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.

100.00024 .00004.00020 150 .00054.00008.00046

200 .00096.00013.00083 250 .00149.00021.00128 300 .00215.00031.00184 350 .00293.00042.00251

400.00383.00055 .00328

1.0.00010.00001 .00009
1.5.00024.00003.00021
2.0.00042 .00006 .00036
2.5 .00065.00009 .00056 1
3.0.00094 .00013 .00081
3.5 .00128 .00018 .00110 2
4.0 .00167.00024 .00143
4.5 .00211.00030.00181
5.0.00261 .00037 .00224
5.5 .00315.00045.00270

2

3

3

6.0030 .8561 8.1708 1.1673 10.6720 1.5246 9.1474 1.9295 2.3821 14.2929

5.1469 7.0035

11.5773

2.8824 17.2945

24.0120

6.0.00375.00054 .00321 4 13.5468
6.5 .00440.00063 .00377
16.6750
7.0.00511.00073 .00438 5 20.1769
7.5 .00586.00084 .00502
8.0.00667.00095 .00572

450 .00484.00069.00415 500.00598.00085.00513 550.00724.00103.00621 600 .00861.00123.00738 650 .01010.00144.00866 700.01172.00167.01005 750.01345.00192 .01153 800.01531.00219 .01312 850.01728.00247.01481 8.5 .00753.00108.00645 900.01938.00277.01661 9.0.00844 .00121.00723 950.02159.00308 .01851 9.5 .00940.00134 .00806 1000 .02392.00333 .02059 10.0 .01042 .00149.00893 1050 .02638 .00377.02261 10.5 .01149 .00164.00985 1100.02895.00414.02481 11.0.01261.00180.01081 1150.03164.00452 .02712 11.5 .01378 .00197.01181 1200 .03445.00492 .02953 12.0.01501 .00214.01287 1250.03738 .00534.03204 12.5 .01628 .00233 .01395 12 96.0480 1300.04043 .00578.03465 13.0.01761 .00252 .01509 13 112.7230 16.1033 96.6197 1350 .04361.00623.03738 13.5 .01899 .00271 .01628 14 130.7320 1400 .04689 .00670.04019 14.0.02043 .00292 .01751 1450 .05030.00719.04311 14.5 .02191.00313.01878 1500 .05383.00769.04614 15.0.02345 .00335.02010 1550 .05748.00821.04927 15.5 .02504 .00358 .02146 1600.06125.00875.05250 16.0.02668 .00381.02287 1650.06514.00931.05583 16.5 .02837 .00405 .02432 1700 .06914 .00988 .05926 17.0 .03012 .00430 .02582 1750 .07327 .01047.06280 17.5 .03192 .00456 .02736 1800 .07752 .01107.06645 18.0.03377.00482.02895 1850.08188.01170.07018 18.5.03567.00509.03058 1900 .08637 .01234 .07403 19.0.03762 .00537.03225 1950.09098 .01300 .07798 19.5.03963 .00566.03397 2000 .09570 .01367.08203 20.0.04169 .00596 .03573

13.7211 82.3269

18.6760 112.0560
21.4393 128.6357

15 150.0750
16 170.7520
17 192.7630 27.5376 165.2254
18 216.1086 30.8727 185.2359
19 240.7870 34.3981 206.3889
20 266.8000 38.1143 228.6857

24.3931146.3589

For Curvature

and Refraction.

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 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 p. 296, vol. i. of Dr. Pearson's "Practical Astronomy."