240 
ME, W. FAIBBAIEN AND ME. T. TATE ON THE 5IECHANICA1 PEOPEEIEES 
Table Vl.-Summary of the Results of Experiments upon the Resistance of 
Glass Globes to an External Pressure. 
Number of 
1 experi- 
\ ments. 
Description of glass. | 
Diameters, in inches. 
Minimum 
thickness, 
in inches. 
Collapsing pressure 
per square inch, 
in lbs. 
' I 
! li. 
! III. 
1 IV. 
V. 
! VI. 
; VII. 
' VIII. 
IX. 
X. 
;> Flint-glass ...<| 
5‘05 and 4*76 
5’08 and 4*7 
4*95 and 4*72 
5- 6 
8-22 and 7’45 
8-2 and 7’2 
8*2 and 7’4 
4‘0 and 3‘98 
4-0 
6- 0 
0-014 
0-018 
0-022 
0-020 
0-010 
0-012 
0-015 
0-024 
0-025 
0-059 
292 
410 
470 
475 
35 
42 
60 
( 900 )* 
( 900 )* 
(1000)* 
i XXIII. 
Green glass 
5*0 and 5*02 
0-0125 
212 
Table VII. — Summary 
of Eesults of Experiments on the Resistance of Glass C^lindei 
to an External Force. 
Number of 
experiment. 
Description of glass. 
Diameters, 
in inches. 
L.ength,in inches.j 
Minimum 
thickness, 
in inches. 
Collapsing pres- 
sure per square 
inch, in lbs. 
XI. ■ 
XII. 
XIII. 
XIV. 
XV. 
XVI. 
XVII. 
XVIII. 
XIX. 
XX. 
XXI. 
XXII. 
>. Flint-glass ...-“y 
3-09 
3-08 
3- 25 
4- 05 
4-05 
4-06 
4-02 
3- 98 
4- 05 
4-20 
4-10 
4-15 
14-0 
14-0 
14-0 
7-0 
7-0 
13- 8 
i 13-8 
14- 0 
7-0 
22-0 
21- 5 
22- 0 
0-024 
0-032 
0-042 
0-034 
0-046 
0-043 
0-064 
0-076 
0-079 
0-055 
0-051 
0-046 
85 
103 
175 
202 
380 
180 
297 
382 
(500)f 
120 
129 
1 125 
* These globes remained unbroken. 
f Eemained unbroken. 
