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| Keywords: Huygens clock.png Christiaan Huygens inventor of the pendulum clock Drawing is from his treatise Horologium Oscillatorium published 1673 Paris and it records improvements to the mechanism that Huygens had illustrated in the 1658 publication of his invention titled Horologium It is a weight driven clock the weight chain is removed with a verge escapement K L with the 1 second pendulum X suspended on a cord V The large metal plate T in front of the pendulum cord is the first illustration of Huygens' 'cycloidal cheeks' an attempt to improve accuracy by forcing the pendulum to follow a cycloidal path making its swing isochronous Huygens claimed it achieved an accuracy of 10 seconds per day Each gear is labeled with the number of teeth it has Alterations to image Cropped out figure number converted to 32 color PNG <br><br> Labeled parts A front plate B back plate C minute wheel D weight chain pulley E third wheel pinion F third wheel G third seconds wheel H contrate wheel I crown wheel pinion K crown wheel L pallets M verge N P verge supports Q R crown wheel shaft supports S crutch T cycloidal cheeks V pendulum rod suspended from two cords hidden behind cycloidal cheeks X pendulum bob Y hour hand Z λ second hand ζ hour wheel Δ rate adjustment weight Retrieved June 27 2008 from http //books google com/books id iVkFJs5XkjQC pg PA38 sig ACfU3U3p9V3vG_TMAqumf02Bh-jd7bht_g Harold C Kelly 2007 Clock Repairing as a Hobby A How-To Guide for Beginners Skyhorse Publishing ISBN 160239153X p 38 fig 13 on Google Books creator Christiaan Huygens 1673 Public domain - author died in 1695 Image Early Pendulum Clock Christian Huygens jpg PD-old-100 Pendulum clocks Clockworks Old horology prints Christiaan Huygens | ||||
