Dalton Dead Reckoning Computer Model G Knee Board RCAF PB4Y Privateer The horizon sphere rotates freely

The horizon sphere rotates freely

The rubber cavity for the sextant body has deteriorated with age

BMEP is the acronym for Brake Mean Effective Pressure

This is a 1930's pre-WWII Drift Sight Type A-3 for aircraft of the Air Corps US Army

The gunner took aim at his target by looking through the glass screen mounted on an optic head the bottom of the sight

Dalton Dead Reckoning Computer Model G Knee Board RCAF PB4Y Privateer The horizon sphere rotates freelyThis is an Aircraft Navigational Computer, Dalton Dead Reckoning Model G, used by pilots to measure and evaluate their course given flight conditions to identify changes necessary to achieve objectives. It would be strapped to the pilot's leg in flight. It contains the notebook for recording key metrics during a mission. 1950's era. Its former owner was an RCAF F 86 Pilot. The top circular calculator can be flipped open for access to the navigation