OTHER PROPERTIES OF CAST IRON. 27] 
gives the mean breaking weight at 971.6lbs. 
Rondelet, according to Tredgold, presents the 
most anomalous results. In two experiments 
on bars 1.066 inches square, and 3.83 between 
the supports, the breaking weight is given at 
482lbs. And, in four other experiments (on 
bars the same size and the same distance be- 
tween the supports) the results are 700, 1140, 
375, and 605, giving 705lbs. as the mean of the 
breaking weights. Again, on four other experi- 
ments, on the fractured parts of the same bars, 
at half the distance, or 1.915 feet between the 
supports, the differences are still greater, being 
580, 1063, 1770 and 1360, mean 1193: or, 
596.5lbs. as the breaking weight, when the bars 
are reduced to 3.83 feet between the supports. 
The great discrepancies which thus exist in 
Rondelet’s experiments, render them unfit for 
the purpose of comparison with our results. 
The other experiments referred to were made 
on bars 1 inch square, broke on supports 3 feet 
asunder. ‘Their results are as follows: 
Banks from 3 experiments...........-+ 971.0lbs. 
Reynolds “ 2 CRAM eet teae r= oe ¢ 755.5]bs. 
Rennie “ 2 ie OP ee, ates wa 869.0]bs. 
