Abstract: This abstract describes vibrator systems for generating elastic waves in the earth, in which an actuator has a mechanical output drive means responsive to an electrical oscillatory signal, the drive means operates a variable volume compartiment filled with fluid, which is connected by conduit to a least one vibrator, comprising an expandable closed chamber connected between a base plate and a reaction mass. Two or more compartments can be used with two or more actuator drive means, the compartments connected separately to a plurality of vibrators. The vibrators may operate in-phase on in phase opposition. The plurality of vibrators may operate in horizontal and/or vertical arrays.

Abstract: A method and apparatus for converting a single function, i.e., hydrocarbon detection, well logging tool to a dual function tool, i.e., the detection of naturally occurring gamma rays, by making the amplitude reference pulses necessary for single function operation related in rate to the second function. A minimum constant rate of amplitude reference pulses are provided to ensure the operability of the single function tool in the absence of the second function and an adjustment is thereafter made to remove the effects of this minimum rate of reference pulses.

Abstract: 1. In a key pulse generating circuit for producing key pulses varying in amplitude in highly irregular manner, said pulses occurring at a given rate, means to generate high speed off-on pulses at a rate many times higher than said given rate in a plurality of separate paths, means to hold over certain of said off-on pulses into subsequent of said high speed pulse times, means to combine the pulses so held over with pulses subsequently generated in certain of said paths to form combination of said high speed pulses, and means to select and combine with one another to form one of the final key pulses occurring at said given rate, individual ones of said last-mentioned high speed pulses occurring at instants of time separated from one another by several of said high speed pulses while discarding the intervening high speed pulses.6.

Abstract: This invention relates to seismic transducer assemblies for converting compressional wave motion or acoustic energy into electric energy in a fluid medium such as is encountered in marshy terrains. It also relates to an improved method of manufacturing such transducers. The transducer includes a rigid hollow casing having a conical end cap to facilitate planting the casing into the ground. At least one pressure transducer element is mounted in the casing. A water-impervious, pressure-transmitting, insulating core fills the casing's cavity. The material rigidly holds the transducer in place and allows transfer of pressure energy from the fluid medium in which the transducer assembly is submerged, to the inner surfaces of the transducer element.

Abstract: An apparatus to control the depth in the water of a cable, such as a cable streamer of seismic geophones or hydrophones towed behind an exploration boat during seismic surveys of submerged formations, and maintain the cable at a desired depth while operating at reduced noise levels and with improved operating characteristics. The depth at which the cable is maintained may be adjusted for a range of selected depths.