The Load Of A Dust Storm

Blown dusfc is a general and familiar nuisance to bousekeepers over the en tire west. A niiniirinm estímate, verified by direct observación, for the quautity of dust settling on floors duriug such Btorrus is abont a fourteenth of an ounce of dust on a snrface of a square yard in iialf a day. A inaxirnnru estímate made on the basis of the above newspaper accounts would be at least five pouuds to a square yard of snrface for a storra lasting 34 bours. If we then suppose that a house that is Ï4 feet wide and 82 feet long has open crevices, whjch average a sixteenth of an inch in width and have a running length in Windows and doors of 150 feet, the wind may be supposed to enter half of these crevices with a velocity of five miles per honr f oi the time the storm lasts, orfor 24 hours. The dust may be supposed to settle on not less than 85 square yards of surface, including floor space and horizontal surfaces of furniture. The minimum estimate, based on these figures, givesus 225 tons of dust to the cubic mile of air. The maximum estímate would be 126,000 tons. -