Rater of Climb / Vertical Speed Indicator, Pre-WWII WW1 25 inches diameter and ~2

25 inches diameter and ~2 inches deep

this was used in the reconnaissance aircraft Fieseler Storch Fi 156

The US Army Air Corps fighter P-39 Airacobra is an example of an aircraft which used this venturi

fuhrertocterkompass

It is new old stock

Rater of Climb / Vertical Speed Indicator, Pre-WWII WW1 25 inches diameter and ~2This is an early Pre WWII era Rate of Climb Vertical Speed Indicator, measuring climb or descent up to 2,000 ft per minute. Made by Pioneer, part number 321 1177. At 2. 75 inches diameter, the face is smaller than WWII era indicators. It is ~3. 5 inches deep. The glass is clear and the markings are superb.