Roger Bailey wrote:
I tried your Shadow Sharpener test today and was amazed at the result.
Me, too! It was easy, just using the shadows falling on my desk. My pinhole
was made by sticking a paper clip through a Post-It, which I stuck to the
edge of a clip board on my window sill. The gnomon
Message text written by Jim Cobb
I remember many years ago during a partial eclipse looking at the
shade under a young tree. On the ground was a profusion of pinhole
images of the eclipsed sun, formed by the random gaps between the
leaves. Subsequently I've read of this effect in astronomy
Hi Jim,
Thanks for this wonderful unit of energy. I will use it in my next
technical presentation. It beats out my previous favourite, firkins per
fortnight (f/f).
Firkins per fortnight, a unit of volume flow, is most often used as a
measure of beer consumption by engineering students.
Hi Charles:
Your explanation makes a great deal of sense, and it is easy to understand!
There is so much e-mail coming in on this question, that I think I'll wait
to hear what everybody has to say until I make up my mind as to what is
going on.
Because nobody seems really clear as to what the
