A Synopsis of Practical Mathematics: Containing Plain Trigonometry; Mensuration of Heights, Distances, Surfaces, and Solids; Surveying of Land, Gauging, Navigation, and Gunnery. With Tables of the Logarithms of Numbers and of Sines and Tangents. For the Use of Schools and Men of Business

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T. Cadell, London, and C. Elliot, Edinburgh, 1779 - 266 σελίδες

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Σελίδα 254 - And in division, subtract the logarithm of the divisor from the logarithm of the dividend, the remainder is the logarithm of the quotient.
Σελίδα 255 - Rule. Multiply the Logarithm of the given number by the Index of the proposed power, and the product will be the Logarithm, whose natural number is the power required.
Σελίδα 16 - The diameter of a circle is a right line drawn through the centre, and terminating in the circumference on each side, as AB.
Σελίδα 175 - Circles are great circles which pass through the zenith and nadir, and cut the horizon at right angles.
Σελίδα 174 - Zone, between the Tropic of Cancer and the Arctic Circle, is called the North Temperate Zone, and...
Σελίδα 255 - Complement of a Logarithm. Begin at the left hand, and write down what each figure wants of 9, only what the laft fignificant figure wants of ю j fo the Сотр.
Σελίδα 16 - The sine of an arc is a line drawn from one end of the arc, perpendicular to the radius or diameter drawn through the other end : or, it is half the chord of double the arc ; thus HL is the sine of the arc HB.
Σελίδα 129 - Becaufe every cone is the third part of a cylinder of the fame bafe and altitude, Multiply the area of its bafe by one third part of its height ; the product is the foiidity.
Σελίδα 202 - ... 9" with the meridian. And 3dly. That the differences of longitude on different rumbs, are to one another as the tangents of the angles of those rumbs with the meridian. Hence it follows, that the difference of the log. tangents of the half complements of the latitudes, is to the difference of longitude a ship makes...
Σελίδα 252 - If the logarithm is not found exa£Uy in the tables, and more than four figures are required, fubtraft the logarithm found in the table from the given one, and divide the remainder by the difference between the logarithm found and the next greater ; the quotient joined to the four figures already found, gives the number anfwering to the logarithm. EXAMPLES. To find the number anfwering to the logarithm 2.7342957.

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