Originally Posted by
William W
I believe my original statement is correct.
The terminology originally used was “Horizontal run shutter".
I am in France at the moment but I am quite confident that my authoritative texts in my office in Sydney will support my original post.
If you have any First Reference Sources which supports the claim that ‘horizontal’ and ‘vertical’ refer to the orientation of the slit and NOT the direction of travel, then could you please post same.
WW