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Chimney Draft

CHIMNEY DRAFT.

Cornish boilers, slow rate 4-6 lbs. per sq. ft. per hour.

Cornish boilers, ordinary rate 10-15 lbs. per sq. ft. per hour.

Factory boilers, ordinary rate 12-18 lbs. per sq. ft. per hour.

Anthracite coal, quick rate 15-20 lbs. per sq. ft. per hour.

Bituminous coal, quick rate 20-30 lbs. per sq. ft. per hour.

Marine boilers, ordinary rate, 15-25 lbs. per sq. ft. per hour.

Water tube boilers 10-25 lbs. per sq. ft. per hour.