| OCR Text |
Show Deadly Gas Made to Sound Warning of Its Approach WASHINGTON. A lightweight light-weight portable device that rings a warning bell or sounds a horn when deadly carbon monoxide gas gets too plentiful in an airplane cabin or cockpit has been perfected by S. H. J. Womack and J. B. Peterson of the National Bureau of Standards Stand-ards here. Recent tests show that very small amounts of the deadly gas, contained in the exhaust of airplane and other engines, may be dangerous, danger-ous, particularly in high altitude flying. Only five parts In 100,000 of air are permissible at an altitude alti-tude of 15,000 feet. Earlier carbon monoxide indicators indica-tors used commercially and by the U. S. navy were modified and redesigned re-designed by the two Bureau of Standards scientists. The heart of the instrument is a cell containing a granular mixture of manganese dioxide and copper oxide, which changes the carbon monoxide Into carbon dioxide with generation of heat. Accurate measurement of heat rise indicates the amount of the deadly gas present. |
