Models of natural draft cooling towers were made, in the form of circular shells with ventilation at their bases. Measurements of the pressure distribution on them were taken varying the ventilation height H and the aspect ratio h/d, where d is the diameter of the model tower and h is the height of the tower. The inside pressure distributions of the model tower are almost constant in spite of variation of the ventilation height. Moreover, it is found that the pressure drag has its maximum value at H/d＝^^?0.125 and becomes constant in the range H/d＞__?0.4 for each aspect ratio
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