At the risk of getting into something that smacks of pushing celestial bodies around pin heads with this Ramsay, Kaps, Malini subtiety business, I have to say that I am not convinced that the so-called Malini and Kaps subtieties are the same. Both, as well as the Ramsay subtiety all have the same purpose to hide a palmed coin (finger or classic)while apparently either showing or creating the assumption that the hand is empty.
While I can only evaluate the Malini version by what is printed in "Malini and his Magic", I did have the opportunity to see Fred Kaps use this technique a number of times in both public and private performances. Other than print, we do have the few film clips of Ramsay as appear on the Galloway videos.
The Ramsay subltety appears to be the display of the palm with a coin in finger palm creating the impression that the hand is empty. The use of the finger palm rather than the classic palm seems to be the primary difference between Ramsay's technique and those of Kaps and Malini which have the coin classic palmed.
The Malini technique both in illustration and description, as I understand it, seems to create an impression the hand is empty without showing the palm. Indeed, the text says "In other words, the angle of his right hand prevented the specatator from seeing into the palm". The text goes on to state "This created a wonderful effect, as the spectator had the impression of seeing both ands, but he only actually saw the left palm."
Kaps, on the other hand (I couldn't resist). showed as much of the palm side of the hand with the classic palmed coin as possible. The description in "Fred Kaps' Purse" edited by Anthony Bramhams (page 7) of the "Hiding Principle" is pretty much as I remember Fred doing it. However, he did not always have another coin at the fingertips. He also used the "hiding principle" when there was only the classic palmed coin. The ball of Fred's thumb would hide the palmed coin when he angled his hand toward you. You saw palm and you were certain you had seen the entire hand to be empty.
Ergo Richard, I feel you were probably correct to label this the Kaps subltety and that it is, in fact, a different technique than that now being called the Malini subltety. I guess I will have to present my point with Jamy as well the next time I see him.