(g) A gyroscopic direction indicator (directional gyro or equivalent).

(g) a heading indicator (directional gyroscope); and

He then helped develop the artificial horizon and the directional gyrocope.

Heading indicator: also known as Directional Gyro, indicates direction in relation with magnetic North when setting with a compass

For the time, it was well equipped with full IFR equipment: two VOR-ILS sets, one ADF set, two VHF radios, an attitude indicator and a directional gyroscope.