Gunsight, Mark 18, Computing Reflector-type, US Navy WWII, Korean War Viscount Measures ~2 inches wide by

Measures ~2 inches wide by ~2

but it is fully intact

which would likely be determined by the type of aircraft to be refueled on a mission

the difference between the totals is the difference in density of the two fuel types

made by Kollsman

Gunsight, Mark 18, Computing Reflector-type, US Navy WWII, Korean War Viscount Measures ~2 inches wide byThe Gun Sight Mark 18 is an electrically operated, computing, reflector type sight designed for use in power turrets and cockpits. The gunner makes the proper settings on the control units, after which it is only necessary for him to "range and track" the enemy plane, for the sight automatically figures the proper point of aim. It makes no difference whether or not the enemy plane is in a pursuit curve, or whether the gunner is strafing a stationary