That is just one camera. One box is the lens, the other box is the camera body and the two film magazines are in separate boxes themselves.
You can see the scale of the lens by the leg and foot of the man behind the lens.
This is the rear of the lens. The square is 9x9 inches. and that is where the film is pressed against the platen during exposure. The lens alone is about 150 pounds. It has the handles so one strong man, but preferably two men can lower it into the camera mount attached to the airplane. The aircraft has a 20 inch hole in the belly so the lens looked straight down.
The mount was gyro stabilized. If the aircraft wings tilted or there was any for aft tilt or yaw it would tilt or rotate to compensate. Amazing technology.
As the exposure (1,000th second) of the rotary shutter the film platen would advance in the opposite direction of the ground according to altitude. So a low altitude flight the film would move more than a high flight to compensate for the forward motion. It would flash a light to the pilot if it was getting close to the limit of compensation so he could slow down if possible.