PROCEDURES 



The tobacco warehouse (fig. 1) used in this study was approximately 180 feet long, 

 130 feet wide, and 20 feet high. The side walls were constructed of sheet metal; the 

 roof was sheet metal with outside surface coated with tar; and the floor was concrete. 

 Five roof vents were located along the peak of the shallow A-frame roof. Vents along 

 the sides of the building were closed throughout the year. Ventilation in the building 

 was restricted primarily to leakage around the side vents and aisle doors, and air 

 moved from these points toward the roof vents. Throughout the year, the warehouse 

 held nearly its full capacity of 3,696 hogsheads. 



The hygrothermographs used to monitor outside and warehouse temperature and 

 relative humidity were equipped with 7- day clocks and hair sensors for humidity detec- 

 tion. An official U. S. Weather Bureau Station was used to house the outside instrument. 

 The station was located approximately 30 feet from a side of the warehouse. 



A central aisle 12 feet wide separated the warehouse into two equal sections. 

 Space near the center of one section was alloted for a monitoring station. At this station, 

 warehouse temperature and relative humidity were monitored at elevations of 2, 8, and 

 16 feet above floor level. From a row. of hogsheads nested four tiers high near the 

 station, a hogshead from each tier along a diagonal line was selected for monitoring 



Figure 1. — Tobacco warehouse used in climatic study. 



5 



