TABLE VI.

(periment, as completely to fill the jar when the thermometer and the iron were immersed. Weight of the standard piece, 6000 grains,-temperature at immersion, 212.0 Weight of glass container and of thermometer bulb 3250 grains.

TABLE VII.

and the lighter 2465 grains, receiving equal quantities of water, so as accurately to fill them when the standard piece and the thermometer were immersed. Weight of the standard-piece 6000 grains; its temperature at immersion, 212o.

REMARKS.

g

grs. grs.

Thicker glass jar.

The first three of these experiments were made under the tin cone, the next three

7356 740.16 11764.8 860040 96001.584 .111624 within the tin cylinder with -433-6923

the cover affixed. The cone could not altogether prevent the circulation of air around the containing vessel.

7356 740.16 11764.8 859560 96941.952.112780 pared with the identical re

7356

The mean result of 2d and 3d experiments may be com sults of the 8th and 9th, and the formula for that comparison is

740.16 11764.8 859680 96706.656.112244 (T't-Tt).(w +e)

740.16 11692.9 861780 97811.004.113498

- the spe

Tig-Tig cific heat of glass of this description.

The mean result of the 4th and 6th experiments may in like manner be compared

740.16 11692.9 862380 96466.425.111860 with the identical results of

740.16 11692.9 861780 97811.004.113498

7356

7356

7356

g

2898 290.59 11315.3 858720 94822.214.110422 2465+=433

the 11th and 12th.

Thinner glass jar. The 7th, 8th and 9th experiments were made under the tin cone, and the 10th, 11th and 12th within the tin cylinder, the error of one-tenth of a degree is suspected to have occurred in the reading of the 7th experiment.

The equivalent for the containing vessel in this and the .112098 following experiment as derived from a comparison with the 2d and 3d experiments of this series, is 1254, 85,and this gives sp. ht. of iron.111743.

2898 290.59 11315.3 858000 96180.05

.112098

2898 290.59 11315.3 860640 96242.648 .111816

The equivalent for the con

290.59 11243.3 859920 97591.844.113489 tainer for this and the follow

TABLE VIII.

Experiments to determine the specific heat of the Iron Standard-piece used in experiments with the Steam Pyrometer employed in this investigation, the heating being performed in a bath of mercury surrounded with boiling water, the cooling in two

TABLE VIII.

different copper vessels capable of receiving equal weights of water, but having dif ferent thicknesses. Weight of the Standard-piece at the time, 6000 grains, and its temperature at immersion 212°.

38659 38659

196 19738 2056.8 40911.8 .114411 This and the last six are considered comparable.

19619738 2056.8 40911.8.118052|

38659 196 19738 2056.8 40911.8 38659 196 19738 2056.8 40911.8

This and the three following give results varying from the .118676 rest, partly on account of an excess of heat which kept the .117933 steam in the heating apparatus a little too high.

38659 196 19738 2056.8 40911.8 .117407 38659 196 19738 2056.8 40911.8 .111405 38659 196 19738 2056.8 40911.8 .111318

38659 196 19738 2056.8 40911.8 .114565 38669 196 19738 2056.8 40911.8 .117661 38659 196 19738 2056.8 40911.8 .110609 38659

196 19738 2056.8 40911.8.110869

Mean of all from 8 to 18.114990

Mean of 7 comparable=.113261

This experiment with No. 6, gives by calculation the specific heat of copper .10431.