USAAF Type C-2 Computer

By G Felsenthal & Sons, Chicago.  Computer, Altitude Correction Type C-2.  20cm diameter white plastic disc type computer for calculating altitude according to the atmospheric pressure. Essentially this is the same as the later AN-5837.  That having luminous marking for use in the dark.  This example is in very good used condition and has a 1942 order code.  Stock code M20165.