Mensuration, Mechanical Powers and Machinery: The Principles of Mensuration Analytically Explained, and Practically Applied to the Measurement of Lines, Superfices and Solids : Also a Philosophical Explanation of the Simple Mechanical Powers and Their Application to Machinery : Designed for the Use of Schools and Academies

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J.W. Prentiss & Company, 1849 - Arithmetic - 128 pages
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Page 29 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; and each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds ; and these into thirds, etc.
Page 58 - Multiply one half the sum of the parallel sides by the perpendicular distance between them.
Page 15 - ... 3. A pile of wood 8 feet long, 4 feet wide, and 4 feet high, contains 1 cord; and a cord foot is 1 foot in length of such a pile.
Page 13 - Pendulum vibrating Seconds of Mean Time in the Latitude of London in a Vacuum at the Level of the Sea is in the proportion of Thirty-Six Inches to Thirty-Nine Inches and one thousand three hundred and ninety-three ten-thousandth Parts of an Inch...
Page 13 - TABLE. 144 square inches (sq. in.) make 1 square foot, marked sq. ft. 9 square feet 1 square yard,
Page 109 - X by the circumference of a circle whose radius is equal to the length of the lever.
Page 51 - The sum of two numbers, and the difference of their squares given, to find those numbers. RULE. Divide the difference of their squares by the sum of the numbers, and the quotient will be their difference.
Page 11 - Thus it is a law of the nature of water that under the mean pressure of the atmosphere at the level of the sea, it boils at 212 Fahrenheit.
Page 98 - Mechanical Powers, are certain simple instruments, commonly employed for raising greater weights, or overcoming greater resistances, than could be effected by the natural strength without them. These are usually accounted six in number, viz. the Lever, the Wheel and Axle, the Pulley, the Inclined Plane, the Wedge, and the Screw.
Page 47 - To measure a parallelogram, or long square. RULE. Multiply the length by the breadth, and the product will be the area, or superficial content.

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