TABLE XVI.

CORRECTIONS FOR CURVATURE AND REFRACTION,

Shewing the difference of the Apparent and True Level in Feet, and Decimal parts of

Feet, for Distances in Feet, Chains, and Miles.

Correction in Feet.

Correction in Feet.

Correction in Feet.

malelovel

100 1.00024.00004 .00020 1.0 .00010 .00001 .00009

.0417 .0060 .0357 150 .00054 .00008 .00046 1.5.00024 .00003 .00021

.1668 .0238 .1430 200 1.00096 .00013 .00083 2.0 .00042 .00006 .00036

.3752 .0536 .3216 250 1.00149 .00021 .00128 | 2.5 .00065 .00009 .00056

.6670 .0953 .5717 300 .00215 .00031 .00184 3.0 .00094 .00013 .00081 11 1.5008 .2144 1.2864 350 .00293 .00042 .00251 3.5 .00128 .00018 .00110 2 2.6680

.3811

2.2869 400 1.00383 .00055 .00328 4.0 .00167 .00024 .00143 2 4.1688 .5955 3.5733 450 1.00484.00069 .00415 4.5 .00211 .00030 .00181 3 6.0030

.8561

5.1469 500 .00598.00085 .00513 5.0 .00261 1.00037 1.00224 3} 8.1708 1.1673 7.0035 550 1.00724 .00103 .00621 5.5 .00315 .00045 .00270 4 10.6720 1.5246 9.1474 600 1.00861.00123 .00738 6.0 .00375 .00054 .00321 41| 13.5468 1.9295 11.5773 650 1.01010 .00144 .00866 6.5 .00440 .00063 .00377 5 16.6750 2.3821 14.2929 700 1.01172.00167 .01005 7.0 .00511.00073.00438 520.1769 2.8824 17.2945 750 .01345 .00192 .01153 7.5 .00586 .00084 1.00502 6 24.0120 3.4303 20.5817 800 1.01531 .00219 .01312 8.0 .00667 .00095 .00572 6 28.1809 4 0258 24.1551 850 1.01728 .00247 .01481 8.5 .00753 .00108.00645 32.6830 4.6690 28.0143 900 1.01938 .00277 .01661 9.0 .00844 .00121 1.00723 7 37.5190 5.3599 32.1591 950 1.02159 .00308 .01851 9.5 .00940 .00134 1.00806 8 42.6880 6.0997 36.5883 1000 1.02392 .00333 .02059 10.0 .01042 .00149 .00893 81 48.1910 6.8844 41.3066 1050 1.02638 .00377 1.02261 |10.5 .01149 .00164 .00985 9 54.0270 7.7181 46.3089 1100 .02895 .00414 .02481 11.0 .01261 .00180 1.01081 93 60.1971 8.5996 51.5975 1150 1.03164 .00452 .02712 11.5 .01378 .00197.01181 10 66.7000 9.5286 57.1714 1200 1.03445 .00492 .02953 12.0.01501 .00214 .01287 11 80.7070 11.5296 69.1774 1250 1.03738 1.00534 .03204 12.5 .01628 .00233 .01395! 12 96.0480 13.7211 82.3269 1300 1.04043 .00578.03465 13.0 .01761 .00252.01509 13 112.7230 16.1033 96.6197 1350 1.04361 .00623 .03738 13.5 .01899 .00271 .01628 14 130.7320 18.6760 |112.0560 1400 .04689 1.00670 .04019 14.0 .02043 .00292 \.01751 15 150.0750 21.4393 128.6357 1450 1.05030 1.00719 1.04311 14.5 .02191 .00313.01878 16 170.7520 24.3931 146.3589 1500 .05383 .00769 .04614 15.0.02345 .00335.02010 17 192.7630 27.5376 165.2254 1550 .05748.00821 1.04927 15.5.02504 .00358 1.02146 18 216.1086 30.8727 185.2359 1600 1.06125 .00875 .05250 16.0 .02668 .00381 1.02287 19 240.7870 34.3981 206.3889 1650 1.06514.00931 .05583 16.5 .02837 .00405.02432 20 266.8000 38.1143 228.6857 1700 .06914 .00938 .05926 17.0 .03012 .00430 1.02582 1750 1.07327 1.01047.06280 17.5.03192 .00456 1.02736 1800 1.07752 .01107.06645 18.0 1.03377.00482 02895 1850 .08188 .01170.07018 18.5 .03567 .00509.03058 1900 1.08637 .01234.07403 19.0 1.03762 1.00537 1.03225 1950 1.09098 .01300 1.07798 (19.5.03963 1.00566 1.03397 2000 .09570.01367.08203 20.0.04169.00596.03573

TABLE XIX. COMPARATIVE SCALE OF FARENHEIT'S, REAUMUR'S, AND THE CENTESIMAL THERMOMETERS. Far. Reau. Cent. Far. Reau. Cent. Far. Reau. Cent. Far. Reau. Cent.

The following nula will serve for the comparison of these Thermometers.

F = $ C + 32 = &R + 32
C= (F - 32)= R
$ (F 32)= $C

Freezing point. Boiling point.
Farenheit

32°

212 Reaumur

80 Centigrade

0

100 The Logarithms answering to every degree of the graduations of the above Thermometers will be found at p. 296, vol. i. of Dr. Pearson’s “ Practical Astronomy.”

31.0

29

1.05