^FOREWORD

This Manual contains harmonization data supplemental to that issued in technical orders and consolidated simplified aircraft ballistic data extracted from aircraft firing tables. The harmonization patterns were compiled at the proving ground

command to facilitate the conduct of service tests on aircraft weapons. The ballistic data was supplied by the Chief of Ordnance, Ballistics Branch. These types of data are combined in a single publication for general use by Army Air Forces officers. Further work by the Proving Ground Command and other field installations will be disseminated in revisions to this Manual. The patterns for harmonization

contained herein are indorsed by Army Air Forces but may be amended by each individual station in accordance with local conditions to obtain effective fire power.