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| Keywords: The Kinematics of Machinery Fig 1.png en Hand-drawn diagram by James Watt explaining his discovery of the parallel motion in a letter to his Sohn The idea originated in this manner On finding double chains or racks and sectors very inconvenient for communicating the motion of the piston-rod to the angulat motion of the working-beam I set to work to try if I could not contrieve some means of performing the same form motions turning upon centres and after some time it occured to me that AB CD being two equal radii revolving on the centres B and C and connected together by a rod AD in moving through arches of certain length the variations from straight line would be nearly equal and opposite and that the point E would describe a line nearly straight and that if for convenice the radius CD was only half of AB by moving the point E nearer to D the same would take place; and from this the construction afterwards called the parallel motion was derived de Handzeichnung von James Watt aus einem Brief an seinen Sohn in dem er erklärt wie er auf die Idee des Wattgestänges gekommen ist James Patrick Muirhead The Life of James Watt with Selections from his Correspondence 1858 p 294 http //books google de/books id _b8GAAAAYAAJ dq James 20Patrick 20Muirhead 20 22The 20origin 20and 20progress 20of 20the 20mechanical 20inventions 22 pg PR3 v onepage q parallel f false hier online Quoted in Franz Reuleaux The Kinematics of Machinery Outlines of a Theory of Machines 1876 p 4 Macmillan London online here 1808-11-10 James Watt PD-old-100 Watt's linkage The Kinematics of Machinery James Watt | ||||
