Cabin Pressurization Rate of Change Selector B-50 KC-97
This offer is for a vintage 1950s Cabin Pressurization Rate of Change Selector made by Airesearch, which appeared on the engineers panels of the US Air Force Boeing B-50 Bomber and KC-97 Stratotanker. It has two overhaul date stamps, 1969 and 1972. See photos of the diagram and descriptive text from the B-50 Flight Manual. Both measure 3.25in diameter and ~6in deep.
The dial markings are clear and the glass and case are intact. It is in exceptional condition for its age. The center knob adjusts the rate of change pointer. See photos.