Compass, Direct Reading Magnetic, US Navy Mark X P-80 which indicates with the thin

which indicates with the thin inner pointer

The pendulum is geared to a pointer which revolves in a limited arc on a dial calibrated through the range from zero (level) to 30 degrees nose up or down

The SCR 269 system (see diagram)

published by the Technical Air Intelligence Center of the US Navy

compass card

Compass, Direct Reading Magnetic, US Navy Mark X P-80 which indicates with the thinThis WWII era Direct Reading Magnetic Compass Mark X, Kollsman 398 01 2702 was made for aircraft of the US Navy such as the seaplane JRF 5 Grumman Goose. The interesting aspect of the design of this compass is that the directional mechanism lies horizontally within the rear chamber, and displays the direction on a vertically mounted compass card. In addition, the desired course heading can be selected by rotating the knob at the bottom center of the