I like it!! Printing the dial artwork on transparency film should work well. Rub it down onto a thin sheet of glass supported in a frame, perhaps with a film of water or the like to keep it in place. The frame would need to be accurately leveled and oriented, but could easily be clamped in position, once that is determined. One hitch might come in, if the mirror is placed on the inside sill of a fixed picture window, making it hard to get the dial center over the mirror...
Dave 37.29N 121.97W On Wed, 2 Jan 2002, J Lynes wrote: > Here's a simpler proposal. > Transfer the declination lines and hour lines of a horizontal sundial onto a > transparent sheet. > Mark a small circle on the centre of the mirror. > Support the horizontal transparent sheet, rotated from north to south, with > its nodus vertically above the centre of the circle, at a distance equal to > the height of the transparent sundial's gnomon. > Project a laser beam through the transparent sheet onto the centre of the > circle. Make sure the beam passes through the sundial scale at a point > corresponding to some chosen time and date. > The reflected spot on the ceiling is the appropriate point on the ceiling > sundial. > Repeat for other dates and times. > John Lynes >
