own. It paralyses traffic, it is dangerous to pedestrians, it enc

n the sea, too, the fog is disagreeable and fraught with danger. The fog-horn is heard, in its d

se fog. Sometimes during the day, through a thinner portion, the sun will be dimly seen in copper h

Without dust there could be no fogs, there would be only dew on the grass and road. Instead of the dust-impregnated air

ange effect is noticed. In the vessel containing common air the steam will be seen rising in a dense cloud; then a beautiful white foggy cloud will be formed, so dense that it cannot be seen through. But in the vessel containing the filtered air, the steam is not seen at all; there is not the s

undance of dust in the air and little water-vapour present, there is an over-proportion of dust-particles; and the fog-particles are, in consequence, closely packed, but light in form and small in size, a

re that, if the two-thousandth part of a grain of fine iron be heated, and the dust be driven off and carried into a glass re

himneys in towns. The brilliant flame, as well as the smoky flame, is a fog-producer. If gas is burnt in filtered air, intense fog is produced when water-vapour is introduced. Products of combu

nsumed in London. Now, the average amount of sulphur in English coal is one and a quarter per cent. That would give no less than 93,750 tons of sulphur burned every year in London fires. Now, if we reckon that on an average twice the quantity of coals is consumed there on a winter d