Abstract: An earth boring drill bit design for alleviating balling varies the junk slot depth in junk slots subject to balling from the other junk slots. Using variable depth bit bodies enhances the hydraulic characteristics of the bit as well as assists in the placement of the nozzles for machining purposes. This flexibility optimizes the area changes along the ducts required by the bit's operation.

Abstract: An earth boring drill bit design for alleviating balling varies the junk slot depth in junk slots subject to balling from the other junk slots. Using variable depth bit bodies enhances the hydraulic characteristics of the bit as well as assists in the placement of the nozzles for machining purposes. This flexibility optimizes the area changes along the ducts required by the bit's operation.

Abstract: A method and apparatus for generating test data is presented. A data generator produces data using element specifications contained in an input script. The data generator includes a specification analyzer and data synthesizer. The data generator produces the data that includes varied combinations of the element specification generated in a particular order. Both the combination and the particular order in the generated sequence may vary in accordance with a specified method of data generation. Three methods of data generation--carry-out method, grey code method, and all-change method--are described.

Abstract: A method and apparatus for generating test data is presented. A data generator produces data using element specifications contained in an input script. The data generator includes a specification analyzer and data synthesizer. The data generator produces the data that includes varied combinations of the element specification generated in a particular order. Both the combination and the particular order in the generated sequence may vary in accordance with a specified method of data generation. Three methods of data generation--carry-out method, grey code method, and all-change method--are described.

Abstract: A rotary fluid machine comprising a housing, a drive disk, a drive shaft, inner and outer cylindrical assemblies, and a plurality of vanes. The drive disk is supported within the housing for rotation about a first axis, and the drive shaft is connected to the drive disk to rotate that disk about the first axis. The inner and outer cylindrical assemblies extend within the housing, and the housing, the drive disk, and the inner and outer cylindrical assemblies form a working chamber that extends around, eccentric to, that first axis. The vanes are connected to the drive disc and are located in the working chamber to compress or to drive a fluid therein.

Abstract: A phonograph record player including a speaker, a turntable and resettable tone arm. The speaker is fixedly secured to the casing of the record player and the tone arm is in contact with the speaker and the record as the record is being played. The turntable is mounted on a spindle carried by a transversely extending cantilever arm which is either attached to the base of the casing of the record player or is an integral part of the said casing. The cantilever arm arrangement enables the turntable to move resiliently in all directions being only restricted by the needle point thus providing a relatively stiff coupling arrangement between the record, the turntable and the speaker. The tone arm, which is radially spring biased, is maintained against the action of the spring in the grooves of the record throughout play of the record and by the central portion of the record when play is completed. The record is normally urged into contact with the tone arm by the pressure of the cantilever arm.

Abstract: Apparatus to control the direction of movement of a mechanism over a surface. The surface is provided with a plurality of substantially parallel strips of conductive material alternately connected to opposite terminals of a source of current supply. The mechanism has a plurality of conductive discs or wipers so disposed that at least two of the wipers contact a pair of the conductors which are each connected to oppositely disposed terminals. The mechanism also has driving means such as wheels for movement and a motor engaged through the wipers for propelling the wheels over the surface. The mechanism can move forwardly, rearwardly, laterally or in a zig-zag motion. Control means are provided between the motor and the driving means so that the direction of movement may be varied in response to the voltage across the alternate conductors engaged by the wipers.