ON STRENGTH AND PROPERTIES OF CAST IRON. 341 
of iron in which they were inserted. See fig. 
where A and B represent the bolts, with the 
prism C betweer them, and D E the block of 
iron. During the experiment the block and 
bolt B rested upon a flat surface of iron, and 
the rounded end of the bolt A was pressed 
upon by the lever. There was another hole 
drilled through the block at right angles to 
that previously described; this was done in 
order that the specimen might be examined 
during the experiment, and previous to it, to 
see that it was properly bedded. 
_ The accompanying sketch will show more clearly the mode 
of performing the experiment, in which the lever was always 
kept as nearly horizontal as possible. Other apparatus, not 
here shown, were used to lift up or lower the lever during the 
experiments. 
E _ The results are given in the following tables : 
