http://www.uni-mannheim.de/mateo/camenaref/witte/witte5/books/wittememoriae5_1_10.html

Keine Beschreibung vorhanden.

Clock Time-Line

http://wayback.archive.org/web/20120421092041/http://www.ahsoc.demon.co.uk/timeline-clk.html

The Antiquarian Horological Society (AHS), is a learned Society dedicated to the study of antiquarian clocks, watches and other forms of timekeeping.