Abstract: A selectively configurable penetrometer device for impact testing the physical characteristics of the sea floor includes a hollow cylindrical housing which is formed with a recess. A hemispherical nose is engageable with one end of the housing and a removable fin assembly is selectively engageable with the opposite end of the housing. A transponder is engageable in a fluid tight seal with the end of the housing opposite the hemispherical nose to hold the electronic components in the recess of the housing. In the operation of the penetrometer, the transmitter emits a signal of precisely controlled constant frequency, and a remote receiver detects variations in signal receptions during impact of the penetrometer with the sea floor to determine the physical characteristics of the surface of the sea floor. The device can also include weighted spacers which can be selectively inserted into the device between the housing and the hemispherical nose.

Abstract: A laser-energizable thermal probe apparatus useful for laser angioplasty procedures comprises a heat generating probe assembly connected to the distal end of an optical fiber, the proximal end of the fiber being connected to a source of laser energy. A thermocouple mounts on the probe assembly and is connected to control the temperature of the probe assembly in use.

Abstract: A graphic recording system for use with a multiple channel underwater sonar system. The recording system includes a plurality of memories, each for storing information received over a different channel of the sonar system. One or more channels may carry side scan sonar information, while another may carry sub-bottom sonar information, etc. The information from the channels is received and stored in the memories simultaneously. The recording system further includes a graphic line recorder which is responsive to the receipt of a sequence of signals for producing on chart paper a line trace representation of the signals. A control unit controls the storage of information in and retrieval of information from the memories and application of the information to the graphic line recorder in such a manner that the information may be applied to the recorder in various sequences and at various rates.