{ "id": "3e6a8cc86d1f2734b71e893304bccbc62dd905c6", "text": "It lived with me about a Fortnight, but I could never perceive that it beat, after it was confin'd in the Box.\n\nII. Observations of the Eclipses of the first Satellite of Jupiter, communicated by his Excellency William Burnet, Esq; Governor of New York, F. R. S.\n\nThese Observations were made in the Fort of New York, for determining the Longitude of that Place by us,\n\nWilliam Burnet, Cadwallader Colden, James Alexander, and calculated by Cadwallader Colden.\n\nThe Latitude of the Fort, was formerly determin'd to be $40^\\circ 40'$.\n\nAugust the 9th, 1723.\n\nTime of Emerion at London, according to Mr. Pound's Tables, reduced to apparent Time\n\n| H. | M. | S. |\n|----|----|----|\n| 16 | 09 | 25 |\n\nTime as it was seen at New York\n\n| H. | M. | S. |\n|----|----|----|\n| 11 | 10 | 43 |\n\nDifference of Meridians\n\n| H. | M. | S. |\n|----|----|----|\n| 4 | 58 | 42 |\n\nI neglected to write down the Altitudes which were taken of the Sun, for correcting the Clock.\n\nAugust\nAugust the 25th.\n\n| Altitude of the Sun's Upper Limb | Time by the Clock | Time by Calculation |\n|---------------------------------|-------------------|--------------------|\n| 0° 1' | H. 1° | H. 1° |\n| Sun's Declin. | 549 30 00 | 10 17 52 | 10 17 28 |\n| 6° 55' | 51 13 30 | 10 33 10 | 10 32 8 |\n| Aug. 26. | 46 24 00 | 9 57 40 | 9 56 25 |\n| Sun's Declin. | 47 50 00 | 10 8 22 | 10 6 57 |\n| 6° 33' | | | |\n\nH. 1°\n\nTime of Emersion by Mr. Pound's Tables 14 31 25\nEquation of Time to be added 00 01 22\n\n14 32 47\n\nTime observ'd by the Clock 09 35 14\nThe same corrected 09 34 14\n\nThe Difference of Meridians 04 58 33\n\nThis I look upon as the most distinct and best Observation.\n\nSeptember the 10th.\n\n| Altitude of the Sun's Upper Limb | Time by the Clock | Time by Calculation |\n|---------------------------------|-------------------|--------------------|\n| 0° 1' | H. 1° | H. 1° |\n| Sun's Declin. | 33 21 | 09 01 00 | 09 00 16 |\n| 49' | 34 06 | 09 06 01 | 09 04 49 |\n| Sept. 17th | 17 17 | 04 21 40 | 04 21 44 |\n| Sun's Declin. | 15 15 | 04 33 05 | 04 32 47 |\n| 1° 54' | | | |\n\nTime\nTime of Emersion by the Clock September 10th\n\n| Time by the Clock | H. ' \" |\n|-------------------|-------|\n| 08 00 10 |\n\nTime of Emersion by Mr. Pound's Tables\n\n| Time by the Clock | H. ' \" |\n|-------------------|-------|\n| 12 50 36 |\n\nEquation of Time to be added\n\n| Equation of Time | H. ' \" |\n|------------------|-------|\n| 00 06 54 |\n\nCorrected Time at New York\n\n| Corrected Time | H. ' \" |\n|------------------|-------|\n| 12 57 30 |\n| 07 59 08 |\n\nDifference of Meridians\n\n| Difference | H. ' \" |\n|------------------|-------|\n| 04 58 22 |\n\nJune 26th, 1724,\n\nAltitude of the Sun's Upper Limb.\n\n| Altitude | Time by the Clock | Time by Calculat. |\n|-----------------|-------------------|-------------------|\n| 0° | 09 48 03 | 09 43 37 |\n| Sun's Declin. | | |\n| 23° 7 | 10 09 40 | 10 05 05 |\n| June 27th, | | |\n| Sun's Declin. | | |\n| 22° 26 | 10 27 43 | 10 27 05 |\n| | 10 40 00 | 10 39 27 |\n\nJune the 26th, Time of Immersion by the Clock\n\n| Time by the Clock | H. ' \" |\n|-------------------|-------|\n| 11 41 12 |\n\nTime of Immersion by Mr. Pound's Tables\n\n| Time by the Clock | H. ' \" |\n|-------------------|-------|\n| 16 43 02 |\n\nEquation of Time to be subtracted\n\n| Equation of Time | H. ' \" |\n|------------------|-------|\n| 00 04 26 |\n\nTime at New York corrected\n\n| Corrected Time | H. ' \" |\n|------------------|-------|\n| 16 38 36 |\n| 11 40 15 |\n\nDifference of Meridians\n\n| Difference | H. ' \" |\n|------------------|-------|\n| 04 58 21 |\n\nThe Mean of all these Observations is $4^h\\ 58'\\ 30''$ which agrees to $3''$ with that Observation, which I thought the most exact, and therefore the Longitude of New York, is nearly $74^\\circ\\ 57'\\ 30''$ West from London.\nThe Variation of the Magnetick Needle was observ'd, this Year, to be $7^\\circ 20'$ West. Philip Wells, Surveyor General of this Province, in the Year 1686, observ'd it to be $8^\\circ 45'$; by which, it appears to decrease about $1^\\circ 25'$ in 38 Years, or a little more than two Minutes in a Year.\n\nIII. A New Contrivance for taking Levels, by the Reverend John Theophilus Desaguliers, L. L. D. R. S. S.\n\nThat the Air Thermometer is also a Barometer, has been observ'd long ago; and, because the Liquor in it will rise and fall, as well by the Change of the Weight of the Air, as by the Air's Rarefaction by Heat and Cold, this Instrument has no longer been made use of as a Thermometer, and, in its stead, Spirit of Wine Thermometers, hermetically seal'd, have been us'd ever since.\n\nBut, because the Errors of the Air Thermometer (or its Difference from the Spirit Thermometer) depend only upon the Change of the Weight of the Atmosphere from what it was, when the two Thermometers were set at the same Degree of their respective Scales; the late Dr. Hook contriv'd an Instrument, that he call'd a Marine Barometer, made of a Combination of the two abovemention'd Thermometers; in such Manner, that a third Scale being made use of, to observe the Difference of the two Thermometers, thereby the Change of the Air's Gravity, and consequently Storms, Rains, and fair Weather, might be foretold at Sea, where the Quicksilver Barometer becomes useless by the flanking of the Ship.", "source": "olmocr", "added": "2026-01-12", "created": "2026-01-12", "metadata": { "Source-File": "/home/jic823/projects/def-jic823/royalsociety/pdfs/103766.pdf", "olmocr-version": "0.3.4", "pdf-total-pages": 5, "total-input-tokens": 7288, "total-output-tokens": 2072, "total-fallback-pages": 0 }, "attributes": { "pdf_page_numbers": [ [ 0, 0, 1 ], [ 0, 961, 2 ], [ 961, 2709, 3 ], [ 2709, 4735, 4 ], [ 4735, 6215, 5 ] ], "primary_language": [ "en", "en", "en", "en", "en" ], "is_rotation_valid": [ true, true, true, true, true ], "rotation_correction": [ 0, 0, 0, 0, 0 ], "is_table": [ false, false, true, false, false ], "is_diagram": [ false, false, false, false, false ] }, "jstor_metadata": { "identifier": "jstor-103766", "title": "Observations of the Eclipses of the First Satellite of Jupiter, communicated by His Excellency William Burnet, Esq; Governor of New York, F. R. S.", "authors": "William Burnet", "year": 1724, "volume": "33", "journal": "Philosophical Transactions (1683-1775)", "page_count": 5, "jstor_url": "https://www.jstor.org/stable/103766" } }