The description and use of the dovble horizontall dyall.
Subtitle: Whereby not onely the houre of the day is shewn, but also the meridian line is found, and most astronomicall questions, which may be done by the globe, are resolved.
By: Invented and written by W.O.  Whereunto is added the description of the generall horologicall ring.
Publisher: W. Leake
Published: 1652
Place of publication: London
Language: eng
Number of pages: 16
Subjects: Sundials
Notes: Bound with Leurechon, Jean.  [Mathematicall recreations. London, 1653]