Tachometer, Dual Engine, Electric, Type E-14, AN5530-2 Engines 1 & 2 Canberra see photos

see photos

WW2 vintage aircraft A-10A bubble sextant in its original wooden case with mounting hook and battery-power accessory for nighttime illumination used for celestial navigation

and a serial number prefix of AF57

combining Flight Director and Automatic Pilot systems used in civil aircraft such as the British ATL-98 Carvair (surplus Douglas DC-4's converted to carry passengers and vehicles) and Vickers Viscount

Tachometer, Dual Engine, Electric, Type E-14, AN5530-2 Engines 1 & 2 Canberra see photosHere is a WWII era dual engine electrical Tachometer measuring engine revs up to 4500 RPM. The Type E 14 AN5530 2, made by Friden part number 8DJ19 was used across multi engine US military aircraft during WWII, such as versions of fighters P 38 Lightning and P 61 Black Widow, medium bombers B 25 Mitchell and B 26 Marauder, and paired with one more dual tachometer for engines 3 & 4 in heavy bombers such as B 17 Flying Fortress, B 24 Liberator, and B 29