The longitude not found, or, An answer to a treatise written by Henry Bond, Senior, shewing a way to find the longitude by the magnetical inclinatory needle wherein is proved that the longitude is not, nor cannot be found by the magnetical inclinatory needle / by Peter Blackborrow, Gent.

[8], 78 [i.e. 72] p., [7] leaves of plates : ill."Licensed March 14, 1677/8. Ro. L'Estrange"Reproduction of original in British Library