Abstract: A pressure sensor apparatus primarily for sensing pressure in a body cavity such as the cranium, bladder or vena cava of an animal or human comprising a housing having a bellows defining a chamber within the housing. Means is provided for communicating pressure from the body cavity to the chamber. A radioactive material is housed in the housing and at least partially surrounded by radiation shielding. The radiation shielding shields the radioactive material as a function of the pressure sensed by the flexible member and the radioactivity is sensed by a radiation detector.

Abstract: A differential controller for a jackshaft or a positioning combustion system having an input shaft coupled to a fuel valve and an output shaft coupled to an air damper. The controller includes means for sensing a transmitted signal indicative of the level of oxygen in the products of combustion and in response thereto differentially adjusts the vernier position of the output shaft relative to the input shaft to provide optimum fuel use under all operating conditions. The controller includes means for precluding differential travel between the shafts at low fire (load) positions. As load demand increases the controller enables differential travel to occur with increasing demand, with the amount of differential travel permitted being a function of increasing load. The maximum range of differential travel is adjustably predetermined.

Abstract: A pressure sensor apparatus primarily for sensing pressure in a body cavity such as the cranium, bladder or vena cava of an animal or human comprising a housing having a bellows defining a chamber within the housing. Means is provided for communicating pressure from the body cavity to the chamber. A radioactive material is housed in the housing and at least partially surrounded by radiation shielding. The radiation shielding shields the radioactive material as a function of the pressure sensed by the flexible member and the radioactivity is sensed by a radiation detector.

Abstract: A combination tool comprises first and second handles movably pivoted together at a pivot axis, with respective first and second shanks extending from the pivot axis and joined to the corresponding handle. A tool member is joined substantially normal to each shank, and substantially parallel with the pivot axis, each tool member having a flat end surface substantially parallel with the corresponding shank. The upper surface of the tool members have opposing indentations therein, serving as a recess for receiving wire for stripping purposes. When the opposing surfaces of the tool members abut one another, the end surfaces of the tool member define a flat hammer face.