Archives of internal medicine . Chart 14. not even the opening of a door while it was standing. It represents thehighest average contamination, at 5:15 a. m., of any car yet examined;and had the sampling been carried forward from this time it would prob-ably show that the increase had nearly reached its maximum. 124 THE ARCHIVES OF IXTERXAL MEDICINE The effect of starting the train is invariably to bring down the carbondioxid rapidly. After thirty minutes it has reached as low a point as itc nt expected to maintain. Chart 15 will illustrate the condition betterthan any description. A light bre
Archives of internal medicine . Chart 14. not even the opening of a door while it was standing. It represents thehighest average contamination, at 5:15 a. m., of any car yet examined;and had the sampling been carried forward from this time it would prob-ably show that the increase had nearly reached its maximum. 124 THE ARCHIVES OF IXTERXAL MEDICINE The effect of starting the train is invariably to bring down the carbondioxid rapidly. After thirty minutes it has reached as low a point as itc nt expected to maintain. Chart 15 will illustrate the condition betterthan any description. A light breeze only was blowing when observa-tions were Chart 15 THE ENTRANCE AND DISTRIBUTION OF AIR It has been showB that an average of over 40,000 c^bic f eet of air perhour enters the breathing-zone of sleep^ng-cars ^P-f^;* ^^iMhaust ventilator herein considered. It has been lurxueiannroSmately twice this much air leaves from the upper portion of thecLthrZh the si. or eight ventilators used. In the absence of specifici^Ltes H is dfflcult to determine exactly in what manner this air findsan entrance. THOMAS R. CROWDER 125 Sleeping-cars are snugly built; the crevices are small; but no creviceis too small to admit air, provided a little pressure is behind it. A rowof windows covers each side of the car, another row of small ones extendsalong each side at the deck level, and each end has a door. There is asum. total of approximatel}^ 500 lineal feet of crevices at their edges. Ifthey average one-fiftieth of an inch in width and admitted air at halfthe rate of the train speed, the 40,000 cubic feet would be more thanaccounted for. Some of
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