The Mechanic's Calculator: Comprehending Principles, Rules, and Tables in the Various Departments of Mathematics and Mechanics; Useful to Millwrights, Engineers, and Artisans in General

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Summer & Goodman, 1847 - 308 sider
 

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Side 55 - OF TIME. 60 Seconds = 1 Minute 60 Minutes = 1 Hour 24 Hours = 1 Day 7 Days = 1 Week 28 Days = 1 Lunar Month...
Side 22 - Multiply the numerators together for a new numerator, and the denominators together for a new denominator.
Side 82 - Thus, to draw a line through a given point parallel to a given line...
Side 23 - Rule. — Multiply the whole number by the denominator of the fraction, add the numerator to the product and place the denominator under the result.
Side 25 - The denominator of a decimal, though never expressed, is always the unit, 1, with as many ciphers annexed as there are figures in the decimal.
Side 115 - GLAZIERS' WORK. GLAZIERS take their dimensions, either in feet, inches, and parts, or feet, tenths, and hundredths. And they compute their work in square feet. ' In taking the length and breadth of a window, the cross bars between the squares are included. Also windows of round or oval forms are measured as square, measuring them to their greatest length and breadth, on account of the waste in cutting the glass.
Side 61 - A Pentagon is a polygon of five sides ; a Hexagon of six sides; a Heptagon, seven; an Octagon, eight; a Nonagon, nine : a Decagon, ten ; an Undecagon, eleven ; and a Dodecagon, twelve sides.
Side 255 - The areas of circles are to each other as the squares of their diameters.
Side 97 - Triangle. Take the square root of the sum of the squares of the short sides of the triangle.
Side 62 - Circumference, which is everywhere equidistant from a certain point within, called its Centre. The circumference itself is often called a Circle, and also the Periphery.

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