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U.S. AIR SERVICES

Devoted to the Development of Aeronautics-Civil and Military- in the United States, Birthplace of the Flying Machine, and Throughout the World

VOLUME XVI AUGUST, 1931 NUMBER 8

Contents
RAYCROFT WLASH-Photograph on Cover
WASP-POWERED BOEING FIGHTERS FROM SELFRIDGE FIELD-Frontispiece
SPORT FOR SPORT'S SAKE-An Editorial
GENERAL FOULOIS NEW CHIEF OF AIR CORPS-An Editorial
SHRINKING THE GLOBE (Illustrated) . . . . . . BRADLEY JONES
TENTH ANNUAL CONVENTION OF THE N. A. A.
SIKORSKY S-39-A Page Photograph
1931 NATIONAL AIR TOUR EFFECTIVELY PROVES AIRCRAFT EFFICIENCY . . . . . . . . . . . DON MOCKLER
AIR DEFENSE FROM THE VIEWPOINT OF THE AIRCRAFT INDUSTRY . . . . . . . . . . CHARLES L. LAWRANCE
LET'S GO TO THE ELMIRA SOARING MEET . . HATTIE MEYERS BARNABY
LIGHTNING INVESTIGATION AS APPLIED TO THE AIRPLANE (Illustrated) . . . . . . . . . . . . A. O. AUSTIN
COMMENT AND REVIEW . . . . . . . . . . . NEO-AEROBIA
A PHOTOGRAPH, NOT A PHANTASY-INTERESTING VIEW OF THE AUTOGIRO
DEPENDABILITY IN PROPELLERS
FAST AND PATRIOTIC HUNGARIANS CONQUER ATLANTIC
MAN-MADE BIRDS-Verse . . . . . . HELEN MOORE SCHROEDER
NATIONAL AIR RACES AT CLEVELAND THIS MONTH (Illustrated)
AIR-MAPPING THE CANADIAN NORTHLAND (Illustrated) JAMES MONTAGNES
DID YOU HAPPEN TO HEAR? (Illustrated)
TO POST AND GATTY-Verse . . . . . . . . . . FRED H. COLVIN
FIRST ANNUAL INVITATION AIR CRUISE
CURTISS "HELLDIVERS" BEING BUILT FOR THE NAVY (Illustrated)
NEW HIGH COMPRESSION SUPERCHARGED "HORNET" (Illustrated)
HAWKS BRINGS HOME FROM EUROPE AND EXTRAORDINARY LOG NAVY'S MARTIN TRIMOTOR PATROL BOAT NATIONAL BALLOON RACE

Entered as Second-Class Matter August 25, 1921, at the Post Office at Washington, D.C., under the act of March 3, 18789.

PUBLISHED MONTHLY BY THE AIR SERVICE PUBLISHING CO., INC., WASHINGTON, D. C.
Price in the United States and Insular Possessions, 35 cents; $3.00 a year-Canada, $3.56; Foreign, $4.`1.

EDITORIAL AND EXECUTIVE OFFICE: TRANSPORTATION BUILDING, WASHINGTON, D. C.

Editor, EARL N. FINDLEY
Associate Editor, THOMAS R. REED, SAN FRANCISCO Associate Editor, BRADLEY JONES
Secretary, FLORENCE O. BERGSTROM Special Representative, FRED F. MARSHALL
Chicago Representative, F.W. MORAN, 307 N. Michigan Ave. Boston Representative, ROBT. C. DALY, 368 Congress St. Washington Representative, GEORGE A. GRAY