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12 yards 6-yard sub-base 60 yards accuracy adjusting key Aldershot base A C battery calculation captive balloons carried Chapter coincidence correct crosshead distance double yards drill field range field telemeter find the base finder fix the right flag ground half yards history sheet holding the instrument horizon glass Horse and Field Inaccuracy index glass instruction Instructor in Range-finding left hand length of base Mark Mark IV metallic cord movement Moving Objects non-commissioned officer observation officer commanding pace picket head picket leg position rack knob range-finding equipment Range-finding under Cover range-taker reflected image regulator right hand right-angle picket right-angle pointer Royal Arsenal Royal Artillery scale Section setting screw setting the base short arm shuttle steel bar steel tape strap take a range take ranges take the range telescope tripod pickets true range turning the cylinder waist-belt Watkin Field Range-finder Watkin Range-finder Woolwich zero