Magnetic compass

• US 3,300,867 A
• Filed: 03/23/1964
• Issued: 01/31/1967
• Est. Priority Date: 03/23/1964
• Status: Expired due to Term

• Current Assignee: Sampson, Edward J.
• Original Assignee: Sampson, Edward J.
• Inventors: Sampson, Edward J.
• Application Number:
  US04/353,802
• Time in Patent Office: 1,044 Days
• US Class Current: 33/348
• CPC Class Codes: G01C 17/00 Compasses; Devices for ascertaining true or magnetic north for navigation or surveying purposes using gyroscopic effect G01C19/00

Claims

1. IN A MAGNETIC COMPASS FOR USE WITH A VEHICLE, THE COMBINATION COMPRISING A HOUSING HAVING A TRANSPARENT BOTTOM, A COMPASS CARD SUPPORTED WITHIN SAID HOUSING FOR MOVEMENT ABOUT A VERTICAL AXIS AND INCLUDING A DOWNWARDLY DIRECTED ANNULAR FACE HAVING A CENTRAL OPENING AND HAVING REFERENCE MARKINGS ARRANGED IN AN ANNULAR SERIES ABOUT SAID VERTICAL AXIS, SAID REFERENCE MARKING BEING LOCATED AT THE RADIALLY INNER MARGIN OF SAID CARD FACE, A REFERENCE ELEMENT FIXED RELATIVE TO SAID HOUSING AND LOCATED WITHIN SAID CENTRAL OPENING OF SAID CARD FACE, SAID REFERENCE ELEMENT HAVING AT LEAST ONE REFERENCE MARK THEREON FOR COOPERATION WITH SAID REFERENCE MARKINGS OF SAID COMPASS CARD, AND A MIRROR POSITIONED BELOW SAID TRANSPARENT BOTTOM AND AT AN INCLINED ANGLE TO SAID VERTICAL AXIS FOR REFLECTING AN IMAGE OF SAID DOWNWARDLY DIRECTED FACE OF SAID COMPASS CARD, SAID MIRROR BEING OF SUFFICIENT SIZE TO REFLECT AN IMAGE OF THE COMPLETE ANNULAR SERIES OF SAID REFERENCE MARKINGS AND OF SAID REFERENCE ELEMENT.