Altimeter, Mk XVIIA, Ref 6A/1538 0-35,000ft, British Royal Air Force C-121 and protects the lens from

and protects the lens from dirt and oil

This is a Magnesyn-type Manifold Pressure Indicator for a dual engine aircraft

The clock is wound by turning this red knob counterclockwise from its home position

"triggering" the Eureka (AN/PPN-1) and causing it to return a pulse

For dual-control installations

Altimeter, Mk XVIIA, Ref 6A/1538 0-35,000ft, British Royal Air Force C-121 and protects the lens fromHere is a British Altimeter Mk XVIIA, Rf 6a 1538 as used in WW2 RAF bombers such as the Avro Lancaster, showing a maximum altitude of 35,000 ft. The altimeter has the marking of ICAN, the International Commission for Air Navigation. ICAN was an international governing body established on the basis of the ICAO relating to the regulation of aerial navigation and dealt exclusively with the regulation of international air navigation and in particular