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First edition. The 1714 Longitude Act was established the Board of Longitude and offered monetary rewards for anyone who could find a simple and practical method for the precise determination of a ship’s longitude. It was modified in several subsequent Acts, including the present, making another £2000 pounds available for experimentation and recording that John Harrison had received £1250 for his initial determinations.

Though separately published with a general title for a complete sitting of Parliament, individual Acts of Parliament were paginated to be bound together in yearly volumes hence the pagination 399-403 here.

A rare pictorial guide to naval ensigns. This 1807 issue in book form is made up from all 18 portions of an engraved chart first issued by Heather in 1800, with an added letterpress label. The flags include all the known naval ensigns, including those of privateers and pirates. 125 naval ensigns begin with the principal British flags and continue with those of all the major European countries and their principal ports, then China, Persia, the United States and the major trading companies, such as the Dutch and British East India Companies. There are two pirate flags, entitled ‘Rovers’, and ‘Algerine Rover’ [Barbary Pirates]: the ‘Rover’, coloured red, is marked with a winged hourglass, a raised arm holding a cutlass and a skull and cross bones; the ‘Algerine Rover’ is also coloured red but marked with a skull.

The 1800 chart bore an engraved dedication at the head ‘To the Right Honourable the Master Wardens, elder Brethren of the Trinity House’ not used in the book, though the Trinity House arms are added as a cover label.� Rare, especially in book form. Worldcat lists the National Maritime Museum and UCLA copies only.