Bombs, Fuses, and Racks Study Guide USAF Bombardment School, Mather AFB, 1951 C-43 the ring is turned until

the ring is turned until the two white wires are parallel to the North-South lines on the card

navigation instrument

glass and dial are in exceptional condition for the age of this indicator

and as used in aircraft-carrier-based Grumman Cougar F9F-5 and North American Fury FJ2 Jet Fighters

The small screw to the right of the face labeled "A" is to adjust for error

Bombs, Fuses, and Racks Study Guide USAF Bombardment School, Mather AFB, 1951 C-43 the ring is turned untilThis is an original Student Study Guide from the USAF Bombardment School at Mather Air Force Base, California, dated January 1951. The guide primarily addresses the bombing equipment used in the USAF's B 25 Mitchell Medium Bomber. Seems to be about 50 un numbered pages in length. It is in reasonable condition given its age.