Holwell, John, 1649-1686?
Clavis horologi4&t; or, A key to the whole art of arithmetical dyalling, in two parts ... Whereunto is annexed an appendix, being The explication of the pyramidical dyal set up in His Majesties garden at White-Hall, 1669 ... by Francis Hall ... By John Holwell ...
London, Printed by Will. Bonny, for Tho. How-
kins in George-Yard in Lombard-Street. MDCLXXXVI. [1686]
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