Horology is the Science of Time, Timekeepers (Clocks, Watches) and Timekeeping


This page is under constant construction. Please comtribute URLs of pages that fit under this heading by contacting Fortunat Mueller-Maerki.

Horological Science combines many disciplines, including:

(It is mainly concerned with making better and more accurate timekeepers).

  1. Geometry, incl. escapements:
    1. Aireys 1827 paper to the Cambridge Philosophical society on Escapements Courtesey of David MacMillen
    2. Anchor Escapement (Glasshuette)
    3. Bond's Isodynamic Escapement, a reprint of the 1860 articale in Brunnow's Astronomical notices (courtesey David MacMillen)
    4. Woodwards Double Gravity Escapement (animated)
    5. Earnshaws Chronometer Escapement
    6. Recoil Escapementby Michael Stern, in German, good scetches
    7. Headrick, Mark Clock and Watch Escapement Mechanics A self published book on novel and unconventional ways how to design and construct an escapement with optimal friction characteristics and optimizing escapement angles
    8. Mark Headricks Escapement Geometry simulataions:

      Daniel's Double Wheel Watch Escapement
      Daniel's Coaxial Watch Escapement
      Swiss Lever Watch Escapement
      English Lever Watch Escapement
      Cylinder Watch Escapement
      Duplex Watch Escapement
      Chronometer Clock (or Watch) Escapement
      Graham Clock Escapement
      Recoil Clock Escapement
      Brocot Clock Escapement
      Pin Wheel Clock Escapement
      Gravity Clock Escapement
      Grasshopper Clock Escapement
      A Modified Clock Escapement

    9. Electromagnetic Pedulum after Hipp (Animation half down the page) in German
    10. The geometry of Gear Cutting Tools by John Stevenson
  2. Pendulum Science:
    1. Paul R. Heyl and Guy S. Cook The Value of Gravity at Washington " [PDF file, downloadable (not readable with HTML browser alone) courtesy of Gordon Uber] Use of silica pendulums suspended on knife-edges to determine gravity.
    2. R. M. Fedchenko and A. G. Fleer Spring Suspensions for a Pendulum" 1966, translated. [PDF file, downloadable (not readable with HTML browser alone) courtesy of Gordon Uber]
    3. Analysis of Fedchenko's constant-period (isochronous) clock escapement
    4. Robert A. Nelson and M. G. Olsson The pendulum--Rich physics from a simple system" 1986 article , full text in Adobe PDF format, , downloadable (not readable with HTML browser alone) courtesy of Gordon Uber
    5. Stokes, George G., " On the Effect of the Internal Friction of Fluids on the Motion of Pendulums "; 1850, Cambridge Philosophical Society. Full text in Adobe PDF format, downloadable (not readable with HTML browser alone),, courtesy of Gordon Uber
  3. Friction and Lubcrication Studies
  4. Mathematics
    1. Train wheel Calculations
  5. Materieal Science
    1. Properties of Invar
    2. Leuchtfarben in der UhrentechnikArticle in German on Luminous paint in maerki
  6. Measuring Clock Performance
    1. Instructions for measuring a Watch against Chronometer Standards, courtesy K.Eisenegger
    2. Microset Timerby Brian Mumford
    3. Actual measurments of performance of various precision clocks, Data courtesey of Mumford
    4. The History of Frequency Control and Modern Time Keeping
    5. FREQUENCY CONTROL: Reference and Tutorial Information
    6. Frequency Control - Publications
  7. Online Movement Bank

Here are a few other related subjects of interest:

  1. Horological Science Chapter of the NAWCC
  2. Horological Science Newslettter

Return to Horology home page.
This site maintained by the undersigned as a non-commercial, public resource. Suggestions for additions, corrections and improvements welcome

.Copyright Fortunat F. Mueller-Maerki, horology.com . You can reach me at Horology@horology.com.Reproduction of part or all of the contents of any of these pages is prohibited except to the extent permitted below. These pages may be downloaded onto a hard disk or printed for your personal use provided that you include this copyright notice on each copy and that you make no alterations to any of the pages and do not use any of the pages in any other work or publication in whatever medium stored. No part of the "Horology-The Index" pages may be distributed or copied for any commercial purpose.
Comments allways welcome. Updated Nov 10, 1999 (HS-HSCIE.HTM)

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