simple pendulumn.
/ˌsɪmpl ˈpɛndjᵿləm/, /ˌsɪmpl ˈpɛndʒᵿləm/, U.S. /ˌsɪmpəl ˈpɛndʒələm/, /ˌsɪmpəl ˈpɛndjələm/ 1. A pendulum consisting only of a bob suspended by a cord or wire, spec.: (a) (in a clock) one which is not equipped with a mechanism that compensates for the effects of heat, friction, etc.; †(b) one which is not a part of a mechanism and is designed to approximate an ideal pendulum (see sense 2) for use in measuring gravity or oscillatory phenomena (obsolete).
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the world > time > instruments for measuring time > clock > [noun] > pendulum clock > pendulum
pendule1660
pendulum1660
simple pendulum1673
bob-pendulum1685
swing1696
quicksilver pendulum1726
pendle1741
gridiron pendulum1751
mercurial pendulum1786
gridiron1793
wanrest1794
seconds pendulum1795
conical pendulum1813
ticker1821
noddy1844
1673 Philos. Trans. (Royal Soc.) 8 6069 A simple Pendulum being no Certain and Equal Measure of time, in regard that larger excursions are observ'd to be slower than the narrower.
1688 R. Waller tr. Meas. Earth xii. 5 in A. Pitfield tr. C. Perrault Mem. Nat. Hist. Animals 'Tis commonly known, that to make a simple Pendulum, a little ball about the bigness of a Musquet Bullet, is suspended by a very flexible thread, and the length of this Pendulum must be measured from the top of the thread to the center of the Ball.
1795 C. Hutton Math. & Philos. Dict. II. 210 Simple Pendulum, and Detached Pendulum, are terms sometimes used to denote such Pendulums as are not connected with any clock, or clock-work.
1862 H. Worms Earth & its Mechanism iv. 45 The clock-work is set in motion, and the simple pendulum also.
1975 D. Howse Greenwich Observatory III. xi. 127 Before 1726 he acquired two more clocks from Graham, with dead-beat escapements and simple pendulums, for £12 each.
2004 R. J. Matthys Accurate Clock Pendulums i. 4 A common rate adjustment scheme for simple pendulums is to slide the top end of the suspension spring up and down through a narrow slot.
2. A theoretical or ideal pendulum, consisting of a single point that has mass but no extent, is suspended by a massless inextensible rod, and moves without friction.
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the world > space > relative position > support > hanging or suspension > [noun] > that which hangs or is suspended > a pendulum > types of
compound pendulum1723
simple pendulum1728
inverted pendulum1773
horizontal pendulum1775
conical pendulum1813
spherical pendulum1862
the world > movement > motion in specific manner > alternating or reciprocating motion > oscillation > [noun] > swinging or oscillation of suspended body > that which > pendulum > types of
compound pendulum1723
simple pendulum1728
inverted pendulum1773
horizontal pendulum1775
conical pendulum1813
spherical pendulum1862
1728 E. Chambers Cycl. at Pendulum Simple Pendulum, is that consisting of a single Weight..considered as a point.
1864 Proc. Royal Soc. 1863–4 13 392 When the motion of the particles of air follows the law of oscillation of a simple pendulum, the resulting sound may be called a simple tone.
1948 A. L. Rawlings Sci. Clocks & Watches (ed. 2) iii. 26 For the present we will disregard the stiffness of the suspension spring and the mass of the rod; that is to say, we will suppose we have what is called a simple pendulum.
2010 C. Roberts Ordinary Differential Equations iv. 200 A simple pendulum can be modelled by a second order homogeneous linear differential equation with constant coefficients.
This entry has been updated (OED Third Edition, September 2019; most recently modified version published online March 2022).
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