Message text written by INTERNET:sundial@rrz.uni-koeln.de >I'm sure there must be many list members conversant with fluid flow who might be able to comment on a possible alternative which occurred to me viz. is it at all likely that turbulence caused by the deeply-incised lettering would somehow cushion the lettering and its immediately surrounding areas and protect them from wind-borne sand etc. while flat areas took it full in the face?<
Very interesting - it would be nice to know. We do see this effect quite a lot on very old UK dials and most such dials are South -ish facing - at least I have not recognised any trend to say that this effect is only present on dials with certain declinations. Aren't our winds predominately from the SW? I suspect that if it were caused by wind generated turbulence we should expect to see some bias in the weathering to one side of the letters. I don't recall that but will now try and have a look! (Anything to divert me from decorating...!!) Patrick ------------------------------------------------------------------------- Forwarding addresses: E-Mail: [EMAIL PROTECTED] Web: http://www.dunelm.org.uk/homepages?patrick_powers Lat: N 51d. 49m. 09s: Long: W 00d. 21m. 53s -
