Message text written by INTERNET:sundial@rrz.uni-koeln.de >This request is not limited to tubes. Any clever idea is welcome.<
How about the Liberation Monument WW2 Memorial, St Peter Port in Guernsey? That is calibrated so that on the anniversary of the Island's liberation (May 9th I think) the show of a column passes over the plaques each containing the name of one who died. Patrick -