Magnetic visual indicating device

Claim 1

AN ELECTROMAGNETIC INDICATING DEVICE COMPRISING AN ELECTROMAGNETIC SYSTEM HAVING YOKE AND CONDUCTOR MEANS ASSOCIATED THEREWITH, SAID YOKE MEANS HAVING FIRST AND SECOND POLE MEMBERS DISPOSED SUBSTANTIALLY AT RIGHT ANGLES TO EACH OTHER AND SAID CONDUCTOR MEANS PROVIDING AT SAID FIRST AND SECOND POLE MEMBERS FIRST AND SECOND MAGNETIC POLES OF OPPOSITE POLARITY, RESPECTIVELY, FOR THE ESTABLISHMENT THEREBETWEEN OF A MAGNETIC FIELD HAVING A DIRECTION RESPONSIVE TO THE RELATIVE ELECTRIC POLARITY OF A PREDETERMINED ELECTRIC SIGNAL APPLIED TO SAID CONDUCTOR MEANS, A SUBSTANTIALLY CYLINDRICAL SHAPED ROTATABLE MEMBER OF PERMANENT MAGNETIC MATERIAL HAVING A PREDETERMINED PERMANENT NORTH AND SOUTH POLE CHARACTERISTIC SUBSTANTIALLY TRANSVERSE TO THE LONGITUDINAL AXIS THEREOF, SAID ROTATABLE MEMBER BEING ROTATABLE ABOUT SAID LONGITUDINAL AXIS IN RESPONSE TO THE RELATIVE DIRECTION OF SAID MAGNETIC FIELD, SAID LONGITUDINAL AXIS HAVING ITS CENTER LOCATED BETWEEN SAID POLE MEMBERS, AND MEANS TO ARREST THE ROTATION OF SAID ROTATABLE MEMBER AT FIRST AND SECOND INDICATING POSITIONS FOR PREDETERMINED AND OPPOSITE TYPES, RESPECTIVELY, OF SAID SIGNAL POLARITY, SAID MEANS TO ARREST COMPRISING A NONMAGNETIC MEMBER CONNECTIVELY DISPOSED ABOUT SAID ROTATABLE MEMBER, SAID NON-MAGNETIC MEMBER ENGAGING SAID YOKE MEANS AT SAID FIRST AND SECOND POLE MEMBERS THEREOF IN SAID FIRST AND SECOND POSITIONS, RESPECTIVELY.