Aeroplane Construction and Operation

by John B. Rathbun

One in pilot's cockpit.

Sperry type. To be located in pilot's cockpit.

For measuring angle of inclination of longitudinal axis of machine. In pilot's cockpit, and placed on instrument board in the vicinity of tachometers.

For indicating the proper amount of bank on turns. In pilot's cockpit.

One revolving map board placed in pilot's cockpit.

One folding map desk in observer's cockpit.

Fig. 15. Sperry Ground Drift Indicator.

For measuring speed of motors in revolutions per minute. Pilot's cockpit.

For operating self-starter. On instrument board in pilot's cockpit.