TABLE XVI.

CORRECTIONS FOR CURVATURE AND REFRACTION.

Showing 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.

For Refraction.

For Curvature

and Refraction.

Correction in Feet.

100 00024 00004 00020

150000540000800046

200 00096 0001300083 25000149 00021 00128 300 00215 00031 00184 35000293 00042 00251 40000383 00055 00328 450 00484 00069 00415 500 00598 00085 00513 55000724 0010300621 60000861 0012300738 65001010 00144 00866 700 01172 00167 01005 750 01345 00192 01153 800 01531 00219 01312 850 0172800247 01481 9000193800277 01661

1.00001000001 00009
1.5 00024 00003 00021
2.0 00042 00006 00036
2.500065 0000900056
30 00094 00013 00081 14
3.5 001280001800110 2
40 00167 00024 00143 24
4.5002110003000181
50 00261 00037 00224 3
5.5 00315 00045 00270
6000375 00054 00321 4
6.5 00440 00063 00377 5
70 005110007300438 5
7.5 00586 00084 00502
8.0006670009500572
8.500753·0010800645

9000844 0012100723

6

7 32.6830 4.6690 28.0143

737-5190

5.3599 32.1591

48-1910

6.0997 36-5883 6.8844 41.3066

54-0270

7.7181 46.3089

950 02159 0030801851 9.50094000134 00806 8 42.6880 100002392 00333 02059 10-0 01042 00149 00893 8 105002638 00377 02261 10.501149 00164 00985 1100 0289500414 02481 11.001261 00180 01081 115003164 00452 02712 11.5 01378 00197 01181 10 120003445 00492 02953 12.001501 00214 01287 11 1250037380053403204 12.5 01628 00233 01395 12 130004043 00578 03465 13.0 0176100252 01509 13 135004361 0062303738 13.5 01899 00271 01628 14 14000468900670 04019 14.002043 00292 01751 15 1450050300071904311 14.5 0219100313 01878 16 15000538300769 04614 15.00234500335 02010 17 1550 05748 00821 04927 15.5 0250400358 02146 18 1600 0612500875 05250 16.0 02668 0038102287 19 1650 0651400931 05583 16.5 0283700405 02432 20 1700069140098805926 17.0 0301200430 02582 1750 073270104706280 17.503192 0045602736 1800 077520110706645 18.0 03377 00482 02895 1850 08188 01170 07018 18-5035670050903058 190008637 01234 07403 19003762 0053703225 1950 090980130007798 19.50396300566 03397 2000-09570 0136708203 20-0 041690059603573

130-7320 18.6760 112.0560 150-0750 21-4393 128.6357 170-7520 24.3931 146-3589 192-7630 127.5376 165.2254 216-1086 30-8727 185.2359 240-7870 34-3981 206.3889 266-8000 38.1143 228.6857

and Refraction.

TABLE XVII.

REDUCTION IN LINKS AND DECIMALS UPON EACH CHAIN'S LENGTH FOR THE FOLLOWING VERTICAL ANGLES.

TABLE XIX.

COMPARATIVE SCALE OF FAHRENHEIT'S, REAUMUR'S, AND THE CENTESIMAL THERMOMETERS.

Fah. Reau.

Cent. Fah. Reau. Cent. Fah. Reau. Cent. Fah. Reau.

Cent. +

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

The Logarithms answering to every degree of the graduations of the above Thermometers will be found at page 296, vol. i., of Dr. Pearson's "Practical Astronomy."