Elementary Introduction to Practical Mechanics: Illustrated by Numerous ExamplesLongmans, 1870 - 324 pages |
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Page ix
... Screw - Friction on a Pivot - Endless Screw 129 CHAPTER VII . Equilibrium of Body resting on an Axle.
... Screw - Friction on a Pivot - Endless Screw 129 CHAPTER VII . Equilibrium of Body resting on an Axle.
Page 129
... SCREW . SECTION I. 72. Reaction of Surfaces . It nearly always happens that amongst the forces which keep a body at rest is the reaction of one or more sur- FIG . 86 . faces ; to explain the nature of this reaction let us con- sider a ...
... SCREW . SECTION I. 72. Reaction of Surfaces . It nearly always happens that amongst the forces which keep a body at rest is the reaction of one or more sur- FIG . 86 . faces ; to explain the nature of this reaction let us con- sider a ...
Page 144
... screw would be reduced if it became merely a line . Ex . 377. If the distance between two turns of a thread of a screw ( or its pitch ) is hand the radius of the cylinder is r , show that the length of n turns of the thread is n√4π22 ...
... screw would be reduced if it became merely a line . Ex . 377. If the distance between two turns of a thread of a screw ( or its pitch ) is hand the radius of the cylinder is r , show that the length of n turns of the thread is n√4π22 ...
Page 145
... screw ; if now the lower part of this pro- jection be cut away , so as to leave a protect- ing piece of uniform thickness , we shall obtain a screw with a square thread , as shown in fig . 97 , * a section of which made by a plane ...
... screw ; if now the lower part of this pro- jection be cut away , so as to leave a protect- ing piece of uniform thickness , we shall obtain a screw with a square thread , as shown in fig . 97 , * a section of which made by a plane ...
Page 146
... screw ( or its pitch ) , rand r1 the radii of the external and internal cylinders , and 0 and 01 the angles of inclination of the external and internal helices , show that tan ( 01 - 0 ) = 2πη ( r - 1 ) 4π2 rr1 + h2 and show that the ...
... screw ( or its pitch ) , rand r1 the radii of the external and internal cylinders , and 0 and 01 the angles of inclination of the external and internal helices , show that tan ( 01 - 0 ) = 2πη ( r - 1 ) 4π2 rr1 + h2 and show that the ...
Common terms and phrases
ABCD angle of resistance angular angular velocity axis axle beam body brickwork cast iron centre of gravity circle circumference coefficient of friction Crown 8vo cubic foot curve cylinder described determine the number diameter direction distance draw Edition engine epicycloid equal equation equilibrium expended extrados forces acting formula friction frustum given hence horizontal horse-power inclined inclined plane last Example length limiting angle magnitude mass middle point minute modulus moment of inertia motion moving number of units oscillation P₁ parallel forces passing perpendicular plane pressure principle principle of moments Prop pulley R₁ radius raised reaction represent respectively rest resultant right angles rope round screw sliding space square inch steam suppose surface teeth thick thread tion triangle vertical vols wall weight wheel Woodcuts wrought iron
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