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Class-room, No. V. Infants', lit by four batswing burners, burning 40 cub. ft. per hour.
Owing to the ceiling being lit the vault of the room looks comparatively well lit.
Compare the light on the floor and details in the right-hand corner with the next
figure. Maximum light: '7 foot candles. This is greater than shown on the plan as
new burners were installed for the photograph. The best comparison of the light on
the desks is made by covering the upper part of this and the next diagram as low
down as the top of the clock.
The same class-room lit with six Bray's 1912 inverted burners, consuming 4 cub. ft. per
hour at 30/10 pressure. Note the light on the desks and floor and details in right-hand
corner. Cost rather over 3/4d. per hour. Equivalent light by electricity estimated at
3d. per hour. Maximum light, 5 foot-candles; minimum, 3.5 foot-candles.