Abstract: A seismic data gathering system includes a seismic cable having a plurality of cable sections, each including a seismic detector and a pair of signal lines for carrying the seismic energy signals produced by the detector in response to seismic energy waves. A shunting resistance is located in each cable section with one end connected to one of the pair of signal lines and the other end connected through a mating connector to the other of the pair of signal lines in the next succeeding cable section so that a shunting resistance is added to the seismic cable each time a detector is added to the seismic cable. In this manner the electrical damping of each seismic detector remains constant when the seismic cable is coupled to a data acquisition unit regardless of the number of detectors included within the seismic cable.

Abstract: An electronic circuit which operates as a phase shifter is disclosed which uses a phase inversion principle. The circuit is broadband and may be either manually or electronically operated.

Abstract: A chromatograph signal generator employs a plurality of Gaussian-waveform generators and a ramp voltage generator. A summing amplifier combines the outputs of such generators to produce a composite chromatographic output.