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An x-ray study of limes of different plasticity
824
U.S.
BUREAU OF MINES NOTES.
[J. F. [.
occurring in the blast-furnace. In the course of that study, samples of gas and stock were taken across a series of planes at various heights in the furnace. The intemion is to extend this investigation ultimately to several blast-furnaces in order to note the variations in cyanide concentration with variations in charge and operating conditions. The measurements for one furnace have been completed. Technical Paper 39 ° gives the results and a r6sum6 of previous work bearing on the subject. CARBON MONOXIDE
R E C O R D E R A N D ALARM.
By $. H. Katz.
AT THE request of the New York State Bridge and Tunnel Commission, which desired information on the contamination of tunnel air by carbon monoxide in the exhaust gases of automobile engines, the Bureau of Mines made tests to obtain necessary data for a ventilating system for the Holland vehicular tunnels under the Hudson River at New York City, now being constructed. The data obtained for the Holland tunnels were applicable to the Liberty vehicular tunnels at Pittsburgh, Penna., completed in 1924 . Four parts of carbon monoxide in IO, OOO parts of air were determined as the maximum concentration to which a person may be exposed for one hour without noticeable effects; or, if the concentration is increased from zero uniformly for one hour, the maximum concentration tolerable is six parts per IO,OOO, averaging three parts per hour. An apparatus that would automatically determine and record such low concentrations of carbon monoxide was developed by the Bureau of Mines. The recorder is equipped with a bell to warn attendants in the fan house should the CO in its section at any time exceed four parts in IO,OOO. Further, the recorder can effect considerable saving in power at the fan house if the volume of air is reduced when the CO is low. Carbon monoxide recorders should be useful wherever CO is an important factor because of hygienic, technical, or economic reasons, or in gaseous processes when CO can be introduced as an inert component. The recorder has proved to be the most sensitive instrument known for determining carbon monoxide. Details are given in Technical Paper 355, just issued by the Bureau.
U.S.
BUREAU OF MINES NOTES.
[J. F. [.
occurring in the blast-furnace. In the course of that study, samples of gas and stock were taken across a series of planes at various heights in the furnace. The intemion is to extend this investigation ultimately to several blast-furnaces in order to note the variations in cyanide concentration with variations in charge and operating conditions. The measurements for one furnace have been completed. Technical Paper 39 ° gives the results and a r6sum6 of previous work bearing on the subject. CARBON MONOXIDE
R E C O R D E R A N D ALARM.
By $. H. Katz.
AT THE request of the New York State Bridge and Tunnel Commission, which desired information on the contamination of tunnel air by carbon monoxide in the exhaust gases of automobile engines, the Bureau of Mines made tests to obtain necessary data for a ventilating system for the Holland vehicular tunnels under the Hudson River at New York City, now being constructed. The data obtained for the Holland tunnels were applicable to the Liberty vehicular tunnels at Pittsburgh, Penna., completed in 1924 . Four parts of carbon monoxide in IO, OOO parts of air were determined as the maximum concentration to which a person may be exposed for one hour without noticeable effects; or, if the concentration is increased from zero uniformly for one hour, the maximum concentration tolerable is six parts per IO,OOO, averaging three parts per hour. An apparatus that would automatically determine and record such low concentrations of carbon monoxide was developed by the Bureau of Mines. The recorder is equipped with a bell to warn attendants in the fan house should the CO in its section at any time exceed four parts in IO,OOO. Further, the recorder can effect considerable saving in power at the fan house if the volume of air is reduced when the CO is low. Carbon monoxide recorders should be useful wherever CO is an important factor because of hygienic, technical, or economic reasons, or in gaseous processes when CO can be introduced as an inert component. The recorder has proved to be the most sensitive instrument known for determining carbon monoxide. Details are given in Technical Paper 355, just issued by the Bureau.