COMPRESSIBILITY OF GLASS. 595 
TABLE I1.—continued. 
Pressure, _ |Pressure. Expansion in Manometer 
Reading of [Divisions Divisions. 
Manometer poe Length of Glass Rod : : 75:05 inches. 
Series. No. 2. No. 2 Diameter of do. . : é On285 
ae East West Total. Weight of do. . r : 209°5 grammes. 
End. End. 1 Division of Macrometer . : =0°000417” 
(A, = As) B+O= 
ill iy B C 
69°8 |} 12-4 | 57-4 15 10% 32 Date, 4th June 1880. 
69°8 | 12°6 | 57:2 32 0 32 Temperature (Centigrade) 12°5° 
69°7 | 12°6 | 57-1 27 4 31 Number of observations Ace 8 
69°5 | 12°8 | 56°7 19 13 32 Pressure in atmospheres Ax313 | 177 
Iv, |69°8 | 13:1 | 56-7 19 13 32 Linear compression 0:000417D | 0:01334 
mood | la | 561 20 12 32 10° 
H 
ee 1:002 
12 
3K 3-006 
Do. do. per atmosphere 
Cubical compression, per 
10° per atmosphere 
76°3 | 13:3 | 63-0 27 9 36 Date, 7th June 1880. 
Hore | 138) | 61-7, aly: 18:5 | 35:5 | Temperature (Centigrade) 
76°8 | 13°8 | 63:0 18 18:0 | 36 Number of observations ee 
77:0 | 139 | 63:1 18 18-0 | 36 Pressure in atmospheres Ax sls: WloT 
wy er 0 | 14-0 | 63-0 15 20:0 | 35 Linear compression . 0:000417D| 0:1475 
776 | 14:0 | 63°6 17 19:0 | 36 
A 
P 
F 
H 
K 
N 
Y 12:5" 
Ie 
F 
— 106 
77:0 | 14:0 63:0 16 18-0 34 Do. per million a) ceed i8l 75-OBY 0'1966 
K 
N 
a 
? | 
F 
lal 
K 
N 
10 
77°3 | 14:0 | 63:3 16 18:5 | 34:5 H 
rr | tA | 63-0 16 20:5 | 36-5 | Do. do. per atmosphere Pp 0-998 
77-1 114-1 | 63:0 14 20°5 | 34°5 | Cubical compression, per = SoA 
62-97 35-39 10° per atmosphere 
43:0 | 8:2 | 34:8 {10 8 18 | Date, 7th June 1880. | 
42°9 | 83 | 346 |12 6 18 Temperature (Centigrade) 12-2° 
43:0 | 86 | 34:4 |14°5 3 17:5 | Number of observations ae ia 
43°6 | 87 | 34°9 {14:0 + 18 Pressure in atmospheres Ax313 | 109 
= 43°38 | 8-9 | 34°9 [14:5 3 175 | Linear compression . 0:000417D)} 0:00753 
VI. |43°8 | 8-9 | 34:9 |11°5 5-5(—)| 17-0 aN 10° 
43°8 9:0 | 34°8 111-0 7-0 18 Do. per million . 75-05 100°3 
44:2 | 9-0 | 35:2 |10-5(+)} 8-0 185 H 
44-0 | 9-1 | 34:9 ae ) 9-0(+)} 19 Do. do. per atmosphere Pp 0:924 
439 | 9:2 | 34:7 | 9:0 10:0 19 G@upicalicom : 
; i a pression, per 779 
44-0 | 9-2 | 34:8 | 9-5 85 18 10° per atmosphere \ 3K 2-772 
34°81 18-05 
~ (594 | 92 | 502 | 115) 44 | 255 | Date, 7th June 1880. | 
59°38 | 9°3 | 50°5 18 8°5 | 26:5 | Temperature (Centigrade) | T 12°3° 
60°0 | 9°6 | 50-4 16 LE 27 Number of observations “8 10 
59°2 | 9°8 | 49-4 12 15°5 | 27-5 | Pressure in atmospheres | P | Ax3:13 | 157 
60:0 | 9°8 | 50:2 12 15°D | 27°5 | Linear compression. . F |0:000417D| 0:01126 
VII. | 59-9 | 9:9] 500 | 12 14 | 26-0 es 1 
60-4 | 9:9 | 505 | 16 | 11:5 | 27-5 | Do. per million . Ho | 7505 |120° 
60:0 | 10-0 | 50:0 16 12 28-0 
61:0 110-0 | 51-0 1s 125 | 97-5 | Do. do. per atmosphere K = 0:957 
60°8 | 10:0 | 50°8 U 20 27 Cubical compression, per \ N 3K 9-87] 
10° per atmosphere 
