An essay, wherein a method is humbly propos'd for measuring equal time with the utmost exactness [electronic resource] ; without the necessity of being confin'd to clocks, watches, or any other horological movements; in order to discover the longtitude at sea
The dedication signed: James Clarke. Reproduction of original from the British Library. Available online to authorized PSU users as part of the Medicine, science, and technology series of Eighteenth century collections online.
Electronic reproduction. Farmington Hills, Mich. : Thomson Gale, 2003. Available via the World Wide Web. Access limited by licensing agreements