>From: P.Field <[EMAIL PROTECTED]> >To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
>That type of ring dial is known as a Universal Ring Dial. The middle piece is >a flat piece that divides the >outer ring in two, such that when the ring is suspended by the adjustable holder, and points to the NCP. >The middle piece is graduated for the time of year (Month, Date) and has a >seperate piece that slides along >this graduation. The piece that slides has a hole that projects the Sun onto the inner ring. The inner ring is >graduated to show the hours and is at 90 degrees to the outer ring. >The reason the middle piece moves (along the date(s)) is to correct the dial >for the equation of time. No. The reason is the declination of sun. >Note: This type of sundial (Universal Ring) was given to George Washinton by >the Marquis de Lafayette. >Does this help? Answer the question? It's propably misunderstanding. You are describing equatorial, universal dial. I know that kind of dial, my question was about "pure" ring dial (see atachement). Thanks for inspiration. Jan Kulveit Jan Kulveit tel/fax: +420-2-6882506 [EMAIL PROTECTED] [EMAIL PROTECTED]
