Found in 7 Collections and/or Records:
Concerning a chart for finding longitude and a method of finding longitude by two proportional quadrants. Includes a letter of recommendation from the passengers and crew of HMS York where Titford's chart for longitude was tested on a voyage to Jamaica in 1813, as well as latitude and longitude figures from a voyage of HMS Mary Ann to Jamaica in 1822.
Testifying that a method for ascertaining longitude was invented and tested by William Titford on a voyage of HMS York from England to Jamaica, between 22 April and 14 June 1813.
Sent to Dr Thomas Young.
Originally enclosing papers and charts for finding longitude.
As tested on HMS York.