Abstract: An acoustic-wave sensor apparatus and method. The apparatus for analyzing a normally liquid petroleum-based composition includes at least one acoustic-wave device in contact with the petroleum-based composition for sensing or detecting the presence of constituents (e.g. paraffins or petroleum waxes) therein which solidify upon cooling of the petroleum-based composition below a cloud-point temperature. The acoustic-wave device can be a thickness-shear-mode device (also termed a quartz crystal mircrobalance), a surface-acoustic-wave device, an acoustic-plate-mode device or a flexural plate-wave device. Embodiments of the present invention can be used for measuring a cloud point, a pour point and/or a freeze point of the petroleum-based composition, and for determining a temperature characteristic of each point.

Abstract: A governor for a steam operated engine by which the steam valve opening for any selected engine speed can be varied to accommodate different steam pressures, or conversely with a constant steam pressure, the steam valve opening may be varied to produce any selected engine speed.

Abstract: A governor for a steam operated engine by which the steam valve opening for any selected engine speed can be varied to accommodate different steam pressures, or conversely with a constant steam pressure, the steam value opening may be varied to produce any selected engine speed.