The mariners compass compleated [pt. 1]: or, The complement of the art of navigation discover'd and propos'd : Being a dissertation concerning the magnetical variations of the mariners compass, and the variation of that same variation, (according to a new hypothesis and system.) As also directions for the use of an universal instrument, invented for ready knowing the variations of the mariners compass, at all times and places / By Z.W.

Dedication to the King & the royal family signed (p. [iii]): Zachariah Williams.
Also reissued in 1745 with cancel t.p., & pt. 2 added.
English Royal bindings.