The mechanic's calculator, or Workman's memorial book

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Side 2 - Multiply the numerators together for a new numerator, and the denominators together for a new denominator.
Side 42 - OF TIME. 60 Seconds = 1 Minute 60 Minutes = 1 Hour 24 Hours = 1 Day 7 Days = 1 Week 28 Days = 1 Lunar Month...
Side 52 - 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, &c.
Side 52 - The Height or Altitude of a figure is a perpendicular let fall from an angle, or its vertex, to the opposite side, called the base.
Side 110 - These are usually accounted six in number, viz. the Lever, the Wheel and Axle, the Pulley, the Inclined Plane, the Wedge, and the Screw.
Side 48 - Parallel lines are always at the same perpendicular distance ; and they never meet, though ever so far produced. 10. Oblique lines change their distance, and would meet, if produced on the side of the least distance. 11. One line is Perpendicular to another, when it inclines not more on the one side than the other, or when the angles on both sides of it are equal. 12.
Side 1 - Hence the usual rule to reduce fractions to a common denominator: Multiply each numerator by all the denominators except its own for new numerators, and all the denominators together for the common denominator.
Side 59 - If a straight line be divided into any two parts, the square on the whole line is...
Side 133 - ... the square root of the quotient will be the distance of the centre of gyration, from the centre of motion.
Side 60 - AB, bisecting it into the two equal parts AD, DB ; then will the sum of the squares of AC, CB, be equal to twice the sum of the squares of CD, BD; or Ac* -f CB* = 2CD* + 2DB*.

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