Archives of internal medicine . Chart 4. ing to whether the number of passengers was below 10, between 10 and15, between 15 and 20, or above 20. The averages of carbon dioxid and. Chart 5. number of passengers were determined for all observations falling in eachof these groups for each of the two classes of cars under considerationand are shown in Chart 5 along with the general averages for each class. THOMAS R. CROWDER lOo For the cars depending npon natural ventilation the general avera«t ai. supply =3U00° -->^ =^»->»t r- =2^0 crffpfrhiT ^^ ?? =p«=«-^^ »->- «--pp„ For car
Archives of internal medicine . Chart 4. ing to whether the number of passengers was below 10, between 10 and15, between 15 and 20, or above 20. The averages of carbon dioxid and. Chart 5. number of passengers were determined for all observations falling in eachof these groups for each of the two classes of cars under considerationand are shown in Chart 5 along with the general averages for each class. THOMAS R. CROWDER lOo For the cars depending npon natural ventilation the general avera«t ai. supply =3U00° -->^ =^»->»t r- =2^0 crffpfrhiT ^^ ?? =p«=«-^^ »->- «--pp„ For cars equipped with exhaust ventilators the general averages ofpassengers and carbon dioxid for all observations are 14 82 and 6 11respectively and the equivalent hourly air-supplv 42,100 cubic feet Wraging all observation in these cars when there were- = 3Xe
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