Re: backward ray tracing

On Feb 22, 12:16 pm, AES <sieg...@xxxxxxxxxxxx> wrote:
In article
<c76cef5f-e264-4f26-be29-e759e9033...@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
 Helpful person <rrl...@xxxxxxxxx> wrote:

I'm not familiar with Prof S., probably after my time.

I'm afraid I was probably *before* your time . . .

   --Prof S.  (still around, though fading steadily)

Then you must remember using Conrady's formulae for ray tracing using
Monroe and Marchant calculators. (Just a little before my time.)

.