Word: stopcock
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...Booth's apparatus and methods were intricate. He had to devise a special stopcock-sealing grease that boron trifluoride would not attack, a system of magnetically controlled rods for stirring his mixtures in closed vessels. Every time he generated the trifluoride he washed the maze of tubes, flasks and stills 20 times with air which had been freed of carbon dioxide. Argon 99.9+% was repeatedly distilled for further purification and the boron trifluoride was cleaned until it showed pure in the spectroscope...
...with a sure touch?the chorus girl turned by marriage into a lumpy termagant; the stern old grandmother who indulges a reprobate son. But, often as not, her dramatic moments flare into melodramatic anticlimax: Missie, weary of a wasted life, staggers to her old home, turns on the gas stopcock, falls asleep. "As the sun rose it turned into burnished copper the tarnished gas bracket, through which no gas had flowed for many years, and beat pitilessly on her throat; that throat on which her life was etched with fine lines, and in which now the pulse was still throbbing...
...persons accidentally locked in bank vaults from suffocation. It consists of a tank holding a 24-hour supply of oxygen. The locking of the door automatically switches on an electric light which illuminates a card of directions for the person locked in. The card tells how to turn the stopcock of the tank, which releases the oxygen gradually as needed. Mr. Bossom will not patent his device because of its humanitarian need. The first one is being made for a Galveston, Tex., bank. Many vault imprisonments which do not have fatal results are said to escape public notice...