Weight per Bushel (even Winchester) of different Grains, Seeds, &c. Weight per Barrel (Legal or by Usage) of different Articles. A Gallon of Train Oil weighs 7 lbs. "Molasses, standard, (75 per cent.,) 113 " A 66 Weight of Coals, &c., broken to the medium size, per Measure of The Capacity. average weight of Bituminous Coals, broken as above, is about 62 per cent. that of a bulk of equal dimensions in the solid mass, or of the specific gravity of the article; that of Anthracite is about Chestnut Wood, 66 66 4880 Meadow Hay, well settled, per cubic foot, 81 lbs., or Meadow Hay, in large old stacks, per cubic foot, Clover Hay, in settled bulk, Corn on Cob, in crib, 66 shelled, in bin, Wheat, in bin, Oats, in bin, Potatoes, in bin, 9 66 66 66 22 Common Brick, 78 × 38 × 21 in. “M, 8 X 4 X 2 in. "" ROPES AND CABLES. 6185 The STRENGTH of cords depends somewhat upon the fineness of the strands; — damp cordage is stronger than dry, and untarred stonger than tarred; but the latter is impervious to water and less elastic. SILK cords have three times the strength of those of flax of equal circumference, and MANILLA has about half that of hemp. Ropes made of IRON WIRE are full three times stronger than those of hemp of equal circumference. White ropes are found to be most durable. The best qualities of hemp are- ·1. pearl gray; 2. greenish; 3. yellow. A brown color has less strength. THE BREAKING WEIGHT of a good hemp rope is 6400 lbs. per square inch, but no cordage may be counted on with safety as capable of sustaining a weight or strain above half that required to break it, and the weight of the rope itself should be included in the estimate. THE RELIABLE STRENGTH of a good hemp cable, in pounds, is usually estimated as equal to the square of its circumference in inches X by 120. That of rope X 200. Thus, a cable of 9 inches in circumference may be relied on as having a sustaining power = 9 X 9 X 120 = 9720 lbs. = the THE WEIGHT, in pounds, of a cable laid rope, per linear foot square of its circumference in inches X .036, very nearly. The weight, in pounds, of a linear foot of manilla rope = the square of its circumference in inches X .03, very nearly. Thus, a manilla rope of three inches circumference weighs per linear foot 3 X 3 X .03 fo lbs., = 37% feet per lb. = A good hemp rope stretches about, and its diameter is diminished about before breaking. Comparative Weight of Metals, Weight per Measure of Solidity, &c Exhibiting the Weight in pounds of One Foot in Length of Wrought or Rolled Iron of any size, (cross section,) from § inch to 12 inches, SQUARE BAR. Size Weight Size Weight Size Weight Size Weight in Inches. in in in in in in in Pounds. Inches. Pounds. Inches. Pounds. Inches. Pounds. 25.560 4} 84.480 8 244.220 1.320 21 27.939 51 88.784 82 258.800 2.588 31 33.010 53 97.657 9 289.220 9305.056 35.704 5 102.240 31 38.503 5 106.953 9 321.332 5.280 3 6.390 39 44.418 5 7.604 32 47.534 8.926 31 14 10.352 4 21 17.112 41 68.448 7190.136 12 486.656 |