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APPENDIX.
VENTILATION OF SCHOOLS.—In my report to the Education
Committee for 1908 I mentioned that, with the co-operation of Dr.
Gerrard, I had arranged for a series of observations to be made on the
ventilation of schools. Most of the work was done at Winterbourne
Road, as this building is a typical central hall school. For the
sake of comparison a further set of observations was made at Oval
Road, which is an old school without any central hall.
In Winterbourne Road School the means provided for ventilation
are sash windows and hoppers together, with special inlets and outlets.
The special inlets are fixed behind the hot water radiators, and the
outlets are situated at the floor level and communicate with ventilating
shafts. Heating is by low pressure hot water radiators.
The following is a summary of the results obtained :—
Series A.— Winterbourne Road School. Girls and Infants
Months.—October and November.
Number of observations, 29.
Average C. O2 parts per 10,000 8.6.
External air, 3.7.
Number of occasions below 9 parts per 10,000 14
do. between 9 and 12 parts per 10,000 13
do. above 12 parts per 10,000 2
Total observations 29
Best Result.— On October 13th, a warm day, with 9,680 square
inches of window and hopper open, and 51 infants and one adult
present. C.02. was 5 parts per 10,000. External temperature
62 deg. F. (Accommodation 60).
Worst Result.—On November 5th, at 3.25, Room 7, Girls'
Department, with 57 children present and 5,180 inches open windows
and hoppers. There were 16 parts per 10,000 C.02. Outside
temperature 50 deg. F. (Accommodation 54).
In these observations the amount of carbonic acid found under
actual school conditions was recorded without pre-arrangement of the
windows, ventilators or heating apparatus. These results were