# ENGINEERS AND MECHANICS POCKET BOOK

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### Contents

 Dotation 11 Mint Value of Foreign Coins 17 Vulgar Fractions 23 Duodecimals 30 Permutation 36 To find the Moons Age 42 MENSURATION OF SURFACES 59 Parabolas and Hyperbolas 65
 STATICS 182 Centres of Percussion and 188 Friction 194 Evaporation 200 boiling Points 8rc 206 Noncondensing Engine 212 Materials for Boilers 219 Evaporative Power of Coals 225

 Areas of the Segments of 72 Lengths of Semielliptic Arcs 78 Of Hyperboloids and Hyperbolic 86 Circumferences of Circles 95 To find the Square of a Number 116 Plane Trigonometry 123 Wheel and Axle 130 CENTRES OF GRAVITY 137 Gravities of Bodies 143 Deflexion 156 Velocity of Wheels 162 HYDRAULICS AND HYDRODYNAMICS 170 Water Wheels 176
 Tables of various Experiments with 232 Dimensions and Weight of Guns 238 Weight of Square Rolled Iron 246 Weight of Cast Iron Pipes 252 Cables and Anchors 258 Displacement of Vessels 266 Babbitts MetalFall of Ram fye 273 Table of Reciprocals 279 Merchant Steamers and Iron 286 IRON VESSELS 293 Cotton Press 299 Tubular Boilers 305

### Popular passages

Page 47 - The circumference of every circle is supposed to be divided into 360 equal parts, • called degrees, each degree into 60 minutes, and each minute into 60 seconds, etc.
Page 48 - Similar figures, are those that have all the angles of the one equal to all the angles of the other, each to each, and the sides about the equal angles proportional.
Page 24 - To reduce a whole number to an equivalent fraction, having a given denominator. RULE. Multiply the whole number by the given denominator, and place the product over the said denominator, and it will form the fraction required.
Page 15 - Capacity. 4 gills = 1 pint. 2 pints = 1 quart. 4 quarts = 1 gallon. 2 gallons = 1 peck. 4 pecks = 1 bushel. 8 bushels = 1 quarter. Time. 60 seconds 60 minutes 24 hours 7 days 365 days minute. hour. day. week, year. Solidity. 1728 cubic inches = 1 cubic foot 27 cubic feet = 1 cubic yard. Apothecaries
Page 37 - Fellowship is when different stocks are employed for any certain equal time. RULE.* — As the whole stock is to the whole gain or loss, so is each man's particular stock to his particular share of the gain or loss.t PROOF. — Add all the shares together, and the sum will be equal to the gain or loss, when the work is right.
Page 81 - Take the length of the keel within board (so much as she treads on the ground) and the breadth within board by the midship beam, from plank to plank, and half the breadth for the depth, then multiply the length by the breadth, and that product by the depth, and divide the whole by 94; the quotient will give the true contents of the tonnage.
Page 28 - ... from the right hand of the quotient, point off so many places for decimals, as the decimal places in the dividend exceed those in the divisor.
Page 188 - Now the distance of the centre of oscillation from the point of suspension...
Page 24 - To reduce a mixed number to an improper fraction. RULE. — Multiply the whole number by the denominator of...
Page 204 - ... above the upper deck"; the breadth thereof at the broadest part above the main wales, half of which breadth shall be accounted the depth of such vessel, and then deduct from the...