Reference numberCLP/8ii/44
TitlePaper, 'A spirit level to be fixed to a quadrant for taking a meridional altitude at sea when the horizon is not visible' by John Hadley
DescriptionHadley states that 'The necessity of seeing the horizon, in order to find the latitude of a ship at sea, has always been so great an inconvenience. Any method for determining it without the help of the horizon, will be of considerable use.' His spirit level consists of a glass tube bent into a curved shape, 'containing such number of degrees as will be most suitable to the degree of exactness with which the observation can be made', and filled with liquid.

Subject: Astronomy / Navigation / Scientific apparatus and equipment

Read to the Royal Society on 10 January 1733

Published in Philosophical Transactions as 'A spirit level to be fixed to a quadrant for taking a meridional altitude at sea, when the horizon is not visible'
Physical descriptionInk on paper
Digital imagesView item on Science in the Making
Access statusOpen
Related materialDOI: 10.1098/rstl.1733.0031
Related records in the catalogueRBO/18/60
Fellows associated with this archive
NA7954Hadley; John (1682 - 1744)1682 - 1744
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