OF STEAM AT DIFFERENT TEMPEEATUEES. 
191 
In the Tables of the experiments the temperatures are given as registered. In the 
summaries they are given reduced for pressure in the proportions above stated. No 
correction has been made to reduce the temperatures from the mercurial to the air- 
thermometer. 
Capacity of Globes. 
First, Globe A. — Water introduced =18009 grains at 63 °Fahr. This corrected 
to 39°T = 1803 3 grains. Hence the capacity at the several file marks, — 
Graduation ; First file mark . 
Second file mark 
Third file mark . 
Fourth file mark 
Fifth file mark . 
= 18033 grains. 
= 18169-2 grains. 
= 18285-4 grains. 
= 18411-6 grains. 
= 18637-8 grains. 
Second. Globe B. — Water introduced 
39°-l = 17663 grains. 
Graduation : First file mark . 
Second file mark . 
Third file mark 
Fourth file mark . 
Fifth file mark . 
= 17642 grains at 62°-5. Corrected to 
= 17663 grains. 
= 18420-4 grains. 
= 18672-9 grains. 
= 18925-3 grains. 
= 19177-7 grains. 
Third. Globe C. — Capacity taken with mercury equivalent to 18025 grains of water 
at 62°Fahe. Corrected to 39°-l = 18046 grains. 
Graduation : First file mark . 
Second file mark 
Thu-d file mark . 
Fourth file mark 
Fifth file mark . 
Sixth file mark . 
Seventh file mark 
= 18046 grains. 
= 18298-4 grains. 
= 18550-8 grains. 
= 18803-2 grains. 
= 18929-4 grains. 
= 19055-6 grains. 
= 19181-8 grains. 
The following Tables give the results of the- experiments between the ordinary atmo- 
spheric pressure and 60 lbs. per square inch. The first Table gives the observed results 
in full in each case, and the second gives a summary in which the column levels at the 
same temperature are averaged and corrections made for pressure in the thermometer 
bulb, expansion of mercury, &c. 
Time . — The time between each reading is given as an indication of the reliability of 
the determinations of the column levels ; changes of temperature could be made with 
great rapidity in the steam-bath, even without blowing off any steam, by lowering the 
gas-lights; but it required ten to fifteen minutes before the temperature of the glass 
globe had become uniform with the surrounding steam, and the columns had become 
stationary under the new temperature. When this was found to have taken place, a 
