1833.] ‘Expansion of Metals. i 137 
Fifth Series, 24th November. Same Bar. 
‘Ss Thermometers, Micrometer 
5 = 1h. | inserted in the Hour Readings. 
a & chet Bar. of Observations. 
i) - “ mine e é 
z g pipe tthe Sdath Reading. | Divisions. 
co) end. end. H. M. 
1 72,8 72,9 73,2 |1140a.m.| — 906 
2 42:5 72,9 73,3 11143 ,, — 906 Barometer 30,02. 
3 7 (oye) 74,1 74,1 | 045p.m.| — 890 | Wilcox and Prinsep. 
4 212,3 212,9 Po OTIS) Bld roti ay +1401 
5 212,5 /ajileage, 212,5 120"3, +1401 
6 212, 212,6 212,4 1 45,, +1395 
7 | 211,5 | 212,7 | 2124 | 20 ,, | 1394 
Differenceof| rising, 139,2 dilatation, 2298 
temperature, { falling, 139,5 ditto. 2283 taking readings of 26th. 
Sixth Series, 26th November. Same Bar. 
1 71,3 71,5 71,9 \10 a. m.| — 916 | 
2 72,9 #5 73,9 |1125a.m.| — 875 | Barometer 30,02. 
3 yA) 74,1 74,2 | 030P.m.| — 865 |Wilcox and Prinsep. 
4!/ 2130 | 2123 | 2123 |10,, | +1418 
5 212,3 212,3 212,0 | 20 ,, +1405 
6] 2129 | 212,4 | 212,2 | 215,, | --1400 
7 | 2125 | 212.2 | 212,1 | 240,, | +1388 
Diff.of | rising, 139,1 dilatation, 2288 
temp., f falling, 139,7 ditto. 2288 |following morning. 
Seventh Series, 27th November. Same Bar. 
1 70,5 71,0 | 70,9 |100 Ae — 910 Bi 
2 72,3 73,2 73,0 noon. — 875 Barometer 29,92, 
3 73,0 73,6 | 73,5 |0 30P.m.| — 869 |Wilcox and Prinsep, 
4| 2122 | 2125 | 212,12 110 ,, | +1422 
Heelde Fy (io 2124.) 212,0 }1.30- os +1408 
6 2122 212,5 ZZ 0% | E45 35 + 1404 
7 212,7 212,5 242.0 12-0" OF +1398 
Difference of ope " : : 
temperature, 139,7 dilatation, 2293 | 
The accordance of the observations, particularly of the latter series, 
was so satisfactory as to render their further repetition superfluous : 
it now only remains therefore to arrange the data of the several 
experiments in a tabular form, and to calculate the resulting dilatations 
according to the usual expression of ‘‘ the dimensions taken by a bar at 
212°, whose length, at 32°, is 1,000000.” 
