Navigadget Mark I Flight Computer Battle Power venturi tubes provide a

Power venturi tubes provide a source of vacuum for the operation of air-driven instruments such as directional gyros

Type IN-4D

Restoration inquiries are welcome

illuminated sighting device used on torpedo-carrying airplanes

Navigadget Mark I Flight Computer Battle Power venturi tubes provide aThis highly unusual Navigadget Mark I Flight Computer is the first and only one of its kind that we've run across. Measuring 10 x 5. 25 inches and painted on aluminum, this device seem intended to be placed on a chart with a scale of 1. 25 inches = 10 miles, with the left "Miles" scale placed along the intended flight path. The center axis intersecting at the 40 Mile mark is the calculated ground speed, from 60 to 150 MPH. The aluminum semi circle