CD Diffraction Sundial

1999-04-26 Thread Roger Bailey
I was throwing out a junk CD recently when I was struck by the beauty of the coloured patterns of reflected diffracted sunlight. Being curious I got out a protractor and measured the angles for different colours at different orders of refraction. Revisiting an old Physics text and visiting a few

Bion: "Construction and use ..." 1758

1999-04-26 Thread John Pickard
Friends, A short time ago someone (my aplogies, I forget who) asked me for sources of Bion's wonderful book. I suggested Rita Shenton. Another source appeared in my letter box the other day" Roy Arnold 77 High Street Needham Market Ipswich England IP6 8AN Phone 01449 720110 Fax 01449 722498 e

Re: Used Theodolites

1999-04-26 Thread Fernando Cabral
Anton Reynecke wrote: > Fernando, > > I have seen some advertisements a Survey magazine for what you are looking > for. > It is priced around ten thousand Rands (and a little under) which translates > to about $1600(US), but know how much you are prepared to pay...and shipping > and must be added