Instructions for the use of the slide-rule, applied to computations relating to practical husbandry; and of the cattle guage, for ascertaining the carcase weight of oxen

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J. Hewitson, 1847 - 83 σελίδες

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Σελίδα 24 - In any right-angled triangle, the square which is described upon the side subtending the right angle, is equal to the squares described upon the sides which contain the right angle.
Σελίδα 24 - Either of the two shorter sides of a right-angled triangle is equal to the square root of the difference of the squares of the hypothenuse and the other side.
Σελίδα 27 - Multiply the sum of the parallel sides by the perpendicular distance between them, and half the product will be the area.
Σελίδα 30 - RULE. Multiply the side of the cube by itself, and that product again by the side ; and the last product will be the solidity required.
Σελίδα 19 - It is a property of proportional numbers, derived immediately from the definition, that the product of the first and fourth terms is equal to the product of the second and third.
Σελίδα 21 - The Rule of Three takes its name from the circumstance that three numbers are always given to find a fourth, which shall bear the same proportion to one of the given numbers as exists between the other two.
Σελίδα 29 - Take one-third of the product of the area of the base and the altitude. To find the surface of a pyramid or cone : Multiply the perimeter of the base by one-half of the slant height. Add the area of the base. The areas of similar surfaces are to each other as the squares of their like dimensions.
Σελίδα 23 - Set one of the numbers on C, to the same on D ; then against the other number on C, will be the mean on D.
Σελίδα 14 - His method is founded on these three considerations: 1st, that the sum of the logarithms of any two numbers is the logarithm of the product of those numbers...
Σελίδα 30 - To find the volume of a prism or cylinder : Multiply the area of the base by the altitude.

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