EXPANSION OF BRASS. 
787 
Table III. 
Logarithms of the ratio of the density of brass at 0 ° to its density at f, and 
their arithmetical complements, assuming the coefficient of linear expansion 
= 0-00001722. 
t . 
logBr. 
10— log Br. 
t . 
log Br. 
10— log Br. 
0 
0-0000000 
10-0000000 
16 
0-0003588 
9-9996412 
1 
0-0000224 
9-9999776 
17 
0-0003812 
9-9996188 
2 
0-0000449 
9-9999551 
18 
0-0004037 
9-9995963 
3 
0-0000673 
9-9999327 
19 
0-0004261 
9-9995739 
4 
0-0000897 
9-9999103 
20 
0-0004485 
9-9995515 
o-i 
22 
5 
0-0001122 
9-9998878 
21 
0-0004709 
9-9995291 
0-2 
45 
6 
0-0001346 
9-9998654 
22 
0-0004933 
9-9995067 
0-3 
67 
7 
0-0001570 
9-9998430 
23 
0-0005158 
9-9994842 
0-4. 
90 
8 
0-0001795 
9-9998205 
24 
0-0005382 
9-9994618 
0-5 
1 1 2 
9 
0-0002019 
9-9997981 
25 
0-0005606 
9-9994394 
0-6 
*35 
10 
0-0002243 
9-9997757 
26 
0-0005830 
9-9994170 
0-7 
*57 
11 
0-0002467 
9-9997533 
27 
0-0006054 
9-9993946 
0-8 
*79 
12 
0-0002691 
9-9997309 
28 
0-0006277 
9-9993723 
o“9 
202 
13 
0-0002916 
9-9997084 
29 
0-0006502 
9-9993498 
14 
0-0003140 
9-9996860 
30 
0-0006726 
9-9993274 
15 
0-0003364 
9-9996636 
Expansion of Bronze. 
Table IV. 
Logarithms of the ratio of the density of the alloy adopted by Mr. Baily for tlie 
standard bars at 0 ° to its density at f, the coefficient of its linear expansion at 
17 ° being 0 - 00001705 , according to the observations of Mr. Sheepshanks. 
t . 
log Ba. 
10 — log Ba. 
t . 
log Ba. 
10— log Ba. 
0 
0-0000000 
10-0000000 
16 
0-0003553 
9-9996447 
1 
0-0000222 
9-9999778 
17 
0-0003775 
9-9996225 
2 
0-0000444 
9-9999556 
18 
0'0003997 
9-9996003 
o-i 
22 
3 
0-0000666 
9-9999337 
19 
0-0004219 
9-9995781 
0-2 
44 
4 
0-0000888 
9-9999112 
20 
0-0004441 
9-9995559 
0-3 
67 
5 
0-0001111 
9-9998889 
21 
0-0004663 
9-9995337 
0-4 
89 
6 
0-0001333 
9-9998667 
22 
0-0004884 
9-9995116 
0-5 
1 1 1 
7 
0-0001555 
9-9998445 
23 
0-0005106 
9-9994894 
0-6 
*33 
8 
0-0001777 
9-9998223 
24 
0-0005328 
9-9994672 
0-7 
*55 
9 
0-0002009 
9-9997991 
25 
0-0005550 
9-9994450 
0-8 
*78 
10 
0-0002221 
9-9997779 
26 
0-0005772 
9-9994228 
0-9 
200 
11 
0-0002443 
9-9997557 
27 
0 0005994 
9-9994006 
12 
0-0002665 
9-9997335 
28 
0-0006216 
9-9993784 
13 
0-0002887 
9-9997113 
29 
0-0006437 
9-9993563 
14 
0-0003109 
9-9996891 
30 
0-0006659 
9-9993341 
15 
0-0003331 
9-9996669 
Expansion of Platinum. 
Schumacher has given two tables of the expansion of platinum, one calculated on 
the supposition that the coefficient of the linear expansion is 0 - 00000900 , the other 
with the coefficient 0 - 00000909 , as if in doubt which deserved the preference. Stein- 
HEiL adopts 0-0000085655 in the reduction of the weighings of the platinum kilo- 
gramme des Archives. In comparing the standard platinum m^tre with a glass 
mkre the expansion of which was known, at temperatures, however, not differing 
much from each other, he obtained 0-00000905 for the coefficient of expansion. 
5 L 
MDCCCLVI. 
