NOTE.-By these tables, land measure and artificers' work are computed. NOTE.-A cubic foot is equal to 2200 cylindrical inches, or 3300 spherical inches, or 6600 conical inches. A cubic foot of water equals 62 lbs.; a cylindrical foot equals 49'1; a cubic inch equals 03617 lbs.; a cylindrical inch equals '02642 lbs. NOTE.-The Winchester bushel (so called because the standard measures were kept at Winchester) is 18 inches diameter, and 8 inches deep, and contains 2150 42 cubic inches. bushel. 1 chaldron MISCELLANEOUS MEASURE. For Various Purposes. =36 bushels, or 57.25 cubic feet. 1 perch of stone = 16 cubic feet. 1 hand 1 span = 4 inches. 9 inches. charcoal, (hard wood)" MEASURES OF WEIGHT.-TROY. By which Gold, Silver, and Precious Stones are weighed. NOTE.-An ounce of gold is divided into 24 equal parts, called carats, and an ounce of silver into 20 parts, called penny weights; therefore, to distinguish fineness of metals, such gold as will abide the fire, without loss, is accounted 24 carats fine; if it lose 2 carats in trial, it is called 22 carats fine, &c. A pound of silver which loses nothing in trial is 12 ounces fine; but if it lose 3 pennyweights, it is 11 ounces 17 pennyweights fine, &c. * By comparing the number of grains in the advoirdupois and troy pound and ounce, respectively, it appears that the tioy pound is less than the avoirupois in the proportion of 14 to 17.0138; but the troy ounce is greater than the avoirdupois in the proportion of 79 to 72. Hence, the following approximating rules for changing avoirdupois weight to troy, and troy to advoirdupois, will often be found very convenient and useful. The standard U. S. gallon measures 231 cubic inches, and contains 8.3388822 pounds avoirdupois = 58372-1757 grains troy, of distilled water, at its maximum density 39.83° Fahrenheit, and 30 inches barometer height. The English Imperial gallon measures 277 274 cubic inches, containing 10 lbs. avoirdupois of distilled water, weighed in air, at the temperature of 62°, the barometer at 30 inches. CUBIC, OR SOLID MEASURE. To find the Cubical Contents in a Stick of Timber. If all the dimensions are in feet, multiply the length by the breadth, and this product by the depth, to obtain the number of cubic feet. If the length is in feet and the width and depth in inches, multiply the length by the width, and this product by the depth in inches ; then divide the last product by 144 for the cubic feet. If all the dimensions are in feet and inches, reduce the whole to inches; then multiply the length, breadth and depth together, and divide the product by 1728, to obtain the cubic feet. The French unit of length, called the metre, has been taken as being the ten millionth part of the quadrant of a meridian passing through Paris; that is to say, the ten-millionth part of the distance between the equator and the pole, measured through Paris. It is equal to 39-3707898 inches. The metre is divided into one thousand millimetres, one hundred centimetres, and ten decimeters; while a decameter is ten metres; a hectometre one hundred metres, a kilometre one thousand metres, and a myriametre ten thousand metres. The following table gives the value of these measurements in English inches and yards: One English yard is equal to 0·91438 metre; while one mile is equal to 1.60931 kilometres. Unit of Surface. For the unit of surface, the square inch, foot, and yard adopted in this country and in England are replaced in the metric system by the square millimetre, centimetre, decimetre, and metre. 1 square metre 1·1960333 square yards. 1 square inch =6·4513669 square centimetres. =9-2899683 square decimetres. =0·83609715 square metre. 1 square foot 1 square yard = 0 10 60 70 80 90 100 254.00 256.54 259-08 | 261.62 264·16 | 266.70 269.24 271.78 274-32 276.85 Ct. Mt. Ct. Mt. Ct. Mt. Ct. Mt. Ct. Mt. Ct. Mt. Ct. Mt. Ct. Mt. Ct. Mt. Ct. Mt. 0.000 2.540 5.080 7.620 10.16 12.70 15.24 17.78 20.32 22.86 25.40 27.00 30.48 33.02 35.56 38.10 40.64 43.18 45.72 48.26 20 50.80 53.31 55.88 58.42 60.96 63.50 66.04 68.58 71.12 73.66 30 76.20 78.74 81.28 83.82 86.36 88.90 91.44 93.98 96.52 99.06 40 101.60 104 14 106.68 109-22 111.76 114.30 116.84 119.38 121.92 12446 50 127.00 129-54 132:08 134.62 137-16 139.70 142.24 144.78 147.32 | 149.86 152 40 154.94 157.48 160-02 162.56 165.10 167.64 170-18 172.72 175.26 177.80 180 34 182.88 185:42 187.96 190 50 193.04 195.58 198-12 200.96 203 20 205 74 208.28 210.82 213:36 215.90 218:44 220.98 223 52 226.06 228.60 231-14 233.68 236-22 238.76 241.30 243.84 246:38 248.92 251.46 |