Abstract: A simulated solid fuel effect gas fire comprising two elongate simulated solid fuel elements in the form of logs, with a partially aerated gas burner arranged in front of and below each log with respect to the front of the fire. Thus, in use, the flames from the burners engage a lower front portion of the logs, the flames then passing around the front of the logs. By this arrangement the lower front regions of the logs are heated to glow as radiants and the flames subsequently lick around the front of the logs as yellow flames, in accord with the visual effect of a real fire, complete combustion having been attained in the ambient atmosphere in front of the logs to thus form the yellow flames. By the provision of nodules by virtue of a bark pattern on the upper front portion of the logs, the flames heat the nodules to red heat and enhance both the radiant heat derived from the fire and the visual effect of the fire.

Abstract: The present specification relates to a ceramic plaque burner and to its method of construction. The plaque burner is formed as a generally planar plate with a number of parallel, narrow slit burner apertures extending therethrough. The present invention provides a ceramic plaque burner comprising a number of elongate ceramic members which are arranged parallel to each other with spacers located therebetween, a bezel engaging around the elongate ceramic members and said spacers to hold the assembly together. This construction is relatively simple and inexpensive to manufacture and avoids the problem of thermal stress cracking at the end regions of the burner slits.

Abstract: A gas fire appliance having a casing with a rear face at which a plurality of alumina flame effect burner tubes are supported, the tubes extending through a ceramic deflector plate supported over the rear face and lying behind a solid fuel simulating element which is relatively steeply raked to be visible through an adjacent front glass panel of the appliance. A dual-section main heater burner with a pair of metallic flame effect burners secured to one side thereof is positioned below the solid fuel simulating element, the flames therefrom being deflected upwardly by the plate. A gas control knob is operable to turn on all the burners or to select various ones thereof only as required. The steep rake of the fuel bed ensures that the visual appearance of the appliance is enhanced by fully presenting the working area and the alumina burner tubes positioned in the high temperature fuel bed ensure an effective living flame effect of high efficiency.

Abstract: A trigger device for a heat pack comprises three helically-coiled, resilient metallic filaments (1,2,3) nested one within the other and of inwardly decreasing diameter, the filament (2) being wound in a sense opposite to that of filaments (1) and (3). Flexing the assembly of nested helices about its longitudinal axes produces a rubbing action action between adjacent turns thereof which initiates crystallization. Other devices comprises two nested helices wound in the same sense; a single helix having a pressure plate at one end and an external or internal cap at the other; and a body of randomly convoluted or woven metallic filament.

Abstract: A sonic well logging system and apparatus for determination of seismic wave velocities from a seismic wave propagating in a subterranean formation about a wellbore. The system includes the process of imparting a seismic wave into the subterranean formation about the wellbore, and receiving the seismic wave after it has interacted with the subterranean formation at a plurality of semismic receivers positioned in the wellbore. The seismic waves are transformed at each of the seismic receivers into a seismic signal and these signals nonlinearly staked for a selected position in the wellbore to generate a velocity spectrum of seismic wave velocities. Coherency peaks are then selected from the velocity spectrum with each coherency peak having associated therewith a unique seismic wave velocity, such as P-wave, S-wave, tube wave and the like.

Abstract: A borehole logging method and system are provided for obtaining a measure of formation anisotropy in formations adjacent the borehole. The system comprises an elongated housing for suspension within the borehole. First and second asymmetric pressure wave sources for generating shear waves directly within formations adjacent the borehole are mounted with the housing. Additionally, first and second sets of receivers are mounted with the housing for recording first and second signals representative of the earth's response to the first and second shear waves propagating in the formations adjacent the borehole, respectively. The first set of receivers have an orientation matching the first source, and the second set of receivers have an orientation matching the second source. The system further includes a processor for determining a measure of formation anisotropy from the first and second recorded signals.

Abstract: A mechanical seal testing mechanism having a rotary shaft assembly about which a series of seal assemblies are arranged for simulated testing. The eccentricity of the shaft assembly may be varied while the tester is operating by a fluidically responsive control mechanism such that varying simulated conditions may be imparted to the seal assemblies being tested.

Abstract: A sonic well logging system and apparatus for determination of seismic wave velocities from a seismic wave propagating in a subterranean formation about a wellbore. The system includes the process of imparting a seismic wave into the subterranean formation about the wellbore, and receiving the seismic wave after it has interacted with the subterranean formation at a plurality of seismic receivers positioned in the wellbore. The seismic waves are transformed at each of the seismic receivers into a seismic signal and these signals nonlinearly stacked for a selected position in the wellbore to generate a velocity spectrum of seismic wave velocities. Coherency peaks are then selected from the velocity spectrum with each coherency peak having associated therewith a unique seismic wave velocity, such as P-wave, S-wave, tube wave and the like.