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[[image - photograph of the The Sperry Horizon]]

The Sperry Horizon...

Since the natural horizon is the reference which a pilot is instinctively trained to use, the Sperry Horizon has been designed to replace the natural horizon; thus giving an attitude indicator which has no time lag; which does not require interpretation; and which provides a guide that the pilot can instinctively and naturally depend on without "concentration fatigue." 

THE TEXAS COMPANY
135 EAST 42nd STREET
 NEW YORK 

[[boxed]] 
SPERRY GYROSCOPE CO. 
RECEIVED 
AUG 19 1931
REFERRED TO | Approved
[[signature]]
[[signature]]
August 18, 1931
ANS.
[[/boxed]]

FRANK M. HAWKS
AERONAUTICAL ADVISOR

Sperry Gyroscope Company, Inc. 
Manhattan Bridge Plaza,
Brooklyn, New York. 

Gentlemen:

Now that the Sperry Gyro Horizon has been installed in my ship "Texaco #13" and I have given it a thorough test in blind flying, I want to say with all sincerity that I feel safer than I have ever felt before when flying in thick weather. 

On my recent trip to Chicago the take-off from New York was effected in rather heavy rain with a low ceiling and poor visibility. After a short ten minute test to ascertain that the instrument was functioning, I pulled up into the fog and remained in it for one hour. The instrument functioned perfectly and I was able, at all times, to know my position accurately. You will appreciate that this is somewhat of a test because of the sensitiveness of the plane I fly and by virtue of its high speed it has a very rapid climb and descent in ration to the angle of either. The Sperry Gyro Horizon registers these manouvers very quickly and accurately. 

The development of this instrument deserves great praise and please accept my humble congratulations upon the success you have attained with it to date. 

Yours very truly,

Frank Hawks


FMH:DE

Safer FLYING 
[[image]]

     CAPTAIN FRANK HAWKS, like many other seasoned pilots, recognizes the fact that every precaution must be taken to make and keep flying safe. That is why he uses the Sperry Gyro-Horizon in his high speed sensitive plane.
     Over four hundred Horizons are now in use on planes of all types from training ships to the largest passenger carriers. 

                         Complete data sent on request.

     The SPERRY DIRECTIONAL GYRO                 
[[image]] 270 DIRECTIONAL GYRO SERIAL NO. [[/image]]
THE Sperry Directional Gyro is an airplane navigating instrument for indicating to the pilot the compass course of his plane. It has no meridian seeking properties and therefore must be occasionally checked and re-set in accordance with the heading as given by the magnetic compass. Unlike the magnetic compass it does not oscillate on turns or in rough air. It can also be used as an extremely accurate index of turn for flight purposes. 

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[[figure]] A DIVISION OF NORTH AMERICAN AVIATION INC. [[/figure]]
SPERRY GYROSCOPE CO., Inc. 
   BROOKLYN - NEW YORK 
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