710

.853 .833 .814 .795 .777 720 .865 .844 .824 .805 .787 730 .876 .855 .835 .816 .798 .780 .763 .748 .732 740 .888 .867 .846 .826 .808 .791 .774 .758 .742 750 .900 .878 .857 .837 .818 .801 .784 .768 .752 760 .911 .889 .868 .848 .829 .811 .794 777 770 .923 .901 .879 .859 .840 .822 .804 .787 780 .935 .913 .891 .870 .851 .832 .814 .797 .781 790 .947 .924 .902 .881 .843 .825 .807 .791 800 .959 .936 .914 .893 .853 .835 .817 .801 810 .970 .947 .925 .904 .883 .864 .845 820 .982 .958 .935 .914 .894 .874 .855 830 .994 .970 .947 .925 .904 .884 .865 840 1.005 .981 .958 .936 915 .895 .876 850 1.017 .992 .969 .947 .925 .905 860 1.028 1.003 .979 .957 .936 .915 870 1.040 1.015 .991 .968 880 1.051 1.026 1.002 .979 .957 890 1.063 1.037 1.013 .990 .968 900 1.075 1.049 1,024 1.001 .979 .957

.760

.743 .728 .713

.770

.753 .738 .722

.761

.771

.862
.873

.827.810 .794

.029

.837 .820
.847 .830
.857 .839 .822 .030

.804

.029

.813

.029

TABLE V.-COMPARISON OF THE CENTIGRADE THERMOMETER WITH FAHRENHEIT'S AND REAUMUR'S, GIVING THE CORRESPONDING VALUES FOR EACH DEGREE, FROM +50° TO —41° CENTIGRADE.

Cent. Fahr. Reau. Cent Fahr. Reau. Cent. Fahr. Reau. Cent. Fahr. Reau.

Comparison of the Scales for each Tenth of a Degree.

Cent.
Fahr.

0.1

Reau.

0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 0.18 0.36 0.54 0.72 0.9 1.08 1.26 1.44 1.62 1.8 0.08 0.16 0.24 0.32 0.4 0.48

0.56- 0.64 0.72 0.8

TABLE VI.-SHOWING THE ELASTIC FORCE OF AQUEOUS Vapour, IN INCHES OF MERCURY, FROM 0° тo 80°, calculated from the Experiments of Regnault.

From Mr Glaisher's Hygrometric Tables.

The intermediate tenths of degrees may be easily interpolated.

Force

Force

Force

Force

Force

Temp. of Temp. of Temp. of Temp. of Temp. of

vapour.

vapour.

vapour.

vapour.

vapour.

.068 34.5 .199

11 .071 35.0 .204

14

42.3
42.5 .272
.074 35.3 .206 42.7 .274
.078 35.5 .208 43.0
.277
.082 35.7 .209 43.3 .280 50.7

.270

49.7

50.0 .361 62.0 .556

50.3 .365

63.0 .576

50.5

.086 36.0 .212

16 .090 36.3 .214

.283 51.0 51.3 17 .094 36.5 .216 44.0 .288 51.5 .381 18 .098 36.7 .218 44.3 .292 51.7 .384 19 .103 37.0 .220 44.5 .294 52.0 .388

20 .108 37.3 .223 .113 37.5 .225 .118 37.7 .226

44.7 .296 52.3 .393 45.0 .299 45.3 .303 .123 38.0 .229 45.5 .305 24 .129 38.3 .231 45.7 .307

25 .135 38.5 .233 26 .141 38.7 .235 27 .147 39.0 .238

28 .153 39.3 .240

.160

46.0 .311 53.5 .410 46.3 .315 53.7 .413 77.0 .927 46.5 .317 54.0 .418 78.0 .958 46.7 .319 54.3 .422 79.0 .990 39.5 .242 47.0 .323 54.5 .425 80.0 1.023

76.0 .897

TABLE VII.-FACTORS FOR MULTIPLYING THE EXCESS OF THE DRY-BULB THERMOMETER OVER THAT OF THE WET-BULB, TO FIND THE EXCESS OF THE TEMPERATURE OF THE AIR ABOVE THAT OF THE DEW-POINT.

From Mr Glaisher's Hygrometric Tables.

TABLE VIII.-FOR COMPARING THE PRESSURE AND THE VELOCity of the WIND. Calculated from the Formulæ, V2 × .005 = P; and √200 × P = V.

From Instructions for taking Meteorological Observations, by Colonel Sir Henry James, R.E., F.R.S., &c.