Sight clinometer MK IV used in conjunction with the QF 25 PDR field gun. Complete with leather protective transit case, standard equipment issued with the 25 PDR artillery piece. Refer to 00111.1 and 00111.2ww2, sight, 25 pdr, qf 25 pdr, 25 pounder, field gun, sight clinometer mkiv

Used in WWIIUsed in WWIIClinometer Mk IV: Vickers Machine gun brass and steel. Used for sighting long range fire or a fixed fire line of fire for a Vickers .303 inch machine gun. The top of the clinometer contains a spirit level and at each end there is a brass and steel winder that can depress or elevate the clinometer from minus twenty degrees to plus twenty degrees. The brass scale is graded in five degree units. At the bottom of the clinometer is two brass lugs and a brass steel spring loaded small plate, used for attachment to a Vickers machine gun. Serial number 809.The front face plate has markings: DEP DEGs and ELEV DEGs. The scale is marked in one degree increments numbered in five D degree increments to the left, and five E increments to the right. The left winder is marked from zero to fifty degrees in ten D degree increments. The right winder is marked from zero to fifty degrees in ten E degree increments. The rear face is marked: 1940, the letters TS inside a circle, and No 809. It also has CLINOMETER SIGHT (MARK IV) markings.clinometer, wwii, vickers, machine gun, sight