Altimeter, Sensitive, Type C-11, 35,000 ft, PN 642K-05-784 French Armée de l'Air and the smallest pointer travels

and the smallest pointer travels along an inner dial

air speed is indicated along the inner scale up to 450 Knots

We have seen claims that these were used in aircraft such as the Sopwith Camel and Sopwith Pup

which was to be set for the maximum permissible speed in a dive for the aircraft type in which it was installed

see attached tag

Altimeter, Sensitive, Type C-11, 35,000 ft, PN 642K-05-784 French Armée de l'Air and the smallest pointer travelsHere is a post WWII era Sensitive Altimeter, similar to the US Army Type C 11, made by Kollsman. The C 11 Sensitive Altimeter displayed altitude using 3 pointers. The knob is used to adjust the altimeter to the barometric pressure is displayed in the small window at the 3 o'clock position. See spec sheet in the photo gallery. It is in very good condition given its age. The glass and case are intact, and the knob rotates, and the pointers move. It is