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710

790

800

.947 .924
.959 .936

.853 .833 .814 .795 .777 .760 .743 720 865 .844 .824 .805 .787 .770 .753 730 .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 .736 760 .911 .889 .868 .848 .829 .811 .794 .777 .761 .746 770 .923 .901 .879 .859 .840 .822 .804 .787 .771 .755 .027 780 .935 .913 .891 .870 .851 .832 .814 .797 .781 .765 .902 .881 .862 .843 .825 .807 .791 775 .914 .893 .873 .853 .835 .817 .801 .785

.728 .713

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.738 .722 .707

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.717

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.726

.026

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.027

.028

.028 .028

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980

990

1000

910 1.086 1.060 1.035 1.012 .989
920 1.098 1.071 1.046 1.022 .999
930 1.109 1.082 1.056 1.033 1,010 .988 .966 .945 .925
940 1.120 1.093 1.067 1.043 1.020 .998 .976 .955 .935
950 1.132 1.105 1.079 1.054 1.03) 1.008
.986 .965 .945
960 1.144 1.116 1.090 1.065 1.041 1.018 .996 .975 .954 .935
970 1.155 1.128 1.101 1.076 1.052 1.029 1.006 .985 .964
1.167 1.139 1.112 1.087 1.063 1.040 1.017 .995 .974
1.178 1.150 1.123 1.098 1.073 1.050 1.027 1.005 .983
1.190 1.161 1.134 1.108 1.084 1.060 1.037 1.015

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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.

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Comparison of the Scales for each Tenth of a Degree.

Cent.

Fahr.

Reau.

0.1 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

Fahr.

0.1 0.2 0.3 0.4

0.5

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0.1 0.2 0.3 04
0.22 0.45 0.67 0.9
0.12 0.25 0.37 0.5

0.6 0.7 0.8 0.9 1.0 0.06 0.11 0.17 0.22 0.28 0.33 0.39 0.44 0.5 0.56 0.04 0.09 0.13 0.18 0.22 0.27 0.31 0.36 0.4 0.5 0.6 0.9 0.7 0.8 1.0 1.12 1.35 1.57 1.80 2.02 2.25 0.62 0.75 0.87

0.44

1.00

1.12

1.25

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.

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52.7 .399

73.0 .812

23

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25 .135

26 .141

38.5 .233 46.0 .311 38.7 .235 46.3 .315 53.7 .413 27 .147 39.0 .238 46.5 .317 54.0 .418 78.0 28 .153 39.3 .240 29 .160 39.5 .242

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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.

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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.

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