Letter to Richard Guy Ash about a dicyanine experiment

From The Arthur Conan Doyle Encyclopedia

This undated letter was written by Arthur Conan Doyle to Richard Guy Ash, a dentist from Crowborough.


My dear Ash

I'll be home on Wednesday. I shall be very interested to hear from you — or to see you on Thursday — and learn where we are now in our dicyanine experiment. I don't know if you have done anything. The great thing would seem to be to have two slightly concave slides & imprison the dicyanine between them. What he means by the 'light' screen as distinguished from the dark are I don't know.

Yours sincerely
A Conan Doyle

Order anything you wish & put it down to me.

  • Source: Brian Pugh Collection.