Abstract: A flame arrestor is disclosed which includes a conduit extending along inside of a drum arranged to contain a quantity of non-combustible liquid. This conduit is equipped with bubbler nozzles that discharge a combustible gas into the liquid in the form of separate, discrete bubbles. The gas is drawn from the drum through outlets above the liquid level and deflectors are positioned to deflect and distribute a flame front entering the drum through any of the nozzles.

Abstract: An apparatus for separating dead fish eggs from live fish eggs is designed to automatically interrogate the degree of opaqueness of each egg in a batch of fish eggs. A selector individually separates an individual fish egg from the batch and injects the separated egg into a fluid stream for delivery past an optical interrogator. Dead fish eggs which display a high degree of opaqueness are optically detected and are hydraulically separated from live eggs which show a low degree of opaqueness. The optical interrogator delivers a light from a light source conveyed through fiber optics to the fluid stream in which the eggs are injected. An electronic detector generates a first pulse for live fish eggs and a second pulse for dead fish eggs. The second type of pulse activates a hydraulic fluid switch which causes the dead fish eggs to be deposited in a separate receptacle by changing the flow direction of the fluid stream.