## Scribner's Engineers' and Mechanics' Companion: Comprising United States' Weights and Measures; Mensuration of Superficies and Solids ... The Mechanical Powers ... Steam and the Steam Engine |

### From inside the book

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... CENTERS .

... CENTERS .

**CENTER OF GRAVITY**. To ascertain the Power of a Breast- 110 Wheel " 6 66 46 of Surfaces 111 66 of Solids • 112 113 Fraudulent Balances GRAVITATION OF FALLING BODIES 114 Table showing Time , Space , and Ve- . 159 Notes on Water ... Page 104

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**center of gravity**being assumed to be over the fulcrum . THE WHEEL AND AXLE , OR PERPETUAL LEVER . The principle of the wheel and axle is so analogous to that of the lever , that it may be considered next in the order of mechanical ... Page 110

... CENTERS . These are the

... CENTERS . These are the

**centers of gravity**, oscillation , percussion , and gyration .**CENTER OF GRAVITY**. The**center of gravity**of a body , or any system of bodies con- nected , is a point about which , if suspended , all the parts are ... Page 111

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**center of gravity**of two or more bodies , is the point about which they would equiponderate , or rest in any position . If the**centers of gravity**of two bodies , A and B ...**Center of Gravity**of a Circular Arc MECHANICAL CENTERS . 111. Page 112

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**Center of Gravity**of a Circular Arc . Rule . - Radius of circle × chord of arc length of arc ter of gravity from the center of the circle . = distance of the cen- To find the**Center of Gravity**of the Sector of a Circle . Rule . - 2 x ...### Common terms and phrases

angle avoirdupois axis axle base body brass breadth bushel cast iron center of gravity center of percussion centrifugal force chord circle Circum circumference coal conductor copper Cube Root cubic feet cubic foot cubic inches cylinder decimal denominator depth Diam discharged distance Ditto divide the product divisor engine engine-man Example.-Required Example.-What feet per second find the Area find the Center fluid friction frustrum gallons given number grains heat Hog's lard length lever linseed oil Litharge measure metal minute motion multiply number of teeth number of terms orifice ounces pendulum perpendicular pipe pitch Pounds pressure proportion quantity of water radius revolutions per minute rope Rule Rule.-Multiply screw Segment side specific gravity Spirits turpentine square inch square root steam steel subtract TABLE Tallow timber tons Tredgold troy turpentine unguent velocity versed sine VULGAR FRACTIONS wheel wood wrought iron yards Zink

### Popular passages

Page 14 - To reduce a mixed number to an improper fraction. RULE. Multiply the whole number by the denominator of the fraction, and to the product add the numerator for a new numerator, and place it over the denominator. 1. Reduce 127T^ to an improper fraction.

Page 162 - When no unguent is interposed, the friction of any two surfaces, whether of quiescence or of motion, is directly proportional to the force with which they are pressed perpendicularly together ; so that for any two given surfaces of contact there is a constant ratio of the friction to the perpendicular pressure of the one surface upon the other. Whilst this ratio is thus the same for the same surfaces of contact, it is different for different surfaces of contact. The particular value of it in respect...

Page 53 - To find the solidity of a sphere or globe. Rule.— Multiply the cube of the diameter, ce, by the decimal .5236.

Page 49 - Sphere is a body bounded by a uniformly curved surface, all the points of which are equally distant from a point within called the center.

Page 162 - When no unguent is interposed, the amount of the friction is, in every case, wholly independent of the extent of the surfaces of contact ; so that the force with which two surfaces are pressed together being the same, their friction is the same, whatever may be the extent of their surfaces of contact.

Page 46 - To find the solidity of a cube or right prism. Rule. — Multiply the area of the base by the perpendicular height, and the product will be the solid contents.

Page 18 - Having given the first term, the common difference, and the number of terms, to find the last term.

Page 18 - Find the greatest square number in the first or left hand period, place the root of it at the right hand of the given number, (after the manner of a quotient in division) for the first figure of the root, and...

Page 241 - ... per cent., and even less, in some kinds. Steel may be distinguished from iron by its fine grain; its susceptibility of hardening by immersing it, when hot, in cold water ; and with certainty by the action of diluted nitric acid, which leaves a black spot on steel, and on iron a spot which is lighter colored in proportion as the iron contains less carbon. There are many varieties of steel, the principal of which are : Natural steel, which is obtained by reducing the rich and pure kinds of iron...

Page 103 - The velocity given to find the space fallen through, to acquire that velocity. RULE. — Divide the velocity by 8, and the square of the quotient will be the distance fallen through to acquire that velocity.