Fellow Shadow Watchers,
One presentation at the recent BSS Conference
referred to a series of planned dials using sunrays passing through
circular holes onto walls/ceilings. This brought to mind recent postings
which mentioned placing a spherical 'bead' in the aperture so that the
sunlight was passing through an annulus to yield a light spot with a
sharp central shadow - if I remember it correctly.
1. Does anyone have these postings conveniently saved or can recall
their approximate date?
2. I also seem to remember noting that all postings to this mailing list
are archived somewhere so given the date and archive address my
correspondent could look them up for himself.
Thanks in anticipation
Tony Moss.
