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Compound Interest ......
215 Displacement of Vessels.
To find the Velocity necessary to
and Wrought Iron, Copper, and
As often as a character is repeated, 3=III.
so many times is its value repeated. 4 = IV. 55V.
A less character before a greater 6 = VI.
diminishes its value, as IV=I from 13VII.
V, or 1 subtracted from 5=4.
A less character after a greater in10 =X.
creases its value, as XI = X+I, or 20=XX.
For every annexed, this be-
For every C and , placed one at 1,000 M, or CIO. each end, it becomes 10 times as
many. 2,000 = MM. 6,000 =V, or 15. 6,000 = VI. 10,000 = X, or CCIII. 50,000 L, or 1.3.
A bar, thus, over any
number, increases it 1000 60,000LX.
times. 100,000 =, or CCCI. 1,000,000 =M, or CCCCI300. 2,000,000 =MM. EXAMPLES.-1840, MDCCCXL.
EXPLANATIONS OF THE CHARACTERS USED IN THE FOLLOWING
TABLES AND CALCULATIONS. Equal to, as, 12 inches 1 foot, or 8x8 = 16 X4. + Plus, or more, signifies addition; as, 4+6+5 = 15.
- Minus, or less, signifies subtraction; as, 15–5=10. X Multiplied by, or into, signifies multiplication; as, 8X9=72. • Divided by, signifies division; as, 72-7-9=8. : Is to
? :: so is
to 16. : to ✓ Prefixed to any number signifies that the square root of that
number is required ; as, ✓16=4; that is, 4X4=16. y Signifies that the cube root of that number is required; as,
364 = 4; that is, 4X4X4= 64. added to a number signifies that that number is to be squared ;
thus, 42, means that 4 is to be multiplied by 4. 3 added to a number signifies that that number is to be cubed ;
thus, 4*, is =4X4X4=64. The power, or number of times a number is to be multiplied by itself is shown by the num
ber added; as, 2 3 4 5, &c. The bar signifies that the numbers are to be taken together ;
as, 8–2+6= 12, or 3X5+3= 24. Docimal point, signifies when prefixed to a number, that that
number has a unit (1) for its denominator; as, .l is jó, .155
is 15.5., &c. is Signifies difference, and is placed between two quantities when
it is not evident which of them is the greater. • Degrees,' minutes, " seconds," thirds. < Signifies angle. a—, a-, -3, &c., denote inverse powers of a, and are equal
&c. 7 Is put between two quantities to express that the former is
greater than the latter; as, a 7 b, reads a greater than b. L Signifies the reverse; as, a lb, reads a less than b. () Parentheses are used to show that all the figures within them
are to be operated upon as if they were only one ; thus,
(3+2)x5=25. p is used to express the ratio of the circumference of a circle to
its diameter 3.1415926, &c. A AA" A" signifies A, A prime, A second, A third, &c. axd, a.d, or ad, signifies that a is to be multiplied by d.
Note. The degrees of temperature used in this work are those of Fahrenheit.