A WWII Palmer Mark IV clinometer sight, dated 1943.
Width: 14 cm.
Height: 8 cm.
Brass and steel clinometer, used for sighting a fixed line of fire for 13 Pounder and 18 Pounder field guns or a Vickers Machine Gun. The top of the clinometer sight contains a spirit level with brass winders at each end that can depress or elevate the sight from twenty degrees depression to twenty degrees elevation. There are two spring loaded brass claws to facilitate attachment to the chosen weapon system.