ÿþ<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <title>HSN current issue</title> <link rel="stylesheet" href="hsn.css" media="screen" /> <!need to insert stylesheet link for print version here> <!need to insert code for old browsers here> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /> </head> <body> <div id="header"> <img src="images/logo.gif" align="left" height="85"/> <h1>horological science</h1> <h2>current and recent issues</h2> </div> <div id="menu"> <ul> <li><a href="http://www.hsn161.com/HSN/hsn_entry.html">home</a></li> <li><a href="http://www.hsn161.com/HSN/161intro.html">chapter 161</a></li> <li><a href="http://www.hsn161.com/HSN/newsletter.html">newsletter</a></li> <li><a href="http://www.hsn161.com/HSN/literature.html">literature</a></li> <li><a href="http://www.hsn161.com/BHM/bhm1-allusers/bhm_entry.php">bibliographia horologiae mundi</a></li> <li><a href="http://www.hsn161.com/HSN/science.html">pendulum science</a></li> <li><a href="http://www.hsn161.com/HSN/topics.html">horological topics</a></li> <li><a href="http://www.hsn161.com/HSN/credits.html">site credits</a></li> <li><a href="http://www.hsn161.com/HSN/links.html">links</a></li> <li><a href="http://www.hsn161.com/HSN_Admin/hsn_member_home.php">hsn admin</a></li> </ul> </div> <div id="content"> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2011-4 September 2011</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2 - 11</td><td>Why Does Higher Q Make Better Clocks? by John Haine </td></tr> <tr><td>12 - 18</td><td>Comments on John Haine's HSN 11-3 Article and Harrison's Science by M.K. Hobden </td></tr> <tr><td>19 - 21</td><td>A Little Mistake by Henry Casson</td></tr> <tr><td>22 - 23</td><td>The Direction of the Wood Grain in Harrison's Pallats by Henry Casson</td></tr> <tr><td>24 - 36</td><td>Within the Lid of Bürgi's 1590 Table Clock by Graham White</td></tr> </td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2011-3 June 2011</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2 - 4</td><td> A Personal Response to David Heskin s Article by Peter Hastings</td></tr> <tr><td>5 - 16</td><td> How Big a Kick Should a Healthy Grasshopper Have? by David Heskin</td></tr> <tr><td>17 - 19</td><td>David Heskin s Book  Perfecting the Harrison Single Pivot Grasshopper Escapement by Ken Johnson</td></tr> <tr><td>20 - 22</td><td>Response to Mr K Johnson's Article:  David Heskin s Book - Perfecting the Harrison Single Pivot Grasshopper Escapement by David Heskin</td></tr> <tr><td>23 - 24</td><td>The RAS Grasshopper by Ted Wale</td></tr> <tr><td>25 - 29</td><td>A spreadsheet Demo of Brocot s method by Henry Casson</td></tr> <tr><td>30</td><td>In Memoriam: Bill Givens (1948 - 2011)</td></tr> </td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2011-2 March 2011</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2 - 16</td><td>How many teeth should a healthy grasshopper have? by David Heskin</td></tr> <tr><td>17 - 22</td><td>Some thoughts on 'disturbances to pendulums' by John Haine</td></tr> <tr><td>23 - 30</td><td>Precision Free Pendulum Measurement by Digital Delayed Sweep Oscilloscope by H. Houtman</td></tr> </td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2011-1 January 2011</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2 - 15</td><td>Parabolic Conical Pendulums, and Some New Cycloidal Pendulums by Hubert Houtman </td></tr> <tr><td>16 - 25</td><td>On the Correction of a Pendulum for the Reduction to a Vacuum: Together with Remarks on Some Anomalies Observed in Pendulum Experiments By F. Baily - Comments on Knife Edges submitted by R. Matthys</td></tr> <tr><td>26 - 27</td><td>Book Review by Fortunat Mueller-Maerki - The Most Important Clock in America. The David Rittenhouse Astronomical Musical Clock at Drexel University, By Ronald R. Hoppes </td></tr> <tr><td>28</td><td>Rittenhouse Equation of Time Mechanism by Bob Holmström</td></tr> <tr><td>29</td><td>Important Recent Foucault Pendulum Articles by Bob Holmström</td></tr> <tr><td>29</td><td>Correction by R. Matthys</td></tr> <tr><td>30</td><td>HSN Subscription Renewal Notice by David Spong </td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2010-5 November 2010</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2 - 5</td><td>An Epicyclic Trim Train by Burgi - Graham White</td></tr> <tr><td>6 - 13</td><td>Synchronous Oscillations of Asymmetric Coupled Pendulums by John Haine</td></tr> <tr><td>14</td><td>Disturbance of Pendulums - Q and energy losses by Douglas Bateman</td></tr> <tr><td>15 - 18</td><td>Q, Again by Robert Matthys</td></tr> <tr><td>19 - 20</td><td>Comments re Alan Heldman's "Disturbance of Pendula" by Ted Wale</td></tr> <tr><td>21</td><td>Horological puzzle by Anthony Prasil</td></tr> <tr><td>22</td><td>HSN Subscription Renewal Notice by David Spong </td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2010-4 September 2010</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2 - 21</td><td>Disturbance of Pendulums (by impulse and otherwise) by Alan Heldman</td></tr> <tr><td>22</td><td>Response to John Haine (HSN 10-3) by Steve Thackery</td></tr> <tr><td>23 - 29</td><td>More Observations of a Lifted Pendulum by John Haine</td></tr> <tr><td>30</td><td>HSN Subscription Renewal Notice by David Spong </td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2010-3 July 2010</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2 - 9</td><td>Q1 by William Scolnik</td></tr> <tr><td>10 - 15</td><td>Escapement Error in Intermittently Impulsed Pendulums by John Haine</td></tr> <tr><td>16 - 30</td><td>Mainsprings in Barrels - An Experiment by Alsan Emmerson</td></tr> <tr><td>31 - 32</td><td>Request for Collaboratin by John Jarvis </td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2010-2 April 2010</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2 - 12</td><td>On Leonardo's Lunar-Display Sketches by Graham White</td></tr> <tr><td>13 - 19</td><td>Count-Wheels: A Mathematical Problem Arising in Horology</td></tr> <tr><td>20 - 21</td><td>Response to Fasoldt suspension question by Mike Everman</td></tr> <tr><td>22</td><td>Additional Fasoldt suspension images from Don Saff </td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2010-1 January 2010</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2 - 14</td><td>Equations of Motion for the Spring Suspended Pendulum by Alan Emmerson</td></tr> <tr><td>15 - 25</td><td>Fabrication of Replidas of the Three-Wheel Clock of Abraham-Louis Breguet by HJ.P.Chollet and M. Jean-Michel Piguet - Translated by John Kirk</td></tr> <tr><td>26 - 28</td><td>A Possible Cycloidal Pendulum Support by Ted Wale</td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2009-5 November 2009</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2 - 15</td><td>On the Development of a Rod-Less Pendulum Clock by Michael Everman</td></tr> <tr><td>17 - 20</td><td>A Dream Pendulum Clock (Tides, part 3) by Tom Van Baak</td></tr> <tr><td>21 - 24</td><td>What Changes When Gravity Changes (Tides, part 4) by Tom Van Baak</td></tr> <tr><td>25</td><td>What was Fasoldt thinking? by Bob Holmström and Don Saff </td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2009-4 August 2009</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2 - 19</td><td>A Bellows Air Pressure Corrector for a Pendulum by Robert Matthys</td></tr> <tr><td>20 - 25</td><td>Results of Proportional Digital Drive with #8 Pendulum by Robert L. Belleville</td></tr> <tr><td>26 - 33</td><td>Fatigue Failure and Replacement of a Mainspring by Les Pook</td></tr> <tr><td>34</td><td>Gulf of California Earthquake of 3 August 2009 by David Walter </td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2009-3 June 2009</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2 - 25</td><td>The spring-barrel/fusee/anchor-recoil-escapement pendulum clock as an integrated system with phase-locked negative feedback by Alan W. Heldman</td></tr> <tr><td>26 - 27</td><td>Mechanics of a Pendulum - Circular Error Correction - The essentials in a page to set the stage by Dallas Cain</td></tr> <tr><td>27</td><td>Rocking the Boat Response "Electronic Measurement of Amplitude of Swing" by Dallas Cain</td></tr> <tr><td>28 - 29</td><td>Bush - Jackson Circular Error Corrector by Ned Bigelow </td></tr> <tr><td>30</td><td>Rocking the Boat Response - Seasonal Amplitude Variation by Alan Emmerson </td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2009-2 April 2009</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2 - 32</td><td>Mainspring Barrel Design by Alan Emmerson</td></tr> <tr><td>33 - 36</td><td>Electronic Measurement of the Amplitude of Swing of a Clock Pendulum by Peter Hastings</td></tr> <tr><td>37 -38</td><td>Borates for Woodworm Control by Bill Ward</td></tr> <tr><td>39</td><td>Response to Seasonal Amplitude Question by Alan Heldman </td></tr> <tr><td>40</td><td>Rocking the boat: Circular Error by Dallas Cain </td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2009-1 January 2009</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2 - 9</td><td>A Little More by Alan Emmerson</td></tr> <tr><td>10</td><td>Comment on "Going Round in Circles" Ned Bigelow</td></tr> <tr><td>11 - 12</td><td>A Design for a Precision Centrifugal Governor or More on Conical Pendulums by Ned Bigelow</td></tr> <tr><td>13 - 20</td><td>Resonance in Spherical Pendulums by John Haine </td></tr> <tr><td>21 - 22</td><td>Salvaging Invar from Discarded CRTs by Bill Ward </td></tr> <tr><td>22</td><td>Seasonal Tower Clock Amplitude by Bill Ward </td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2008-5 November 2008</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2 - 8</td><td>Pendulum Dynamics and the Advance of Science by Alan Emmerson</td></tr> <tr><td>9 - 19</td><td>On the rules pertaining to the choice of the suspension spring dimensions of a horological regulator by P. Le Rolland - Translated and summarized by Marc-André Lemieux</td></tr> <tr><td>20 - 22</td><td>Pendulum Spring and Flexure Bibliography (update) by Bob Holmström</td></tr> <tr><td>23 - 25</td><td>Going Round in (Chaotic) Circles + correction by John Haine </td></tr> <tr><td>26</td><td>Review of David Heskin's Sleeping in Oblivion by Colin Ferguson </td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2008-4 September 2008</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2 - 7</td><td>A Shortt Lesson in Allan Deviation (Tides, part 2) by Tom Van Baak</td></tr> <tr><td>8 - 12</td><td>Period Error During Amplitude Measurement by Andrew Millington</td></tr> <tr><td>13 - 16</td><td>Going Round in Circles by Colin Fergusson</td></tr> <tr><td>17 - 30</td><td>Suspension Spring Stiffness and Pendulum Mass by Alan Emmerson </td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2008-3 July 2008</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2 - 10</td><td>An All-Digital Pendulum Drive Amplifier by Robert Matthys</td></tr> <tr><td>11 - 23</td><td>Does the Suspension Spring of a Pendulum Clock Get Stiffer When Bob Mass is Increased by Alan W. Heldman</td></tr> <tr><td>24 - 25</td><td>Addition to Antikyhera Revisited by Graham White</td></tr> <tr><td>26 - 27</td><td>Derivation of the Period of a Compound Pendulum by John Haine </td></tr> <tr><td>28</td><td>Foliot pallet lubrication? by Carlo Croce</td></tr> <tr><td>28</td><td>Anti-friction Wheel Pendulum Support? by Bob Holmström</td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2008-2 March 2008</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2 - 10</td><td>Calculation of Gear Trains by Approximation translated by John G. Kirk</td></tr> <tr><td>11 - 16</td><td>Mr. Heldman's Apparatus, Quantitatively by Bernard Cleyet</td></tr> <tr><td>17 - 20</td><td>Explanation of my Watch by Henry Casson</td></tr> <tr><td>21 - 28</td><td>Robertson's Bristol Clock by Bob Holmström </td></tr> <tr><td>29 - 30</td><td>Question and Response re Houtman article HSN 2007-5</td></tr> <tr><td>30</td><td>Text correction for Antikythera Revisited. HSN Issue 2008-1</td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2008-1 January 2008</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2 - 13</td><td>A Pin Escapement Model by R.O. Harger</td></tr> <tr><td>14 - 30</td><td>Antikythera Revisited by Graham White</td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2007-5 October 2007</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2 - 19</td><td>Detent escapements, central-impulse pallets, and servo-remontoires by Hubert Houtman</td></tr> <tr><td>20 - 26</td><td>Pecqueur's Memoire on Epicyclic Summing Gears - III - A Review by Arago and De Prony by Graham White</td></tr> <tr><td>27 - 32</td><td>Single - Ended Drive of a Double-Pendulum Clock by John Haine</td></tr> <tr><td>33 - 36</td><td>Response to Alan Heldman's New Experiment, etc. by Bernard Cleyet</td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2007-4 August 2007</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2 - 16</td><td>Mechanics of the Escapement Driven Pendulum by Steve Joseph</td></tr> <tr><td>17 - 23</td><td>More on Support Losses and Surprises with a New Experimental Rig by Alan W. Heldman</td></tr> <tr><td>24</td><td>Review of a Modern Free (on-line) Book, Strongly Recommended by Alan W. Heldman</td></tr> <tr><td>25</td><td>A Dual Pendulum Toy by J.E. (Ned) Bigelow</td></tr> <tr><td>26 - 27</td><td>Pendulums and External Vibrations by Robert Matthys</td></tr> <tr><td>28</td><td>Postscript to: "Linearity of the Air Pressure's Effect on a Pendulum's Clock Rate" by Robert Matthys</td></tr> <tr><td>28</td><td>Comments on "Discussion of Recent Articles on Pendulum Support by Bernard Cleyet" by Paul Hopkins</td></tr> <tr><td>29 - 30</td><td>Q Calculation from Time at BDC of a Pendulum (as measured by a photo-gate or similar time detector) by Bernard Cleyet</td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2007-3 July 2007</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2 - 6</td><td>A Perspective On Electromagnetic Pendulum Drives by J. E. (Ned) Bigelow</td></tr> <tr><td>7 - 12</td><td>Linearity of the Air Pressure's Effect on a Pendulum's Clock Rate By Robert Matthys</td></tr> <tr><td>13 - 18</td><td>Pecqueur's Memoire on Epicyclic Summing Gears. II by Graham White</td></tr> <tr><td>19 - 23</td><td>Pendulum Support Losses by Alan Emmerson</td></tr> <tr><td>24 - 27</td><td>Discussion of Recent Articles on Pendulum Support by Bernard Cleyet</td></tr> <tr><td>28 - 29</td><td>A simple maintaining power and roller clutch with click by Henry Casson</td></tr> <tr><td>30</td><td>Online horological books by Bob Holmström</td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2007-2 April 2007</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2</td><td>Evan Edwards</td></tr> <tr><td>3 - 12</td><td>Exploring Buoyancy by Robert L. Belleville</td></tr> <tr><td>13 - 19</td><td>Pecqueur's Memoire on Epicyclic Summing Gears - Part 1 by Graham White</td></tr> <tr><td>20 - 26</td><td>Pendulum Support Loss: Further Comments in View of Feedback Received (including the "Response" from Alan Emmerson in HSN 2007-1) by Alan Heldman </td></tr> <tr><td>27</td><td>Electro-Magnetic Drive correction by Robert Matthys</td></tr> <tr><td>28</td><td>Woodward on Time review by Fortunat Mueller-Maerki</td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2007-1 January 2007</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2 - 14</td><td>Electro-Magnetic Drive with a More Free Pendulum - Part 2 by Robert Matthys</td></tr> <tr><td>15 - 25</td><td>Pendulum Support Loss Measured With a View to Optimal Design and Mounting - Part 2 by Alan W. Heldman</td></tr> <tr><td>26 - 29</td><td>Response to Alan Heldman on Pendulum Support Losses by Alan Emmerson</td></tr> <tr><td>30</td><td>An Earthquake Observed by Robert L. Belleville</td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2006-5 December 2006</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2 - 3</td><td>Ernie Martt</td></tr> <tr><td>4 - 11</td><td>Pendulum Support Loss Measured With a View to Optimal Design and Mounting - Part 1 by Alan W. Heldman</td></tr> <tr><td>12 - 25</td><td>Electro-Magnetic Drive with a More Free Pendulum - Part 1 by Robert Matthys</td></tr> <tr><td>26</td><td>New Book - Woodward on Time</td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2006-4 October 2006</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2 -9</td><td>Abbot Richard's Astronomical Gears - Part. II by Graham White</td></tr> <tr><td>10 - 19</td><td>Another Look at the Text Behind North's and Bender's Reconstructions of Wallingford's Eclipse Mechanism by David M. MacMillan</td></tr> <tr><td>20 - 22</td><td>An Attempt to Make Republican Hours Readable on a French Clock By Carlo G. Croce</td></tr> <tr><td>23 - 27</td><td>Musings on a Longcase Mechanical Clock by Paul C. Evans </td></tr> <tr><td>28 - 29</td><td>The Accuracy of Precision Pendulum Clocks - A budding discussion in "Mitteilungen, Deutsche Gesellschaft fuer Chronometie" By Heinrich Pavel (Germany) Contributed and translated by Fortunat Mueller-Maerki</td></tr> <tr><td>30</td><td>Free access to Royal Society of London Archives by Bob Holmström</td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2006-3 July 2006</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2 - 10</td><td>Abbot Richard's Astronomical Gears. Part. I by Graham White</td></tr> <tr><td>11 - 16</td><td>What I've been up to by Robert Belleville</td></tr> <tr><td>17 - 20</td><td>A New Escapement by Bernie Tekippe</td></tr> <tr><td>21 - 23</td><td>The Pendulum - A Book review for the Horological Science Newsletter by Norman Heckenberg</td></tr> <tr><td>24 - 25</td><td>A Rudimentary Treatise..... by Roger Irving</td></tr> <tr><td>26</td><td>Wind Waves and Pendulums by Ned Bigelow</td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2006-2 April 2006</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2</td><td>Back issue CD and W5 CD information by Henry Casson</td></tr> <tr><td>2</td><td>Correction by Richard Whitehead</td></tr> <tr><td>3 - 8</td><td>On Camus' Teeth of Wheels by Graham White</td></tr> <tr><td>9 - 10</td><td>The Elliptical Pendulum and a Theorem by Alan Emmerson</td></tr> <tr><td>11 - 16</td><td>It's About Time by Alan Emmerson</td></tr> <tr><td>17 - 19</td><td>Grimthorpe's Grasshopper? by Henry Casson</td></tr> <tr><td>20 - 29</td><td>The Technology of the Precision Clock Used as a Clockmaker's Regulator by Karl Novak - translated from J. Suisse d'Horlogerie Sep/Oct 1946 by Bradley Ross </td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2006-1 January 2006</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2 - 8</td><td>Lunar/Solar Tides and Pendulum Clocks (part 1) by Tom Van Baak</td></tr> <tr><td>9 - 16</td><td>Stabilisation of Pendulum Amplitude by Richard Whitehead</td></tr> <tr><td>17 - 24</td><td>Lunar Gears in Thomas Mudge's Bracket Clock</td></tr> <tr><td>25 - 30</td><td>Comments on the Accuracy of Lunar Gear Trains by John G. Kirk</td></tr> <tr><td>31 - 34</td><td>Reply to Alan Emmerson by Hubert Houtman</td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2005-5 November 2005</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2 - 13</td><td>Documents Concerning Thomas Mudge's Lunar Gear by Graham White</td></tr> <tr><td>14</td><td>Drop of the Weight vs Ticking of the Escapement by Pete Riegel</td></tr> <tr><td>15 - 16</td><td>Impulsing of the Shortt free pendulum - Philip Woodward replies to Robert Miles</td></tr> <tr><td>17 - 18</td><td>A Dual Pendulum Sequel by Ned Bigelow</td></tr> <tr><td>18</td><td>Response to Hubert Houtman's Temporal Analysis of Pendulums by Alan Emmerson</td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2005-4 September 2005</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2</td><td> Good Behavior by Robert Matthys</td></tr> <tr><td>3 - 14</td><td> Temporal Analysis of Pendulums by Hubert Houtman</td></tr> <tr><td>15 - 19</td><td> Mudge's Lunar Gear by Graham White</td></tr> <tr><td>20 - 25</td><td> Christiaan Huygens, the Pendulum and the Cycloid - Author's reply to Comments by Alan Heldman</td></tr> <tr><td>26 - 27</td><td> The Shortt Clock and a Question of Interference by Robert Miles</td></tr> <tr><td>27</td><td> A Query on the Shortt Free Pendulum by Robert Miles</td></tr> <tr><td>28</td><td> Compound Pendulums & Floppy Bobs by Robert Matthys</td></tr> <tr><td>28</td><td> Sunk and Salvaged by Philip Woodward</td></tr> <tr><td>29</td><td> Rock the boat - Meccano Clocks by Les Pook</td></tr> <tr><td>29</td><td> Symposium in Houston</td></tr> <tr><td>29</td><td> New pendulum book</td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2005-3 June 2005</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2 - 26</td><td> Impulsing the Pendulum: Escapement Errors by Dr. George Feinstein</td></tr> <tr><td>27 - 41</td><td> Comments on Alan Emmerson's Huygens Article Plus Some Perhaps-New Ideas About Huygens' Clocks by Alan W. Heldman</td></tr> <tr><td>42</td><td> On Randomness by Alan Emmerson</td></tr> <tr><td>43 - 44</td><td> Fact and fallacy by Philip Woodward</td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2005-2 March 2005</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2 - 11</td><td>The Design of Elliptical Pendulums by Hubert Houtman</td></tr> <tr><td>12 -16</td><td>The Fallacy About Random Errors by Alan W. Heldman</td></tr> <tr><td>17 - 21</td><td>A Dual Pendulum Chronical by Ned Bigelow</td></tr> <tr><td>22</td><td>More on Pendulum Drive by Lifting by Ned Bigelow</td></tr> <tr><td>23 – 24</td><td>Revision of Appendix C from HSN 2005-1 - Geometry of the Verge and Crown Wheel Escapement by Alan Emmerson</td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2005-1 January 2005</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2 - 32</td><td>Things are seldom what they seem - Christiaan Huygens, The Pendulum and the Cycloid by Alan Emmerson</td></tr> </table> <h2>HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161<br /> Issue 2004-5 November 2005</h2> <table> <tr><th>Pages</th><th>Contents</th></tr> <tr><td>2</td><td>Symposium comments</td></tr> <tr><td>3 - 13</td><td>Gearing of the 1575 Kassel Globe by Graham White</td></tr> <tr><td>14</td><td>Floppy Bobs by Steve Thackery</td></tr> <tr><td>15</td><td>Flicker noise as the arch enemy by Philip Woodward</td></tr> <tr><td>16 - 17</td><td>Floorboard errors of a standing pendulum clock by Philip Woodward</td></tr> <tr><td>18</td><td>Figures don't lie by Ned Bigelow</td></tr> <tr><td>18</td><td>Another Response to Carlo G. Croce by Snowden Taylor</td></tr> <tr><td>18</td><td>A useful online resource for sundial creation by Bob Holmström</td></tr> <tr><td>19</td><td>A Light Weight Aerodynamic Pendulum Rod by Alan Heldman</td></tr> <tr><td>20 - 22</td><td>Some thoughts on the Littlemore clock by Bryan Mumford</td></tr> </table> </div> <div id="footer"> <h3>bob holmström - www.hsn161.com</h3 > </div> </body> </html>