366 
Mr A. J. Avte on the Expansion of Stone 
rough as it came from the mould. The other rod was also half 
an inch square, but was cut out of the centre of a bar of the 
same iron cast two inches square, in order to get more nearly the 
rate of expansion of a large mass. 
In the Table, the substances are arranged in the order of their 
rates of expansion, that which expands most being placed first. 
1 
TABLE or THE EXPANSION OF STONE, &c. 
- Roman cement, 
. Sicilian white per 
Ly 
. Carrara marble, 
. Sandstone from the) 
liver rock of Craig- f 
leith Quarry, . . 
. Cast-iron from a rod 
cut from a bar cast 
two inches square, 
. Cast-iron from a rod | Y 
cast half an inch sq. 
. Slate from Penrhyn 
Quarry, Wales, 
j 
. Peterhead red granite, } 
. Arbroath pavement, 
. Caithness pavement, 
. Greenstone from Ratho, 
. Aberdeen grey granite, 
. Best stock brick, 
. Fire-brick, c 
. Stalk of a Dutch 
bacco-pipe,. . + 
. Round rod of Wedge- 
wood-ware (11 inches 
long) Waceheiy ase 
. Black Marble from 
Galway, Ireland, . 
to- 
\ 
Decimals of an 
Inch on 23 
Inches, for 
180° F. 
0330043 
“0325392 
0253946 
0274344 
‘0150405 
*0270093 
0263755 
0253498 
0238659 
0220416 
0206266 
-0206552 
-0205788 
“0186043 
01815695 
0126542 
-01135384 
‘0105177 
0102394 
Decimal of 
Length for 
180° F. 
0014349 
“0014147 
00110411 
0011928 
0006539 
‘00117438 
-00114676 
-001102166 
-0010376 
-0009583 
-0008968 
-0008985 
-0008947 
-0008089 
-00078943 
*0005502 
0004928 
-0004573 
*00045294 
*00044519 
Decimal of 
Length for 1° 
F. 
Whenthe rod contained 
-0000075 more moisture it ex- 
panded more. 
-0900078 From first experiment, 
when moist. 
00000613 | Mean of three experi- 
ments, when dry. 
-00000662 From first experiment, 
when moist. 
-60000363| 4 Mean of two experi- 
ments, when dry. 
00000652 do. 
Mean of four 
-00000637 Mean of two do. 
‘00000612 | Mean of two do. 
-00000576 Mean of three do. 
-00000532 ‘a first experiment, 
when moist, 
00000498 Mean of two do., 
(when dry. 
-00000499 | Mean of four do. 
-00000457 | Mean of three do. 
-000°0449 |Mean of three do. 
-00000438 | Mean of two do. 
‘00000306 | Mean of two do. 
-00000274 | Mean of two do. 
-00000254 | Mean of three do. 
:00000251 | Mean of two do. 
-00000247 | Mean of three do, 
