. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 24 BULLETIN tt, U. S. DEPARTMENT OP AGRICULTURE. these systems were soon discarded. Even the best arrangements now in common use leave much to be desired in the way of circula- tion. Cars of type B (Table 5) show an average difference of 7 de- grees between the bunker end and center of the car under ordinary icing. The cars of type D, with heavier insulation, maintain a lower average temperature throughout the car, but, even in this case, the center of the car averages 5° F. warmer than the bunker end. These difference
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 24 BULLETIN tt, U. S. DEPARTMENT OP AGRICULTURE. these systems were soon discarded. Even the best arrangements now in common use leave much to be desired in the way of circula- tion. Cars of type B (Table 5) show an average difference of 7 de- grees between the bunker end and center of the car under ordinary icing. The cars of type D, with heavier insulation, maintain a lower average temperature throughout the car, but, even in this case, the center of the car averages 5° F. warmer than the bunker end. These differences are sometimes dis- astrous in their. ' -Sr-:^-—-*<P^iV7$E?- effects on poultry shipments. TEMPERATURE IN CAR. DIFFERENCE BETWEEN BUNKER AND CENTER. In many shipments the tempera1- ture at the ends of the car, next to the ice bunkers, is sufficiently low to transport the poultry in an excellent state of preservation. At the same time the temperature at the center, 8 or 10 degrees warmer, is so high that the goods from this part of the car are at a disadvantage of five or six days of market time as compared with the bunker goods. In figure 13, a, is presented the temperature rec- ord for the end and center of the car in Experiment 2078, car type D. The atmos- pheric temperature during the haul averaged 50° F. (10° C), with a minimum of 42° F. (° C.) and a maximum of 61° F. (° C). The differences in temperature between the bunker and the center of the car were comparatively small in this shipment, and the analyses of the samples carried at the bunker show good preservation. The findings of the chemical laboratory are in group 1 of Table 2. The efficiency of this car was Figure 13, b, shows another shipment, Experiment 2096, car type C, where a wide difference in temperature is manifest between the two positions in the car. The atmospheric temperature averaged 54° F. (° C), with a minimum of 49° F. (° C.) and a maximum of 61° F. (° C). Th
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