An account of the trigonometrical operation, wherby the distance between the meridians of the observatories of Greenwich and Paris has been determined / By William Roy.
- William Roy
- Date:
- [1790]
Licence: Public Domain Mark
Credit: An account of the trigonometrical operation, wherby the distance between the meridians of the observatories of Greenwich and Paris has been determined / By William Roy. Source: Wellcome Collection.
31/200 page 27
![[To face page 26.} General Table of the Meafurement of to be 9512 Days. 17 20 23 24 26 29 the Base of Verification in Romney Marsh, executed in the Autumn of 1787, whereby the apparent Length is found Yards and the true, or correfted Length in the Temperature of 62% 28532 Feet- 'T O O O o ^ * Spaces Imeafured. Yards. Temperature. Mean by ] diff. i5Therm. from 6i°. + 59 1 62.1 68.1 57 9 60.8 - 2.9 In. Parts 0.1671° + 0.01602 0.01602 o. 11445 0.22432 0.19228 0-34793 0.07096 0.18541 O.I5336 0.14421 0.27468 °-15565 0.06638 0.04578 0.06638 + 0 02518 + 0 i3963 0.09385 0.02747 -2.16540I oa. Days. Yards. Mean by I diff. i5Therm. from 6a0. 55-6 In. Parts + 0.06867 + 0.04807 0.12132 0.07554 0.05722 0.10758 0.16939 0.18541 0.29757 0.18312 0.25408 0.29528! 0.26552 0.30901 0.44407 0-22203 0.20601 0.21974' 0.33648 0.14650 Noy. Days. 10 12 13 16 17 Yards. 4100 4200 43°° 4400 4500 4600 4700 4800 4900 5000 5100 5200 53°° 5400 55°° 5600 5700 5800 5900 6coo — 3-779x3 Temperature. Corredtion for the difference. j Spaces Temperature. Corredtion for the difference. Days. Spaces meafuredr Yards. Temperature. Correction for the difference. Mean by 15 Therm. diff. from 62°. jurays* Y ards. Mean by i5Therm. diff. from 62°. Mean by 15 Therm. | diff. from 62°. In. Parts. In. Parts. In. Parts. 55.2 - 6.8 0.15565 6lOO 42.1 -19.9 0-45551 8lOO , 36-3 -25.7 0.58827 55-3 - 6.7 0.15336 Mov. 6200 39-3 — 22.7 0.5x960 8200 39-2 — 22.8 0.52189 53-6 - 8,4 0.19228 21 63OO 43-3 -18.7 0.42804 Nov. 83OO 39-5 -22.5 0.51502 49.0 - 13.0 0.29757 64OO 46.5 —15.5 0-35479 29 8400 34'8 — 27.2 0.62261 50.1 —11. q 0.27239 6500 45-6 —16.4 0-3754° 8500 40-5 -21.5 o.492I3 47-9 - 14-1 0.32275 22 660O 42.5 -i9-5 0.44635 0600 42-3 -19.7 0-45093 44-7 — 17-3 0.39600 6700 42.2 —19.8 045322 3° O7OO 30.5 -3I-5 0.72103 44.8 — 17.2 o.3937i 6800 41-2 — 20.8 0.47611 8800 44-3 — *7-7 0.40515 41,3 -20.7 0.47382 23 69OO 39-8 — 22.2 0.50816 T)ec. 890O 46.0 —16.0 0.36624 41.8 — 20.2 0.46238 7000 39 0 -23° 0.52647 I 9000 43.0 —19.0 0.43491 42.9 —19.1 0.43720 7100 37-7 -24.3 0.55623 9IOO 45.6 —16.4 0-37540 45-3 —16.7 0.38226 24 7200 36.2 -25.8 0.59056 9200 48.7 -J3 3 0.30444 44.x - 17.9 0.40973 7300 42.1 -19.9 0-45551 3 930° 41.1 — 20.9 0.47840 40.4 — 21.6 0.49442 7400 40.5 -2I.5 0.49213 94OO 46.9 -15-1 0.34564 4i-5 -20.5 0.46924 26 1! 7500 35.2 -26.8 0.61345 4 9512.2454 48.4 -13.6 0.34942 44.8 — 17.2 0.39371 i 7600 39.8 — 22.2 0.50816 — 44.6 - 17.4 0.39829 7700 38-5 -23.5 ‘ 0.53791 — 6.97148 40.6 — 21.4 0.48985 27 7800 33'6 — 28.4 0.65098 — 10.14802 39-4 — 22.6 0.51731 17900 32-9 -13*1 0-52876 - 7-5S574 4I*3 20.7 0.47382 28 8coo 32,7 -29-3 0.67068 “ 3-77913 — 2.16540 r- XT' CO ir *>< 1 i- — 10.14802 Total Correftion -30.64977 Feet. In. r akove Table it appears, that the total apparent length of the Bafe, as given immediately by ffae Steel Chain, was 95i2TyasB% yards, which are equal to 28536 8.835 The correftions in the above Table, and others fpecified in the Text, being fubtraaed from the apparent length, — — — 3 9-799 There remains, for the true length of the bafe in the temperature of 62° of Fahrenheit, equal to —* 28532 11.036 28532 Feet. SECTION](https://iiif.wellcomecollection.org/image/b28763324_0031.jp2/full/800%2C/0/default.jpg)
