S5 
> Minimum =0'024 inch. 
226 ME. W. EAIEBAIEN AKD ME. T. TATE OX THE I\IECHAXICAL PEOPEETIES 
the inch and reading on a graduated head to ,^th of an inch, the tninhnnm thickne 
was assumed as that of the part which ruptured, and has been emplored ui reducing 
'"'Tt must also be ohserred that the globes were usually slightly elliptical, in soiue cases 
seriously so; the vertical diameter, id (using the same form of expression as before), 
being genemlly less than the horizontal, a o. In the following Tables the two diameters 
are given in each case. 
Flint-glass. 
Experiment 1. 
Glohe a. Diameters 4-0 and 3-98 inches. 
In parts of an incli. 
0-0230 
0-0256 
0-0284 
I 
Thicknesses measured •< 0-0244 
0-0302 
0-0250 
. 0-0240 
Bursting pressure =84 lbs. per square inch. 
Experiment 2. 
Globe b. Diameters 4-0 and 3-98 inches. 
In parts of an inch. 
r 0-034 
0-032 
0-031 
0-0254 Minimum =0-025 inch. 
0-0256 
0-031 
.0-028 
Bursting pressure =93 lbs. per square inch. 
Experiment 3. 
Globe c. Diameter 4-0 inches. 
In parts of an inch. 
0-040 
0-0406 
0-039 > Minimum =0-038 inch. 
0-039 
.0-038 
Bursting pressure =150 lbs. per square inch. 
Thicknesses measured 
Thicknesses measured < 
