The common form of non-automatic coupler, used in Great Britain for goods wagons, consists of a chain and hook; the chain hangs loosely from a slot in the draw-bar, which terminates in a hook, and coupling is effected by slipping the =chain of one vehicle over the hook of the next.
X is the mirror rotating about the point E, and placed so that (if EB is the horizontal direction in which the rays are to be reflected) (I) the normal CE to the mirror is jointed to BC at C and is equal in length to BE, (2) the rod DBC passes through a slot in a rod ED fixed to, and in the plane of, the mirror.
Note also how the slot in the top of the centreplate casing has been extended aft by about ten inches.
It rotates by inserting a screwdriver into the slot in its side.
Lunch spaces You can pre-book a half-hour slot in one of our lunch spaces during your visit - please enquire when making your booking.
