Archives of internal medicine . ir-supply remain-ing the same. The excess is here ; half of it is ; adding this TABLE 10. -COMPARISON OF BERTHS WITH ONE OCCUPANT AND BERTHS WITHTWO OCCUPANTS Berths having two occupants. Berths having one occupant. Equivalent Equivalent Hourly Hourly Cars. Series. CO2 per 10,000. Air-Supply per Berth, Cubic Feet. CO2 per 10,000. Air-Supplyper Berth,Cubic Feet. 1 48 —()* 1,653 2,083 2 29 —() 1,846 1,181 3 54 —() 2,183 2,325 4 59 —() 1,481 1,290 5 64 () 2,667 2,113 6 73 —() 1,54
Archives of internal medicine . ir-supply remain-ing the same. The excess is here ; half of it is ; adding this TABLE 10. -COMPARISON OF BERTHS WITH ONE OCCUPANT AND BERTHS WITHTWO OCCUPANTS Berths having two occupants. Berths having one occupant. Equivalent Equivalent Hourly Hourly Cars. Series. CO2 per 10,000. Air-Supply per Berth, Cubic Feet. CO2 per 10,000. Air-Supplyper Berth,Cubic Feet. 1 48 —()* 1,653 2,083 2 29 —() 1,846 1,181 3 54 —() 2,183 2,325 4 59 —() 1,481 1,290 5 64 () 2,667 2,113 6 73 —() 1,546 1,163 7 75 () 2,521 1,775 Totals —Average. () 2,027 1,785 * In parenthesis are given the figures representing one-half of the excess carbon dioxidplus 4. This would represent the carbon dioxid which should be found had the berth hadone occupant and had the air-supply been the same. It is directly comparable with thefigures in the carbon dioxid column for berths having one Chart 11. half to the normal, 4, gives which should have been the carbon dioxidin these berths with the same ventilation and only one occupant. Thisis, by a coincidence, Just equal to the observed general average for alllower berths occupied by one person in the same class of cars; and theeffective ventilation of the berths is therefore at the same rate, namely,equivalent to 2,027 cubic feet of air per hour. This equality does nothold good when we compare berths with one and with two occupants in 118 TEE ARCHIVES OF INTERNAL MEDICINE the same cars only; but the discrepancies are not greater than might befound by comparing any two berths of the same car. Table 10 makesthe comparison in detail; and the greater number of observations madewhen berths were occupied by two persons are shown in Chan 11. THE BERTH CURTAIN* AND DIFFUSION Popular opinion ascribes better ventilation to the upper than to thelower berth in a sleeping-car. The reason generally g
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