254 WEIGHT OF A SQUARE FOOT OF CAST IRON, ETC. WEIGHT OF A SQUARE FOOT OF CAST AND WROUGHT IRON, NOTE.-The SPECIFIC GRAVITY of the Wrought Iron is that of Pennsylvania plates, and of the Copper, that of plates from the works of Messrs. Phelps, Dodge, & Co., in Connecticut. The Lead, a mean from several places. WEIGHT AND CAPACITY OF CAST IRON AND LEAD BALLS. 255 WEIGHT AND CAPACITY OF CAST IRON AND LEAD BALLS, WEIGHT OF COPPER RODS OR BOLTS, From to 4 Inches in Diameter, WEIGHT OF RIVETED COPPER PIPES, From 5 to 30 Inches in Diameter, from 3 to 5ths thick, The above weights include the laps on the sheets for riveting and caulking. The weights of the rivets are not added; the number per lineal foot of pipe depends upon the distance they are placed apart, and their size upon the diameter of the pipe. COPPER. To ascertain the Weight of Copper. RULE.-Find by calculation the number of cubic inches in the piece, multiply them by .32118, and the product will be the weight in pounds. EXAMPLE. What is the weight of a copper plate an inch thick by 16 inches square? 162256 .5 for an inch. 128.0X.32118=41.111 pounds. LEAD. To ascertain the Weight of Lead. RULE.-Find by calculation the number of cubic inches in the piece, and multiply the sum by .41015, and the product will be the weight in pounds. EXAMPLE.-What is the weight of a leaden pipe 12 feet long, 34 inches in diameter, and 1 inch thick? By rule in Mensuration of Surfaces, to ascertain the area of cylindrical rings, Area of (3+1+1)= 25.967 To ascertain the Weight of ordinary Brass Castings. RULE.--Find the number of cubic inches in the piece, multiply by .3112, and the product will be the weight in pounds. Y 2 |