Elementary Introduction to Practical Mechanics: Illustrated by Numerous ExamplesLongmans, 1870 - 324 pages |
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Page 111
... thread from any point B ; now the forces in equi- librium are the tension of the string and the weight of the body ; they must therefore act along the same line , so that the required centre of gravity must be in the prolongation BC Of ...
... thread from any point B ; now the forces in equi- librium are the tension of the string and the weight of the body ; they must therefore act along the same line , so that the required centre of gravity must be in the prolongation BC Of ...
Page 144
... thread of a 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 ...
... thread of a 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 ...
Page 145
... thread of a screw , though a very common object , has a very remarkable form ; for instance , the curve FIG . 97 ... thread , as is the case with the screw represented in the figure , it is usual to have a second intermediate ...
... thread of a screw , though a very common object , has a very remarkable form ; for instance , the curve FIG . 97 ... thread , as is the case with the screw represented in the figure , it is usual to have a second intermediate ...
Page 146
... thread between a and b ( fig . 97 ) , the curve of section will be a helix , as indicated by the dotted line ; the triangles whose hypothenuses form these helices will all have the same height , viz . aa , or bb2 ( fig . 98 ) , but ...
... thread between a and b ( fig . 97 ) , the curve of section will be a helix , as indicated by the dotted line ; the triangles whose hypothenuses form these helices will all have the same height , viz . aa , or bb2 ( fig . 98 ) , but ...
Page 147
... thread of the screw вс exactly fits ; the end c of the screw is fixed to the piece DE in such a manner that the screw is free to turn , while the piece DE can only move in a vertical direction in consequence of the guides FF , and FF ...
... thread of the screw вс exactly fits ; the end c of the screw is fixed to the piece DE in such a manner that the screw is free to turn , while the piece DE can only move in a vertical direction in consequence of the guides FF , and FF ...
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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