Accelerometer, G-Meter, AN-5745L3, F4U-5N Corsair FJ-2 The B-20 Compass design is

The B-20 Compass design is unique in that it contains a magnetic horizontal float suspended in damping fluid that engages the directional pointer on a vertical compass card to display direction

Here is an article from Flight Magazine Sept 1943 describing the Astrograph

Here is a WWII-era aircraft Pitot Tube Fl 22287 crash relic

early 1900's Berling Magneto Switch

The manual is ~2 inches thick and is in reasonable condition given its age

Accelerometer, G-Meter, AN-5745L3, F4U-5N Corsair FJ-2 The B-20 Compass design isHere is a fine example of a post WWII era Accelerometer, made by Kollsman, part number 1470 8 02 (FSS# R88 A 140 15) as made for the US Navy's fighter aircraft F4U 5N (and 5P and 5NL) Corsair, as documented in the aircraft's parts list dated 1951. According to the USN ASO Catalog 8801 dated June 1953, it was also used across other USN aircraft such as the TBM Avenger, F9F Cougar Panther, and AD 4 Skyraider. The accelerometer has 3 pointers: a main