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114
Series D.— Wititerbourne Road Girls' School,
Recognised accommodation of room, 60 girls,
Ventilation.
Windows closed.
Hoppers closed.
Special inlet open 104 sq, inches.
Special outlet open 104 sq. inches.
Months.—February and March.
No. of observations, 19.
Average number of occupants. Girls 42, adults 1.
Average temperature. Dry bulb 55. Highest 58.
Lowest 54.
Wet bulb 49.
Average C.O 2 parts per 10,000, 19. External air 3 4.
Number of occasions below 9 parts per 10,000 0
do. between 9 and 12 parts per 10,000 0
do. above 12 parts per 10,000 9
Total observations 19
Best Result.—February 24th, at 3 15 p.m., that is one hour and a
quarter after occupancy. E.N.E. breeze. Temperature outdoors 35
deg. F. 52 scholars and 1 teacher present. The C.O2 was 13 parts
per 10,000. The windows, however, had only been shut for half-anhour
previous to examination of the air.
Werst Result.—February 26th. At 3.30, one and a half hours
after occupancy. Northerly breeze. Temperature outdoors 35 deg F.
49 scholars and 1 adult present. The C.O.2 was 29 parts per 10,000.
Here the usual interval at 3.15 was postponed.
February 25th, at 3.30, one and a half hours after occupancy.
E.N.E. breeze. Temperature outdoors 34 deg. F. 53 scholars and I
adult present. C.O. was 23 parts per 10,000.
During these observations both sash windows and the hoppers
were closed in order that we might demonstrate how very unsatisfactory
the air became under these conditions. The instructions as to heating
and ventilation exhibited in the class rooms suggest that the special
inlets and outlets are sufficient for ventilation provided the windows are
open when the rooms are vacated. It is clear, however, that this is not
the case.