Combination compass

Details Combination compass Combination compass

G - Physics

01

C

G01C 17/00 (2006.01) G01C 17/02 (2006.01) G10K 5/00 (2006.01)

Patent

CA 2402164

A combination compass is constructed to include a housing, a compass device mounted inside the housing, a top cover pivoted to one end of the housing and being capable of covering over the compass device. The top cover has a mouthpiece, a resonance chamber, an air passage connected between the mouthpiece and the resonance chamber, and a sound producing device disposed in the air passage and adapted to produce sound when the user blowing air into the mouthpiece with the mouth.

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