Bayly, William, 1737 - 1810 (astronomer)
Found in 23 Collections and/or Records:
Papers regarding payments for work done on behalf of the Board.
Observations from Captain Cook's last voyage.
Table of rough calculations of observations; these include records of the time by the watch, the apparent time, and the altitude of the sun and moon. Many entries are checked and marked 'done' or 'correct'.
Computations relating to the Sun, including those on the Sun's place using Johann Mayer's tables, 11 May 1765 - 29 April 1766, with reference to the obliquity of the ecliptic. There are calculations of the mean time of the transit of the Moon between 31 May 1765 and 28 April 1766, and on the Moon's longitude and latitude using Mayer's tables, 31 May - 19 November 1765. The calculations were made by William Bayly.
Daily record of the time by the watch or timekeeper [Kendall’s K1] between 10 December 1779 and 8 September 1780, signed by William Bayly, John Gore and James Burney (or occasionally John Rickman). It includes a note by Bayly on first receiving the watch in June 1776 [RGO 14/61/4: 1r], occasional remarks concerning when it was carried on shore or stoppages, and a brief note on 4 September 1780 of ‘a fire in the cabin’ [RGO 14/61/4: 4v].
Regarding the observations made by William Bayly during the voyage of HMS Discovery.
Concerning the rate of the Board of Longitude's watch and the provision of books and instruments.
Concerning a fault in the sextant and requesting a replacement instrument; also concerning his desire to be placed in the land detachment.
Concerning a replacement sextant and black index glass from Ramsden.
Sent from HMS Sirius, concerning a timekeeper [K1] received from William Bayly.
The log book of HMS Adventure compiled by W. Bayly during his passage to the South Seas as part of the expedition led by Captain James Cook in HMS Resolution.
This section is inverted in the volume and consists of two series: a daily log of time by the watch [K1], and further observations covering December 1779 to September 1780.
Daily log of observations from December 1779 to September 1780, showing barometer and thermometer readings (in the morning, at noon, and in the evening), the latitude and longitude, magnetic variation and dip [of the needle], the wind direction and remarks on the weather. The entries also include occasional mention of the location of the two ships on their return journey (travelling via Macau, Pulo Condore [Côn Đảo], Krakatau, and the Cape of Good Hope).
Observations of the going rate of the two watches, first from Nevil Maskelyne before the voyage, and then daily during the voyage with signatures from each of the three keyholders, William Bayly, Captain Tobias Furneaux, and First Lieutenants Joseph Shank or later, Arthur Kempe (sometimes signed instead by James Burney, Peter Fannin, Thomas Woodhouse, Robert Browne, Mr Lanyon, or William Hawksey).
Observations made on board HMS Adventure during her passage to the South Seas as part of the expedition led by Captain James Cook in HMS Resolution.
'Account of the going of the two longitude watches on board His Majesty's sloop, the Adventure Captain Furneaux Commander bound towards the South Seas.' Only two pages of the account and the front cover survive. The rating of the watches covers the period 13-29 July 1772.
Reductions of the Moon's place in comparison with tables, 1763-1771, and calculations by Mr Hollins of the Moon's transit, 1772, by George Gilpin on the Moon's places, 1768-1776, by William Bayly on the Moon, 1766-1775, and by Reuben Burrows on the Moon, 1762-1770. There are also reductions of the Moon's place, 1781-1782, and references to reduced observations, 1783-1792.
Observations and comparisons during the trials of John Harrison's chronometers (H1, H2, H3 and H4) and Kendall I, with mean solar time, 1766-1767, and the rating of the Royal Observatory transit clock, 1771. The volume is comprised largely of tables of measurements, with some descriptions of how the results were achieved.
- Astronomy 4
- Geographical exploration 4
- London 4
- Longitude 4
- Marine navigation 4
- Cape of Good Hope 3
- Nautical instruments 3
- Navigational aids 3
- Portsmouth 3
- South Pacific Ocean 3
- Time measuring instruments 3
- Alaska 2
- Australia 2
- Côn Đảo 2
- Hawaii 2
- Kamchatka 2
- Krakatau 2
- Macau 2
- North Pacific Ocean 2
- Southern Ocean 2
- Sydney 2
- Africa 1
- Antarctica 1
- Atlantic Ocean 1
- Chu 1
- French Polynesia 1
- Horology 1
- Japan 1
- Madeira 1
- Mehetia 1
- Navigation (science) 1
- New Zealand 1
- São Tiago 1
- Table Bay 1
- Tahiti 1
- Tasmania 1
- Travel 1 ∧ less