Hi Willy, No, but I bet it looks like this. Best wishes Chris ----- Original Message ----- From: Willy Leenders To: Sundial sundiallist Sent: Thursday, April 08, 2010 7:22 PM Subject: Drawing that belongs to the theorem of Emerson
This is the address where you can find "Dialing or the art of drawing dials" (1770) by William Emerson: http://books.google.be/books?id=-bk2AAAAMAAJ&pg=PA177&dq=%22william+emerson%22+art+dialing&ei=Iya7S9yoLYSqywTRh_k5&cd=8#v=onepage&q&f=false On page 42 (page 220 of the scanned pages) you can find proposition XXIV: "In any dial whatever, if a line be drawn parallel to any hourline, to intersect the other hour lines, and note the sixth hour line from this. Then any two hour lines on each side this sixth, which are equidistant in hours, will also be equidistant along this parallel line." (known as the Theorem of William Emerson). The drawing (fig. 11) used in the proof of the theorem is not scanned. Can someone send me that picture? Willy LEENDERS Hasselt in Flanders (Belgium) [email protected] Visit my website on the sundials in the province of Limburg in Flanders (Belgium) and on worthwhile facts about sundials www.wijzerweb.be ------------------------------------------------------------------------------ --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
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