Smith Sound
a passage of water leading to the Arctic regions, at the N. extremity of Baffin Bay, between Prudhoe, in Greenland, and Ellesmere Land. Its S. entrance was discovered by Baffin in 1616. In 1854 it was surveyed by a United States expedition under Dr. Elisha Kent Kane. A gulf 110 miles long was found at its N. E. end.
SMOKELESS POWDER.
POWDER: EXPLOSIVES.
See GUN- SMOKE NUISANCE. Smoke is caused by the incomplete combustion of fuel. It consists of finely divided particles, either of carbon or of hydrocarbons, the latter being, as a rule, liquid and oily. Under ideal conditions, there will be sufficient oxygen present to burn the carbon completely to oxides of carbon and also to decompose the hydrocarbons. It follows that with the right conditions of draught and temperature, no smoke will be pro- SMOKY HILL RIVER SMOLLETT duced, and with a good type of furnace under the control of a skilled and intelligent fireman, it is possible to burn even soft coal with the production of no more than a negligible quantity of smoke. Soft coal is more liable to produce smoke than hard coal because it contains a much larger proportion of volatile hydrocarbon, and for this reason its use in many cities is prohibited. Since smoke consists of unburned fuel, it follows that its elimination would be a saving to the coal consumer, provided the cost of elimination did not exceed the value of the coal. In spite of this, however, the smoke nuisance he had written. Failing in this, he 15th century. It was united to Russia in 1654. The capital is Smolensk. Pop. about 2,250,000. has become serious in cities in all parts of the world, and in most cases special legislation has been needed to combat it.