Sperry Aircraft Gyropilot Model A-3 Instruction Manual 1940 Armée de l'Air thus putting the fixed lubber

thus putting the fixed lubber lines of the pelorus on this line

as used in versions of the German Luftwaffe jet aircraft Me 262

but could be replace with fresh fluid

The manual is about 3/8 inch thick by 6 inches by 9 inches

Sperry Aircraft Gyropilot Model A-3 Instruction Manual 1940 Armée de l'Air thus putting the fixed lubberThis is an authentic reference Sperry Aircraft Gyropilot Model A 3, Instructions No. 15 728A dated December 1940. The Gyropilot was an early automatic pilot system developed by Sperry which quickly became the standard system for private, commercial, and military aircraft of the day and during early WWII. This manual covers the 3rd generation of the Gyropilot: Model A 3, and its installation, operation, and maintenance. It is in reasonable condition