The Optics (Opticae Thesaurus...) , Eusebius Episcopius
& Nikolai, Basel, 1572, titlepage with examples of the application
Charles Saltonstall, The Navigator, printed by Hurlock, London in 1636 and a fine indication of the self-image of seafaring folk.
This book is a sensational structure of drawn grids for navigators with the most minor and, to me, incomprehensible variables. I have owned it for thirty years without understanding it, but loved it for its dogged accuracy and superb colour variables within the Grid. It measures 36 x 22cms.