National Geographic : 1941 Nov
The "Gasoline Cowboy" Must Learn to Steer Without a Wheel With the two levers he controls separately the speeds of the treads on each side of the tank. By slowing down one tread, he causes the tank to turn. This cross section of the driver's compartment is part of the equipment of a Canadian tank school. Baleful Eyes of an Unborn Tank Glare from This Periscope Here a worker looks through anew instrument, his eyes being reflected in the upper mirror. This device, since itprojects up through thetank's armor, allows the operator to see out without exposing hiseyes toshell splinters in an eye slit (page 583).