Abstract: A compact and symmetrically arranged construction for electrical current indicating meters of small size. The novel construction for a meter comprises combinations of magnet components including the matching of a permanent magnet with a flux conducting non-permanent magnetic body.

Abstract: A compact and symmetrically arranged construction for electrical current indicating meters of small size. The novel construction for a meter comprises a unitary frame member combined with concentrically arranged components.

Abstract: The present invention relates to an electrical measuring instrument of the D'Arsonval type and more specifically to an improved low cost and small suspension system for the bobbin or armature assembly of such an instrument. Such improved suspension system includes the combination of a small light weight bobbin having thin gauge, surface insulated conductor wound on a light weight bobbin frame. Thin conducting strips are mounted to the frame above and below and these thin plates are provided with pins extending above and below respectively into jeweled pin pockets. Each pin is inserted at its blunt end through a strip in which it later resides by incorporating the pin in a punch, mounting the strip over an opening in a die beneath the punch and aligning the blunt end of the pin with the opening in the die.

Abstract: A pair of relatively movable, shrouded jaws are provided for a hook-on type measuring instrument to insulate the conductive ends of the jaws from contact with high voltage electrical conductors on which the instrument is periodically clamped during its normal application. The shrouded ends of the jaws are characterized by incorporating cup-shaped insulated recesses within which the uninsulated ends of the soft iron magnetic ends of the jaws are disposed substantially below the outwardly extending lips of the recesses thereby to prevent the iron from being inadvertently placed in contact with a high voltage conductor when the jaws are opened to either place them around such a conductor or to remove them therefrom.

Abstract: A probe assembly for use with an electrical voltmeter-ammeter, to adapt the meter to read electrical resistance, is provided with a pair of probe electrodes connected respectively to separate, flexible, insulated electrical conductors that are coupled to a common multi-terminal plug housing. Terminals mounted in the plug housing are arranged to cooperate with a plurality of terminals mounted on a terminal board in a meter. The probe assembly is further characterized by incorporating a fuse and a battery electrically connected in series with one of the probe electrodes and the terminal to which it is connected by a flexible conductor. A potentiometer is connected in series with one of the flexible conductors while a resistor connected between the flexible conductors to enable a meter to be adjusted for full scale deflection when it is connected to the probe assembly while the probe electrodes are in engagement with one another.