In 1865 the first displays of fireworks in the United States, illustrating historical events, were made by a company in New York City. They were the pioneers in this line of displays. Their success was immediate, and from these displays has grown the successes of today in pyrotechnics. Fireworks now enter into the celebration of every important event in our national, political and business life. The celebrations at Washington, D. C., at the inaugurations of our Presidents, the coronations of emperors and kings in lands beyond our borders, are all brought to a close by brilliant displays of fireworks. The writer, in visiting the plant of a large fireworks manufacturer, found that they were turning out large quantities of time fuses and primers for shrapnel shells for the foreign powers, and are working night and day on orders for the United States government on aeroplane bombs and signals. They have also worked out a searchlight projectile which is arranged to burst in the air, throwing out a number of luminous bodies that light up the surrounding country and reveal the movements of the enemy. All large displays of fireworks are now fired by electricity and every known color and effect is produced by the pyrotechnist of the present day. The water displays are scarcely less varied, consisting of flying fish, diving devils, prismatic fountains, floating batteries, fiery geysers and submarine torpedoes, all of which, being ignited and thrown into the water, go through their stunts as readily as other kinds do on land and in the air. From every part of the civilized world, from Mexico, Central and South America and Europe, orders for fireworks come in increasing numbers to American firms, who now lead the world in this art. The Philippines will soon be a customer for them, and with the general opening up of China to modern civilization, from causes now in operation, it will not be strange if some day we should supply fireworks to the land of their origin. * * * * * What Makes a Chimney Smoke? Smoky chimneys are usually caused either by the presence of other buildings obstructing the wind and giving rise to irregular currents of air, or by improper construction of the fireplace and adjacent parts of the chimney. The first may generally be cured by fixing a chimney-pot of a particular construction, or a revolving cowl, on the chimney top, in order to prevent the wind blowing down; in the second case the narrowing of the chimney throat will generally create a better draft. The longer a chimney is, the more perfect is its draft, provided the fire is great enough to heat the column of air in it, because the tendency of the smoke to draw upwards is in proportion to the difference of weight between the heated air in a chimney and an equal column of external air. The first we hear of chimneys, for the escape of the smoke from a fire or furnace, is in the middle ages. [Illustration: FLOATING DRY DOCK “DEWEY”