With reference to this photo:
http://people.timezone.com/mdisher/decorte/gyro2/gyro2_3.jpg David Bell [mailto:[email protected]] wrote: I see how the kidney piece works, but what's with the oddly shaped Month wheel? It indicates the number of days in the given month. If the timepiece was a perpetual calendar there must have been some additional mechanism for February. Bob _____ From: David Bell [mailto:[email protected]] Sent: Tuesday, June 21, 2011 10:51 PM To: Robert Terwilliger Cc: <[email protected]>; <[email protected]> Subject: Re: EoT diagram I see how the kidney piece works, but what's with the oddly shaped Month wheel? Sent from my iPhone On Jun 21, 2011, at 12:55 PM, "Robert Terwilliger" <[email protected]> wrote: The equation graph projected on a circle is used as a "kidney piece" cam in a watch movement that can indicate the equation. Here is a picture of the gear carrying the kidney piece. It turns once a year. <http://people.timezone.com/mdisher/decorte/gyro2/gyro2_3.jpg> http://people.timezone.com/mdisher/decorte/gyro2/gyro2_3.jpg Bob _____ From: [email protected] [mailto:[email protected]] On Behalf Of Chiu ?,Chi lian Sent: Tuesday, June 21, 2011 12:11 PM To: <mailto:[email protected]> [email protected] Subject: EoT diagram Hi, I figured out a way to plot EoT curve which I didn't see in sundial books I own. Diagram is enclosed here. For a better resolution one, see <http://dl.dropbox.com/u/31382133/EoT%20.png> http://dl.dropbox.com/u/31382133/EoT%20.png Best regards, ChiLian 24.8N 121E --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
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