Harris Shutter and Harris Shutter Effect

Yes Virginia there is such a thing as Harris Shutter, not a commercial product, but a contraption devised by Bob Harris that can be fashioned out of cardboard or similar materials. It is a guillotine like device placed in front of the camera lens, that in raised or cocked position shutters the lens, and after it drops and comes to a stop, it shutters the lens again, in between the leading and trailing curtains, is an opening