It may that Part 2 would have been on sundials; apparently it was never published. I don't recall seeing that many sundials at the Time Museum.
At present, I am more interested in the "plain sights" of the large astronomical instruments with nontelescopic sights which were built by Tycho Brahe and Johannes Hevelius. The sights were remarkably good, with reproducibility as good as 10 arc seconds (Hevelius), although overall instrumental accuracy for stars was more like 20 to 60 arc seconds. The position of the sun was measured by centering the edges of a pinhole-projected solar image on four slits, in the event someone wishes to try the method on a sundial.
Over this last year I have been studying about water clocks, starting with Part 3, and going on to a great many of the cited works. There is also some additional modern research on the subject, primarily concerning hydraulics. I published a brief list of these newer articles in the NAWCC Horological Science Chapter Newsletter and can send it to anyone interested.
Best wishes, Gordon Gordon Uber [EMAIL PROTECTED] San Diego, California USA Webmaster: Clocks and Time: http://www.ubr.com/clocks -
