NUMBER OF SQUARE FEET IN PLATES 3 TO 32 FEET LONG, AND 1 INCH WIDE. For other widths, multiply by the width in inches. 1 sq. in. = :.0069 sq. ft. CAPACITIES OF RECTANGULAR TANKS IN U. S. GALLONS, FOR EACH FOOT IN DEPTH. 29.92 37.40 44.88 52.36 59.84 67.32 74.81 82.29 89.77 97.25 104.73 46.75 56.10 65.45 74.80 84.16 93.51 102.86 112.21 121.56 130.91 67.32 78.54 89.77 100.99 112.21 123.43 134.65 145.87 157.09 91.64 104.73 117.82 130.91 144.00 157.09 170.18 183.27 119.69 134.65 149.61 164.57 179.53 194.49 209.45 . 151.48 168.31 185.14 201.97 218.80 235.67 187.01 205.71 224.41 243.11 261.82 226.28 246.86 267.43 288.00 269.30 291.74 314.18 316.05 340.36 112.21 119.69 127.17 134.65 142.13 149.61 157.09 164.57 172.05 179.53 6 140.26 149.61 158.96 168.31 177.66 187.01 196.36 205.71 215.06 224.41 168.31 179.53 190.75 202.97 213.19 224.41 235.63 246.86 258.07 269.30 6 196.36 209.45 222.54 235.63 248.73 261.82 274.90 288.00 301.09 314.18 224.41 239.37 254.34 269.30 284.26 299.22 314.18 329.14 344.10 359.06 6 252.47 269.30 286.13 302.96 319.79 336.62 353.45 370.28 387.11 403.94 280.52 299.22 317.92 336.62 355.32 374.03 392.72 411.43 430.13 448.83 308.57 329.14 349.71 370.28 390.85 411.43 432.00 452,57 473.14 493.71 336.62 359.06 381.50 403.94 426.39 448.83 471.27 493.71 516.15 538.59 364.67 388.98 413.30 437.60 461.92 486.23 510.54 534.85 559.16 583.47 6 6 392.72 418.91 445 09 471.27 497.45 523.64 549.81 575.99 602.18 628.36 6 420.78 448.83 476.88 504.93 532.98 561.04 589.08 617.14 645.19 673.24 478.75 508.67 538.59 568.51 598.44 628.36 658.28 688.20 718.12 6 540.46 572.25 604.05 635.84 667 63 699.42 731.21 763.00 605.92 639.58 673.25 706.90 740.56 774.23 807.89 675.11 710.65 746.17 781.71 817.24 852.77 748.05 785.45 822.86 860.26 897.66 824.73 864.00 903.26 942.56 905.14 946.27 987.43 989.29 1032.3 9. 6 6 6 1077.2 NUMBER OF BARRELS (31 1-2 GALLONS) IN Logarithms (abbreviation log).—The log of a number is the exponent of the power to which it is necessary to raise a fixed number to produce the given number. The fixed number is called the base. Thus if the base is 10, the log of 1000 is 3, for 103 = 1000. There are two systems of logs in general use, the common, in which the base is 10, and the Naperian, or hyperbolic, in which the base is 2.718281828 The Naperian base is commonly de noted by e, as in the equation ex, in which y is the Nap. log of x. In any system of logs, the log of 1 is 0; the log of the base, taken in that system, is 1. In any system the base of which is greater than 1, the logs of all numbers greater than 1 are positive and the logs of all numbers less than 1 are negative. The modulus of any system is equal to the reciprocal of the Naperian log of the base of that system. The modulus of the Naperian system is 1, that of the common system is .4342945. The log of a number in any system equals the modulus of that system X the Naperian log of the number. The hyperbolic or Naperian log of any number equals the common log X 2.3025851. Every log consists of two parts, an entire part called the characteristic, or index, and the decimal part, or mantissa. The mantissa only is given in the usual tables of common logs, with the decimal point omitted. The characteristic is found by a simple rule, viz., it is one less than the number of figures to the left of the decimal point in the number whose log is to be found. Thus the characteristic of numbers from 1 to 9.99+ is 0, from 10 to 99.99 is 1, from 100 to 999+ is 2, from .1 to .99+ is 1, from .01 to .099 is 2, etc. Thus |