The method of finding the longitude at sea, by time-keepers: to which are added, tables of equations to equal altitudes. More extensive and accurate than any hitherto published. By William Wales, F. R. S. And Master of the Royal Mathematical School in Christ's Hospital.

Wales, William, 1734?-1798.

Date:: 1794

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London : printed by C. Buckton, Great Pulteney Street, Golden Square, for the author; and sold by him in Christ's Hospital: also by F. Wingrave in the Strand, J. Johnson in St. Paul's Church Yard, W. Richardson in Cornhill, and all other Booksellers, 1794.