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This report describes experiments to study the burning of fires in a simple well-ventilated enclosure. These, the first in a programme covering various aspects of this subject, were made in a one foot cube with ventilation through one side. The combustible material was wood in the form of a crib and the rate of burning was obtained by continuous weighing. Measurements were made of the flame height, the radiation from the opening and the flames. The effect of different crib designs and weights of wood on these was studied. Only for 1 inch wood, the largest section used, was the effect of crib design negligible in these particular experimental conditions. The results will be discussed in detail when further data from tests in earlier models are available.