965.15 7601018.77 800=1072.39 840=1126.01 880=1179.62920=1233.24 1020. 10 1 1073.73 1 1127.35 1 1180.97 1 1234.58 1021.45 2 1075.07 2 1128.69 2 1182.31 2 1235.92 1076.41 3 1130.03 3 1183.65 3 1237.27 1077.75 4 1131.37 4 1184.99 4 1238.61 720 1 966.49 1 967.83 2 971.85 5 973. 19 974.53 7 975.87 8 9 977.21 6 1025.47 5 1079.09 5 1132.71 5 1186.33 5 1239.95 1026.81 6 1080.43 6 1134.05 6 1187.67 6 1241.29 1028.15 7 1081.77 7 1135.39 7 1189.01 7 1242.63 1029.49 8 1083.11 8 1136.73 8 1190.35 8 1243.97 9 1030.83| 9 1084.45 9 1138.07 9 1191.69 9 1245.31 1234 4 730= 978.55 770-1032. 17 810=1085.79 850=1139.41 890=1193.03 930=1246.65 979.89 1 1033.51 1 1087.13] 1 1140.75 1 1194.37 1 1247.99 2 981.23 2 1034.85 2 1088.47 2 1142.09 2 1195.71 2 1249.33 3 982.57 3 1036.19 3 1089.81 3 1143.43 3 1197.05 3 1250.67 983.91 4 1037.53 4 1091.15 4 1144.77 4 1198.39 4 1252.01 5678 8 985.25 5 1038.87 5 1092.49 5 1146.11 5 1199.73 5 1253.35 986.60 6 1040.21 6 1093.83 6 1147.45 6 1201.07 6 1254.69 987.94 7 1041.55 7 1095.17 7 1148.79 7 1202.41 7 1256.03 989.28 8 1042.90 8 1096.51 8 1150.13 8 1203.75 8 1257.37 9 990.62 9 1044.24 9 1097.86 9 1151.47 9 1205.09 9 1258.71 5 991.96 780-1045.58 820=1099.20 860-1152.82 900=1206.43 940=1260.05 993.30 1 1046.92 1 1100.54 1 1154.16 1 1207.77 1 1261.39 994.64 2 1048.26 2 1101.88 2 1155.50 2 1209.12 2 1262.73 995.98 3 1049.60 3 1103.22 3 1156.84 3 1210.46 3 1264.08 997.32 4 1050.94 4 1104.56 4 1158.18 4 1211.80 4 1265.42 998.66 5 1052.28 5 1105.90 5 1159.52 5 1213.14 5 1266.76 6 1000.00 6 1053.62 6 1107.24 6 1160.86 6 1214.48 6 1268.10 7 1001.34 7 1054.96 7 1108.58 7 1162.20 7 1215.82 7 1269.44 8 1002.68 8 1056.30 8 1109.92 8 1163.54 8 1217.16 8 1270.78 9 1004.02 9 1057.64 9 1111.26] 9 1164.88 9 1218.50 9 1272.12 750-1005.36 7901058.98 830=1112.60 870=1166.22 910=1219.84 950=1273.46 1 1006.70 1 1060.32 1 1113.94 1 1167.56 1 1221.18 1 1274.80 2 1008.04 2 1061.66 2 1115.28 2 1168.90 2 1222.52 2 1276.14 3 1009.38 3 1063.00 3 1116.62 3 1170.24 3 1223.86| 3 1277.48 4 1010.72 4 1064.34| 4 1117.96| 4 1171.58 4 1225.20 4 1278.82 5 1012.06 5 1035.68 5 1119.30 5 1172.92 5 1226.54 5 1280.16 6 1013.40 6 1067.02 6 1120.64 7 1014.75 7 1068.36 7 1121.98 1174.26 6 1227.88 6 1281.50 1175.60 7 1229.22 7 1282.84 8 1016.09 8 1069.71 8 1123.32 8 1176.94 8 1230.56 8 1284.18 9 1017.43 9 1071.05 9 1124.66 9 1178.28 9 1231.90 9 1285.52 SECTION 2 WEIGHTS AND MEASURES MEASURES OF LENGTH Line Measurement is used in measuring distances. Any convenient unit may be employed, as -inch, foot, yard or mile. The standard unit of length is the yard. In 1813 Mr. Hassler obtained for the use of the United States Coast Survey a standard brass bar 82 inches long, graduated by Troughton, of London. The graduations of this bar were accepted as corresponding at the temperature of 62° F. to the standard yard of Great Britain. The standard yard adopted by the United States Treasury Department was the 36 inches between the 27th and the 63d inches of the above 82-inch bar. The symbols: for feet and " for inches are used in dimensioning drawings, often in books, and in correspondence. EXAMPLE.-18′ 7′′: = 18 feet 7 inches. The foot is commonly divided for civil engineers into tenths and hundredths of a foot. At the United States Custom Houses, the yard is divided into tenths and hundredths. A mile of 5,280 ft. is called a statute mile. It is the legal mile of the United States and Great Britain. Surveyors' Linear Measure is used in measuring land. The unit of this measure is Gunter's chain, 66 feet or 4 rods in length, having 100 links, each joined to the adjacent one by three smaller links. A square chain is one-tenth of an acre, or 10,000 square links. City surveyors and civil engineers commonly use steel tapes 100 feet long, the feet divided into tenths and hundredths. OTHER LINEAR DIMENSIONS IN USE 1 hand = = 4 inches. Used in measuring the heights of horses. = 120 fathoms, or 720 feet; commonly written cable-length. 1 cable 1 knot NOTE.-A knot is a velocity, not a length. It is used to express the speed of a ship at sea. EXAMPLE.-15 knots per hour. |