> > >One of the fascinations of dialling for me is the still-unexpected richness >of the field, going beyond, as it does, the simple matter of an alternative >to a clock. On this latter point, a clock is used for telling the time but >also for measuring elapsed time - as an egg-timer does. Does anyone know of >a gnomonic method or device to measure short periods of time (say, four and >a half minutes) separately from telling the time ? > > If you use some optics to give you a sharp image it is easy to see a few seconds of solar motion. Maybe that is out of the realm of gnomonics?
Peter -- Peter Hirtle [EMAIL PROTECTED] Seattle, WA.
