, Reynolds, and some 
well conducted experiments by Mr. Rennie, 
recorded by Frofessor Barlow, are however en- 
titled to consideration. 
Banks in four successive experiments on 1 
inch square bars, 3 feet between the supports, 
and the weights suspended from the middle, 
