Abstract: Embodiments of a multi-axial antenna system and system for measuring subsurface formations are generally described herein. Other embodiments may be described and claimed. In some embodiments, the multi-axial antenna system comprising at least two co-located coils wound around a torroidal-shaped bobbin. Each coil generates a magnetic field in a mutually orthogonal direction. Signals provided to the coils may be adjusted to simulate a tilted-coil antenna system.

Abstract: A group III nitride semiconductor substrate production method includes preparing a bulk crystal formed of a group III nitride semiconductor single crystal. The group III nitride semiconductor single crystal has one crystalline plane and an other crystalline plane. Hardness of the other crystalline plane is smaller than hardness of the one crystalline plane. The prepared bulk crystal is cut from the other crystalline plane to the one crystalline plane of the bulk crystal.

Abstract: The present invention provides a variable resistance device having at least one pair of channels retaining a conductive ball between them. The channels contain a resistive element and a conductive element and movement of the conductive ball within the channels, caused by rotation of the channels relative to each other, provides a variable resistance.

Abstract: A multi-rotation type potentiometer having an additional stopper member rotatable so as to set a rotation angle of the potentiometer or its sliding member to any angle.

Abstract: A housing for use with a variable resistor consisting of a spiral resistance element, a rotary shaft, a conductive slide plate and a top is disclosed. The housing includes a cylindrical body for supporting on its inner surface the resistance element, a first cylindrical panel engaged with one open end of the cylindrical body to close the open end and rotatably supporting the rotary shaft, a second cylindrical panel engaged with the other open end of the cylindrical body and rotatably supporting the rotary shaft, at least one pair of resilient engaging projections extended from at least one of the first and second cylindrical panels along the axis of the cylindrical body, and engaging recesses formed on an outer periphery of the cylindrical body at predetermined positions and respectively engaging with the resilient engaging projections when the first and second cylindrical panels are engaged with the cylindrical body to make up the housing for the variable resistor.

Abstract: A resistance element comprises an insulating cylinder having a helical thread groove on the outer surface thereof. A resistive channel is supported by the groove and a multi-strand wiper is guided by a follower which rides in the root of the channel. The resistance material on the sides of the groove may be notched for purposes of calibration.

Abstract: A potentiometer contained within a housing is operated from the outside by means of an operating member which extends inward through an orifice in a housing wall. The operating member engages the potentiometer drive stem with the aid of an O-ring slip clutch, and includes a flange which is spring-urged against the interior housing wall to inhibit internal explosions from propagating to the outside.

Abstract: The Audio Signal Distributor (abbreviated ASD) is a device which takes the current from the amplifier output and distributes it in varying ratios to a plurality of speakers.The nature of the invention is a modified rheostat which divides the output current into separate currents of varying ratio. When a plurality of speakers are excited by these currents the illusion of sound movement from speaker to speaker is created maintaining a constant loudness level.

Abstract: A variable resistor including a resistance element, a housing supporting the element, and rotary means including a shaft located within the housing. Means are provided to restrain rotational movement of the rotary means except upon application of a relatively large magnitude predetermined force. The restraining means includes a resilient member and a second member operable to develop a frictional force to prevent undesired rotation of the rotary means.