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112
tained in the early autumn when the weather was abnormally mild.
In spite of the opportunities thus afforded for the opening of windows,
it was noticed that there were large variations in the figures and it was
therefore decided to make a further series of observations during the
winter months under different conditions of temperature, time and
occupation. These further results were obtained in the Girls' School
and have been divided into three groups according to the use made
of the means provided for natural ventilation.
Series B.— Winterbourne Road Girls' School.
Recognized accommodation of room, Co girls.
Ventilation —
Windows open 942 sq. inches (average).
Hoppers open 3,892 sq., inches (average).
Special inlet open 104 sq. inches.
Spccial outlet open 104 sq. inches.
Months.—October, November, December, and January.
Number of observations, 8.
Average number of occupants, 55 children and 1 adult.
Average temperature. Dry bulb 56 deg. F. Highest 60 deg.
Wet bulb 53.6 deg. F.Lowest 52 deg.
Average C.0.2 parts per 10,000, 10. External air 3.37.
Number of occasions below 9 parts per 10,000 2
do. between 9 and 12 parts per 10,000 5
do. above 12 parts per 10,000 1
Total observations 8
Best Result. — October 23rd at 4.5 o'clock, 35 minutes after
interval. Slight N.E. breeze. Outside temperature: 50 deg. C.O2
was 6 parts per 10,000 with 47 children and one adult present.
Worst Result.—December 4th at 4 p.m. Still, wet day. Outside
temperature : 48 deg. C.O2 was 14 parts per 10,000 with 55 children
and one adult present.
In these observations all the means of ventilation were made use
of, though not always to their fullest extent. As a rule the hoppers
were fully opened, and the windows only to a small extent.