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| Keywords: Wilberforce pendulum.jpg Photo of a Wilberforce pendulum a coupled mechanical oscillator consisting of a weight suspended from a helical spring that is free to both bob up and down and rotate back and forth about its vertical axis with torsional vibrations It is mounted on a stand for use in physics demonstrations The weight consists of two adjustable masses mounted on a horizontal threaded rod that can be screwed in or out to adjust the torsional vibration period of the weight Downloaded 2009-10-18 from http //books google com/books id _xRJAAAAMAAJ pg PT19 dq 22Wilberforce+spring 22 lr as_brr 1 source gbs_selected_pages cad 3 v onepage q 22Wilberforce 20spring 22 f false W E Dalby Feb 10 1908 Balancing of Reciprocating Engines in Proceedings of the Institution of Mechanical Engineers 1908 Part 1 London Plate 9 Fig 5 following p 550 on Google Books 1908 W E Dalby Public domain Dalby died in 1936 PD-old Torsion pendulums | ||||
