He used a specialized camera to capture three black and white images in fairly quick succession, using red, green and blue filters, allowing them to later be recombined and projected with filtered lanterns to show near true color images.
I can see that - absolute genius!
Heat wave... forest fires... Russia...... yet no sign of JohnA! :-P
"To communicate anything to a goy about our religious relations would be equal to the killing of all the Jews, for if the goys knew what we teach about them, they would kill us openly".