Permanent magnet rotor type electric meter

Claim 1

IN AN ELECTRICAL MEASURING INSTRUMENT, A CASING HAVING A HOLLOW CUP-LIKE INTEGRALLY FORMED REAR COMPONENT OF DIELECTRIC PLASTIC HAVING A REARWARDLY EXTENDING UNDERCUT SLOT IN THE BOTTOM OF ITS HOLLOW, AND A TRANSPARENT COVER COMPONENT: A PREASSEMBLED INSERT COMPRISING A U-SHAPED BRACKET OF WHICH THE CROSSBAR IS SLIDABLE LONGITUDINALLY INTO THE UNDERCUT SLOT IN THE REAR COMPONENT OF THE CASING, A HOLLOW BLOCK OF DIELECTRIC MATERIAL SECURED TO THE BRACKET CROSSWISE IN THE INTERVAL BETWEEN THE UPSTANDING LEGS OF THE LATTER, A HORIZONTALLY ARRANGED VERTICAL AXIS COIL WOUND ABOUT SAID BLOCK, AN ARBOR WITH A POINTER THEREON, FOR COORDINATION WITH GRADUATIONS ON A DIAL WITHIN THE CASING, SAID ARBOR HAVING ITS OPPOSITE ENDS ROTATIVELY SUPPORTED IN THE UPSTANDING LEGS OF THE U-SHAPED BRACKET AT RIGHT ANGLES TO THE COIL AXIS, A PERMANENTLY MAGNETIZED DISK AFFIXED TO THE ARBOR AND EXTENDING INTO THE HOLLOW OF SAID BLOCK, AND A HEADED SCREW OF WHICH THE SHANK IS PASSED THROUGH THE REAR COMPONENT OF THE CASING AND THREADEDLY ENGAGES INTO THE DIELECTRIC BLOCK TO SECURE THE UNIT IN PLACE.