Abstract: Quartz resonator pressure transducers for use in subterranean boreholes include a quartz pressure sensor and an electronic temperature sensor. Temperature sensors include a constant current generator, a proportional to absolute temperature (PTAT) current generator, and a relaxation oscillator. Pressure transducers may include such a temperature sensor. Methods of monitoring pressure in a subterranean borehole may include monitoring a frequency output of a quartz pressure sensor and monitoring a frequency output of an electronic temperature sensor.

Abstract: A passive climbing protection device can be comprised of multiple components that are confined to a single stem which nest to create chocks of differing sizes. The multiple components are sized to enable each smaller component to be nested within the next largest component. Different sized chocks can be formed by simply sliding one or more larger components away from one or more smaller components leaving the smaller components to form a chock of the desired size. Accordingly, the passive climbing protection device provides multiple differently sized chocks on a single stem to enable a large range of placements to be covered with a single device.