Madison Bay Co. Explorers’ Compass, 3"Description Functioning compass makes a great home decor piece and addition to an office, den or library. Unlike most modern compasses, a Brunton style compass utilizes magnetic induction damping rather than fluid to damp needle oscillation. Elegant, working antique reproduction, but not meant for scientific use. 3" x 2 3 4" x 1 1 4" Sturdy, yet elegant solid polished brass housing Natural sine reference chart mounted to outside of housing Magnetic