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Bill Gottesman Precision Sundials LLC Renaissance Focusing Sundial. A “Watch” accurate dial using Focused Light. Notable Features. Modified Equatorial Dial Scale is Expanded Uses Focused Light Adjustable for Latitude, Eot, and Daylight Savings Software assists alignment
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Bill GottesmanPrecision Sundials LLC Renaissance Focusing Sundial A “Watch” accurate dial using Focused Light
Notable Features • Modified Equatorial Dial • Scale is Expanded • Uses Focused Light • Adjustable for Latitude, Eot, and Daylight Savings • Software assists alignment • C. M. Lowne in BSS Bulletin 98.1 independently reported similar idea for focusing sundial. • US Patent 6,301,793
Modified Equatorial Dial • Equatorial Circle is expanded into a helix to increase its rigidity. • Readable on Equinoxes • Helix connotes the passage of time
Mirror is 6 minutes wide, but image is focused to 2 minutes across, the same as the sun in the sky
Cylindrically ground mirrors keep the image in focus at all times
Adjustable wedges allow sturdy and accurate setting of latitude
New Developments • Focused beam is 2 minutes of time wide. Can this be made narrower to allow a more precise reading? • Not with the beam itself, but… • By casting two beams adjacent to each other, the space between them can act as a cursor, and be made as narrow as one desires, even to just a few seconds of time.
End Sawyer Equant Schmoyer Sunquest
Like a concave spoon, image inverts when moved away from mirror.