Sundial, Sextant and Ring-sundial

Sextant and Ring-sundial:  desigh Klaus Hûnig -  SunWatch Verlag Essen;  these are realy functioning instruments! 

Sunbeam equatorial sundial: From the book Sundials and Timedials by Gerals Jenkinds and Magdalen Bear. published by Tarquin Publications 1987.