O.K., I really wish I had a video camera, but I don't. So, you have to take my word for it. Here is what I just did. I took two 4' pieces of straight 1/8" plywood and put them on my table. I took the first one and made sure it was parallel to the long rail. Then I put a stiped ball one inch from the end, and another striped ball about a foot back from it. I then put the other plywood board up against the two balls, leaving just a hair of play between the ball and the boards to make sure they were flat on the cloth.
Then I shot with no english. The end ball came straight back into the 'groove'. Then I put left english on the 'cb'. The end ball did have rotation on it, and came back about an inch to the right of the groove. The opposite same effect with right english.
So, you CAN transfer spin. Probably not as much as most people think, but there is a definite effect.
When shot with only the left board in place, and using left english, there was a much more pronounced effect. That tells me that the ball threw to the right. With both boards in place, it could not throw, but there still was a smaller effect.
I did this on a bar box, length wise. And the ends of the boards were at a little over half table.