Hamilton Standard Hydromatic Quick Feathering Propellers Models 23E50-31 & Above with Constant Speed Control Service Manual
Number 140A, Published July 1938, Ninth Edition January 1943 
Table of Contents:
Part I
Introduction
Section I: Model Designation-Hub-Blade
Section II: Principle of Operation
Section III: Performance
Section IV: Description of the Propeller
Section V: Description of Parts
Section VI: Installation Instructions
Section VII: Details of Operation
Section VIII: Propeller Assembly
Section IX: Disassembly Instructions
Section X: Re-Setting the Positive Stops
Section XI: Propeller Balance
Section XII: Inspection
Section XIII: Assembly & Test Specifications
Section XIV: Gear Preload
Part II
Introduction
Section I Thru VIII
Illustrations
Manual is an original.