220 ME. W. EAIEBAIEN AND ME. T. TATE ON THE MECHANICAL PEOPEETEES 
Experiment 9. 
Diameter 0’79 inch,. 
0-4901 square inch. 
Height 2-0 inches. ^ 
Sustained a weight of 18,634 lbs. = 38,015 lbs. per square mch, _ 
without being crushed. At this point the deflection of the lever was so great, that u 
was considered dangerous to proceed. On removing the specimen to a heavier m er i 
crushed with a force of 12,000 lbs. The larger weight, however, had been tair y p- 
Crown-glass Cylinders. 
The two cylinders of crown-glass were slightly rounded towards the edge of the bear^ 
ing surfaces, which reduced the area directly subjected to the crushmg orce. t n 
therefore probably most accurate to take the less area in reducmg the results. 
Experiment 10. 
[0*72 inch at middle. 
Diameter lo-68 inch at ends. 
0-363 square inch. 
Height inch. ^ 
Crushed suddenly with 14,100 lbs. =38,825 lbs. per square inch. 
Experiment 11. 
JO- 80 inch at middle. 
Diameter lo-76 inch at ends. 
square inch. 
Height inch. ^ 
Crushed suddenly with 10,516 lbs.=23,181 lbs, per square mch. 
Arranging the above results together, we obtain the following general Table of the 
results of the experiments : — 
Table Il.-Summary of Results of Experiments on the Resistance of Annealed Glass 
Cylinders to Crushing. 
Description of glass. 
Height of 
cylinder, 
in inches. 
Area of cylinder, 
in inches. 
Weight Crushing weight, 
causing fracture, ■ p,s. 
in lbs. 
1 
Weight per sq. in. 
to cause fracture, 
lbs. 
Weight per sq. in. 
to crush, 
lbs. 
Flint-glass 
1 
1-00 
1-00 
1-60 
2-05 
0-555 
0-374 
0-541 
0-363 
9,225 
11,465 
13,033 
13,033 
11,241 
11,913 
16,621 
30,661 
23,483 ! 
34,854 
20,775 
32,803 
Green glass 
1-00 
1- 50 
2- 00 
0-466 
0-454 
0-490 
6,933 
8,126 
10,516 
15,891 
18,634 
14,888 
17,883 
22,583 
35,029 
38,015 

Crown-glass | 
1-0 
1*5 
0-454 
0-363 
10,516 
14,100 

23,181 
38,825 
— 
