640 
ME. AIRY’S ACCOTJ^’T OF THE COYSTRUCTIOY OF 
Table (continued). 
Description and length of 
Thermometer-reading. 
Change of 
Modulus for 
Modulus deduced 
from the compound 
expansion. 
bar. 
First. 
Second. 
length. 
1° Fahb. 
div. 
37*25 
98-60 
98-60 
177*95 
865-30 
1229*10 
-0000089164 
97921 
j -0000094103 
177*95 
100-42 
1231-50 
100418 
j 95993 
100-42 
38-10 
892-05 
90489 
40-65 
94-05 
782-56 
92643 
j 94914 
Copper bar, 40 inches. < 
94-05 
170-70 
1169-96 
96493 
170-70 
99-66 
1103-22 
98174 
} 94750 
99-66 
43-27 
806-70 
90437 
112-40 
183-45 
1084-72 
96514 
183-45 
99-63 
1302-92 
98267 
1 95547 
99*63 
51-50 
691-38 
90811 
f 
■ 47*35 
99*50 
99*50 
176-27 
752-50 
1164-67 
-0000101356 
106318 
j *0000104456 
176-27 
99-20 
1187-92 
108267 
j 104469 
99-20 
48-70 
710-40 
98811 
50-80 
38-80 
165-65 
96963 
38-80 
99-27 
847-75 
98474 
j 102843 
99-27 
178-45 
1196-92 
106180 
Old Imperial Standard, 
36 inches. 
178-45 
99-87 
99-87 
50-45 
1205-72 
703-70 
107778 
100018 
V 104648 
50-45 
41-50 
130-90 
102733 
J 
52-85 
39-90 
180-45 
97877 
39-90 
97*85 
800-70 
97053 
j 103205 
97-85 
168-70 
1091*75 
108163 
168-70 
99-72 
1057*59 
107693 
1 
99*72 
54-15 
651-06 
100552 
> 103734 
54-15 
37-50 
228-94 
96583 
J 
r 
53-90 
96-60 
96-60 
174-60 
300-95 
584-42 
-00000495 
526 
j -0000051525 
174-60 
97-86 
583 22 
534 
j 51157 
97-86 
49*65 
326-80 
476 
50-00 
38-43 
80-92 
492 
38-43 
99-35 
99-35 
176*02 
412-80 
578-19 i 
476 
530 
j 50591 
176-02 
99*16 
583-02 . 
533 
1 51157 
1 50404 
Glass bar, 36 inches. 
1 
99-16 
51-45 
43-47 
99*20 
382-35 ! 
340-33 i 
482 
501 
99-20 
174-92 
545-67 
506 
174-92 
98-70 
564-93 
522 
1 
55-50 
38-28 
116-34 j 
473 
38-28 
98-75 
416-67 
484 
1 51339 
98-75 
168-93 
538-23 
539 
168-93 
98-67 
529*46 
529 ■ 
1 
98-67 
57-00 
303-20 
511 
y 51938 
57*00 
41-43 
110-10 
497 
i 
It will be remarked that the modulus of expansion, in e^ery instance, is greater for 
the high temperatures than for the Ioav ones. As the same thermometers AA ere used 
throughout, it is possible that this may arise from an error in the graduation of the 
thermometers ; but it is not improbable that it is a real peculiarity in the relation 
between the expansion of the solid metals and that of quicksilver. Admittmg the truth 
