Abstract: An improved gas analyzer for analyzing the concentrations and amounts of one or more different gases in drilling mud returning from a borehole is disclosed. An oil well drilling rig re-circulates the drilling mud by continuously pumping it through a gas separation means. The gas separation means generally includes a fluid stop, a bubble jar and a dririte chamber in order to separate the gases from the drilling mud. A gas sample from these separated gases can be mixed with a carrier gas and are conveyed to gas analyzing means where the concentration of the different hydrocarbon components of the gases in the mud can be continuously measured.

Abstract: An air-operated sound producing device includes a main housing including a downwardly curved reed-plate formed thereon with a plurality of variously sized sound channels formed therein, a reed assembly having at least two vibratable reeds formed thereon, and a means to secure the reed assembly over the downwardly curved reed-plate. The reed-plate provides a portion between the sound channels for center support and vibration of the reed. The reed assembly of the sound producing device is vibratable in whole, or in part, over multiple sound channels. The device is particularly suited for the use of thin, relatively wide reeds. Further, the device provides for the adaptation of a variety of interchangeable variously sized reeds produced from a single piece of material. The disclosed novel device can produce a wide variety of unusual and desirable sounds of considerable volume and has applications to hand-held musical instruments, toys, novelty items, and wildlife attraction devices.