Omni-Bearing Selector 336A-2 for Collins Radio VOR-102 Nav System DC-7 C-119 still rotates the dial

still rotates the dial

and another full rotation to 4000 RPM

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

but could be removed)

the Directional Gyro

Omni-Bearing Selector 336A-2 for Collins Radio VOR-102 Nav System DC-7 C-119 still rotates the dialHere is an Omni Bearing Selector 336A 2 as used in the 1950's era Collins Radio Navigation System VOR 102. The selector enables selection of the desired track and provides to from information. The right hand knob selects the course, and the left hand switch reverses course 180 degrees. See photo of the instrument in the 1959 Collins Radio catalog page, and the front page of the Collins sales brochure. Measures 3. 25in diameter and ~6in deep. The VOR