Sperry Automatic Pilot

In aviation, a contrivance fulfilling important functions as an automatic pilot, a clinometer, ajad.a gyroscopic reference plane. … Drift Indicator. — A prismatic monocular … telescope mounted in such a way that a clear vision of the ground below may be obtained. A pointer secured to.the telescope makes Jt po ible to read on a graduated scale the angle between the true course By taken by the connecting aeroplane and indicated with by the compa . a device this 'that instrument the compa , the pilot is able to correct for drift and keep the machine in the desired course. The weight of the combined instruments is only seven pounds. Sparry Searchlight — A searchlight designed for various military and. naval purposes, has a candle power of more than one and a quarter billion, which enables it to illuminate a ve el until the ve el dips below the horizon. Its effectivene is due to small electrodes, to the special or impregnated carbons used, to the manner in which tney burn, and to the large parabolic mirror reflecting the light. The voltage acro the arc is about 75. The light may be used for signaling up to 100 miles.