## Mechanics for Practical Men: Containing Explanations of the Principles of Mechanics, the Steam Engine, with Its Various Proportions, Parallel Motion, the Principles of which are Fully and Clearly Investigated, with Practical Rules, Adapted to the Commonest Capacity, Tables of Safety-valve Levers, Tables of Parallel Motions, Tables of the Weight of Cast Iron Pipes, Tables of Various Kinds, on Cast and Wrought Iron, for the Use of Founders, Smiths, &c., Strength and Stress of Materials, Centres of Gravity, Gyration, & C., Central Forces, with Their Application to the Theory of Fly Wheels, &c., Hydrostatics, and Hydraulics ; with a Short Dissertation on Rail-roads, & Cauthors, 1833 - 208 pages |

### From inside the book

Results 1-5 of 56

Page

...

...

**Hence**the friction of the large cylinder to the friction of all the small ones :: 3.1416 dn : 3 · 1416 d n :: √n : n , which , in the case of four small cylinders , becomes 1 to 2 that is , the friction of four cylinders is double the ... Page 10

... .. 2 B C2 = 20o or B C2 = 4002 , therefore B C = 200 1414 pounds .

... .. 2 B C2 = 20o or B C2 = 4002 , therefore B C = 200 1414 pounds .

**Hence**the force with which we draw the body horizon- tally is 14.14 pounds . 33. To find the resultant of any number of forces 10 MECHANICS FOR PART I. Page 11

...

...

**Hence**it follows that if any number of forces be represented by the sides of a polygon taken in order , as P A , A b , bc , cd , their resultant will be represented by the line P d , that completes the polygon . THE MECHANICAL POWERS ... Page 12

... forces ; therefore , P : W : CF : FO or B C. But since E B is parallel to C F , and B C to F D , the triangles C E B and C D F are similar ; therefore C D ; CE CFC B. 1

... forces ; therefore , P : W : CF : FO or B C. But since E B is parallel to C F , and B C to F D , the triangles C E B and C D F are similar ; therefore C D ; CE CFC B. 1

**Hence**, by equality , P : W :: CD 12 MECHANICS FOR. Page 13

...

...

**Hence**, by equality , P : W :: CD : CE . That is , each force is reciprocally proportional to the distance of its direction from the fulcrum . Cor . 1. When the two forces act perpendicularly on the lever , as two weights , then , in ...### Other editions - View all

Mechanics for Practical Men: Containing Explanations of the Principles of ... James Hann,Isaac Dodds No preview available - 2018 |

Mechanics for Practical Men: Containing Explanations of the Principles of ... James Hann,Isaac Dodds No preview available - 2013 |

### Common terms and phrases

20 inches accelerating force angle avoirdupois axle beam boiler breadth carriage cast iron centre of gravity centre of motion circumference connecting rod crank cube root cylinder depth direction distance divided divisor engine equal equilibrium Example feet per second find the length fluid foot force acting formula friction frustrum fulcrum and valve given half Hence horizon inclined plane lever leverage load miles an hour minute multiplied number of strokes ounces parabola parallel bar parallel motion pendulum perpendicular piston pounds pressure proportional pulley quantity of matter quotient will give radius rod resistance revolutions per minute rope rule sine space described specific gravity square inch square root steam sustain thickness tion tons Tredgold triangle velocity acquired vertex wheels whole length whole weight WXCW

### Popular passages

Page 156 - As the weight lost in water is to the whole, or absolute weight ; so is the specific gravity of water ' " to "the specific gravity 'of the body . 2.

Page 186 - Engine, &c. do not exceed five tons, then the gross weight to be drawn need not exceed fifteen tons, and in that proportion for Machines of still smaller weight, provided that the Engine, &c. shall still be on six wheels, unless the weight (as above) be reduced to four tons and a half or under, in which case the Boiler, &c.

Page 158 - As the tabular specific gravity of the body, Is to its weight in avoirdupois ounces, So is one cubic foot^ or 1728 cubic inches, To its content in feet, or inches, respectively.

Page 11 - MECHANICAL POWERS are certain simple instruments employed in raising greater weights, or overcoming greater resistance than could be effected by the direct application of natural strength. They are usually accounted six in number; viz. the Lever, the Wheel and Axle, the Pulley, the Inclined Plane, the Wedge, and the Screw.

Page 46 - The centres of gravity of the surface of a cylinder, of a cone, and of a conic frustrum, are respectively at the same distances from the origin as are the centres of gravity, of the parallelogram, triangle, and trapezoid, which are vertical sections of the respective solids.

Page 186 - Feet. 5th. -The weight of the Machine, with its complement of water in the Boiler, must, at most, not exceed Six Tons; and a Machine of less weight will be preferred if it draw after it a proportionate weight; and if the weight of the Engine, &c.

Page 21 - ... the power, multiplied by its distance from the fulcrum, is equal to the weight, multiplied by its distance from the same point. Prom this, simple rules may be deduced for calculation. To know the power to be applied, at a certain distance from the fulcrum...

Page 188 - ... boiler shall be cold, and there shall be no fuel in the fire-place. As much fuel shall be weighed, and as much water shall be measured and delivered into the tender-carriage as the owner of the engine may consider sufficient for the supply of the engine for a journey of thirtyfive miles. The fire in the boiler shall then be lighted, and the quantity of fuel consumed for getting up the steam shall be determined, and the time noted. " The tender-carriage, with the fuel and water, shall be considered...

Page 188 - The time of performing every trip shall be accurately noted, as well as the time occupied in getting ready to set out on the second journey. Should the engine not be enabled to take along with it sufficient fuel and water for the journey of ten trips, the time occupied in taking in a fresh supply of fuel and water shall be considered and taken as a part of the time in performing the journey. JU Rastrick, Esq., Stourbridge, CE Nicholas Wood, Esq., Killingworth, CE John Kennedy, Esq., Manchester. Liverpool,...

Page 156 - ... so that the mass compounded of the two may sink together. Weigh the denser body and the compound mass, separately, both in water and out of it ; then find how much each loses in water, by subtracting its weight in water from its weight in air ; and subtract the less of these remainders from the greater. Then...