Does anyone know where, if I may, get an online copy of the original translation of Vladimir Nabokov's Laughter in the Dark in English, entitled Camera Obscura, translated by Winifred Roy in 1936, then attributed to Vladimir Nabokoff-Sirin?
Unfortunately, I think it will be difficult to find it. John Colapinto writes in his article for "The New Yorker":
The obvious solution would be to buy or borrow a copy of Roy's translation and compare it to Nabokov's, but that’s almost impossible to do. “Camera Obscura” sold only a handful of copies upon its release, and the London warehouse containing the unsold stock was destroyed by German bombs during the Second World War.
You can read the full article there.