>I can see that in abstract terms that we have dials which are > >- projection of a point onto a surface (perhaps curved) >- projection of a line (perhaps curved) onto a surface (perhaps curved) >- projection of two lines (perhaps curved) onto a surface (perhaps curved) >- other non-projection types, such as the wonderful CD-diffraction dial.
You forgot (at least) one: - projection of many lines onto a point on a surface. (see NASS Compendium Vol.1 nr.3 page 6 or BSS bulletin 91.2 page 14) ----------------------------------------------------------------- Thibaud Taudin-Chabot 52°18'19.85" North 04°51'09.45" East home email: [EMAIL PROTECTED] (attachments max. 500kB; for larger attachments contact me first)
