Abstract: An earth borehole instrument having a plurality of contact arms which are forced against the borehole side-walls so as to centralize the instrument in the hole. The contact arms may be either left free to rotate or may be positively locked in a number of non-rotational positions. This locking is done by fixedly engaging an indexing member, which is restricted to movement only in translation as to the instrument shaft, with the contact arms, thereby similarly restricting their movement.

Abstract: An elongated housing of a well logging instrument having a lever latch and positioning mechanism attached to a carriage and a snorkel and barrel assembly. One end of the sensing device is mounted on the carriage and the snorkel is affixed to the opposite end. The latch and positioning mechanism allows the assembly to be moved until the snorkel enters the barrel and retains it in place. The mechanism is then secured in place. The mechanism contains an indicator which is visible if the mechanism is not in position to be secured. Electrical signals are passed from the sensing device, through the snorkel to an electrical connector at the end of the barrel and through a cable to the earth's surface.

Abstract: An elongated body member, a portion of which forms a chamber for retaining samples of the liquid and steam contents of a geothermal well. A fluid tight seal is formed between an O-ring and a parallel sealing face of a slidable shaft member. The pressure sealing force is adjustably controlled by a spring assembly. The spring assembly is adjusted so that the sealing force must be overcome before a sample is taken. When the sealing force exerted upon the seal is overcome, the sample chamber is placed in fluid communication with the geothermal borehole by a series of passages which include grooves or slots contained in the slidable shaft member. After sampling is complete the seal is reformed allowing the sampler to be retrieved to a surface location.