Record table drives for sound reproduction machines

Claim 1

IN COMBINATION WITH A SOUND REPRODUCING MACHINE OF THE TYPE HAVING A HORIZONTALLY DISPOSED ROTATING RECORD TABLE ADAPTED TO SUPPORT A DISK RECORD AND HAVING A MOVABLE TONE ARM PROVIDED WITH A STYLUS TRAVERSING THE SOUND GROOVE OF THE RECORD; LAMINAE OF MAGNETIC AND NONMAGNETIC ELECTRICALLY CONDUCTIVE MATERIAL CONNECTED TO THE UNDERFACE OF THE RECORD TABLE, A SINGLE ELECTROMAGNETIC DRIVING MEANS POSITIONED BENEATH SAID LAMINAE TO IMPART ROTATIVE MOVEMENT TO THE RECORD TABLE WHEN ENERGIZED, AN EXTENSION ARM CONNECTED FOR LATERAL MOVEMENT WITH THE TONE ARM AND EXTENDING BENEATH THE RECORD TABLE AND HAVING A TERMINATING END, LOCKING MEANS CARRIED BY THE TERMINATING END OF THE EXTENSION ARM, CORRESPONDING LOCKING MEANS CONNECTED TO SAID ELECTROMAGNETIC DRIVING MEANS AND YIELDABLY CONNECTED TO SAID TERMINATING END TO COACT WITH SAID FIRST LOCKING MEANS TO LOCK SAID ELECTROMAGNETIC DRIVING MEANS IN SELECTIVE POSITION ON SAID EXTENDED ARM FOR CONSTANT POSITIONAL ADJUSTMENT THEREOF BENEATH THE RECORD TABLE BY THE TONE ARM AS THE STYLUS TRAVERSES THE RECORD SOUND GROOVE TO PROVIDE A FIXED SELECTED LINEAR SPEED TO THE RECORD''S SOUND GROOVE, AND SAID ELECTROMAGNETIC DRIVING MEANS BEING SELECTIVELY ROTATABLE ON SAID EXTENSION ARM THROUGH THE RESPECTIVE LOCKING MEANS ON A VERTICAL AXIS PASSING THROUGH THE POINT OF THE TONE ARM STYLUS AND THE CENTER OF SAID ELECTROMAGNETIC DRIVING MEANS FOR SELECTING A DESIRED SPEED FOR THE RECORD TABLE.