ClipArt ETC
Ritchie Liquid Compass. US Naval compasses have the degree around the rim marked from 0 to 360, east being 90, south being 180, etc.

Compass Card

Ritchie Liquid Compass. US Naval compasses have the degree around the rim marked from 0 to 360, east…

An illustration of a liquid compass. "A, Bowl, partly in section; B, Expansion chamber; D, The glass; G, Gimbal ring; L, Nut to expand chamber when filling bowl; M, Screw connector; N, Hole for filling; O, Magnetic needle; P, Buoyant chamber; Q, Iridium pivot; R, Sapphire cap; S, Mica card." -Britannica, 1910

Liquid Compass

An illustration of a liquid compass. "A, Bowl, partly in section; B, Expansion chamber; D, The glass;…