At 13:47 7-6-00 -0700, you wrote: -----Original Message/Oorspronkelijk bericht-------------- > > Why is there a gap in the wall, about noon (1300 Summer Time)?
Release of rain water, so no dirt will build up there. >Above the gnomon, there appears to be a small pyramidal point, that would >cast a shadow inside the bright spot, at local noon? It is a screw with cap to fix the dialface in order to get the correct longitude correction. >Does the gnomon cylinder look tilted to anyone else? (Not perpendicular to >the dial plate) They are perpendicular. >Very interesting design! > >Dave > > >> From: Andrew James <[EMAIL PROTECTED]> >> To: 'Steve Lelievre' <[EMAIL PROTECTED]>; Sundial mailing list >> <[email protected]> >> Sent: Wednesday, June 07, 2000 9:38 AM >> Subject: RE: Water filled sundial at Herstmonceux >> >> >> > There are a number of these around (the one I remember seeing is at the >> > Manor House Museum, Bury St Edmunds) - it's a registered design but I >> can't >> > remember the details though I think it was 1960s or perhaps later. >> > Basically the cylinder and liquid acts as a cylindrical lens which focuses >> a >> > bright spot (the intersection of a bright line with the equatorial plane) >> > onto the scale. It only works in summer because it's an upper surface >> > equatorial! It would work with solid plastic or glass but I expect that >> it >> > is made like that because liquid filled is cheaper ... >> > >> > Andrew James >> > >> > -----Original Message----- >> > From: Steve Lelievre [mailto:[EMAIL PROTECTED] >> > Sent: 07 June 2000 16:29 >> > To: Sundial mailing list >> > Subject: Water filled sundial at Herstmonceux, England, ... >> > ... >> > photo is at http://www.ualberta.ca/~droles/astro/astrav/Sun2.html > > ----------------------------------------------------------------- T. & M. Taudin-Chabot, home email: [EMAIL PROTECTED] (attachments max 500kB, in case of larger attachments contact me)
