Hadley, John, 1682 - 1744 (natural philosopher and mathematician)
Found in 5 Collections and/or Records:
An undated account of John Hadley's quadrant and its capabilities and effectiveness for observations at sea.
A set of loose pages dealing with problems in ascertaining latitude and longitude at sea by observation of the stars, with descriptions, computations and formulae referred to apparent time. There are also sections on finding the Moon's longitude from the nautical ephemeris [RGO 4/196: 1r], the motion of the Sun's image in a Hadley quadrant [RGO 4/196: 2r], and the testing of other people's hypotheses.
It is not known if the papers are foliated in their original order.
These include daily observations; Azimuths of the sun; lunar observations; observations for the line of collimation of the quadrant; observations for the latitude of Point Venus by Hadley’s Quadrant; observations for the dip of the needle; observations for the going of the clock; observations for the going of Mr Kendall’s watch; and observations for the latitude of Point Venus.