Men from the line getting aquainted with a cinema machine before giving shows up the line

Soldiers looking at a film projector, France, during World War I. An officer is showing a small group of soldiers how to work a cine film projector. The officer has the Royal Arms as a cap badge. This suggests that he is on the General List which included officers not assigned to particular regiments. The men being taught may be from a number of regiments. The corporal on the left has the letters …