HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2016-5 November 2016

PagesContents
2 - 3Comments on Mervyn Hobden's "The Paper by Haine and Millington HSN 2016 – 3" by John Haine & Andrew Millington
4 - 8The Burgess Clock B at Greenwich - some comments by Douglas Bateman
9 - 23The Single Coil Sinusoidal Electromagnetic Escapement (Part 1) by Philip Yates
23 - 28Circular error calculation by Philip Yates

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2016-4 September 2016

PagesContents
2 - 24Investigating the Harrison Pendulum Oscillator – Part 2: Barometric Compensation Methodology by John Haine & Andrew Millington
25 - 42The Paper by Haine and Millington HSN 2016-3 by M.K. Hobden
43 - 56Harrison’s Barometric Compensation - Keeping it Simple: A Description from Practice by Jonathan Betts

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2016-3 July 2016

PagesContents
2 - 18Investigating the Harrison Pendulum Oscillator by John Haine & Andrew Millington

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2016-2 May 2016

PagesContents
2 - 20Introduction to the Lego Astronomical Clock by John Stouffer
21 - 32Smartphone Sensors and Horology by Bob Holmström

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2016-1 January 2016

PagesContents
2 - 13Measuring the Simple Harmonic Motion of a Pendulum by Bryan Mumford and Douglas S. Drumheller
14 - 31Some Thoughts on Pendulum Rod Materials by Philip Yates
32Some comments from Alan Emmerson
32Renewal reminder

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2015-5 December 2015

PagesContents
3 - 10An Experimental Study: Effects of Atmospheric Pressure on the Timing of an Undriven Pendulum by Michel Paquette
11 - 19James Ferguson’s Venus Orrery by Graham White
20 - 23Clock Suspensions: Bessel, Harrison Spring, and Rolling-Knife by Philip Yates

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2015-4 September 2015

PagesContents
2 - 8Comments on Alan Heldman’s Paper in HSN 2015-3 by Steve Thackery
9 - 19Dominion and Dynamic Stability by M. K. Hobden
20Request for articles by Bob Holmström

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2015-3 July 2015

PagesContents
2 - 9Signal and Noise by Robert L. Bellville
10 - 19Comments on Mr. D. Bateman’s Article Regarding Q1, and Mr. M. K. Hobden’s Rebuttal by Bernard Cleyet
20 - 32Thoughts on Reading Tom van Baak’s Paper "Pendulum Accuracy" by Alan Heldman

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2015-2 April 2015

PagesContents
2 - 9Pendulum Accuracy, part 1 – Purity and Quality by Tom van Baak
10 - 20The Harrison Hill Test – Part 5 by M. K. Hobden
21 - 36Tidal Effects on Pendulums at Various Latitudes by Robert L. Belleville

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2015-1 February 2015

PagesContents
2 - 12Symmetric Hand Positions by C. Stuart Kelley
13 - 15Response to Alan Emmerson by Douglas S. Drumheller
16 - 21Antikythera Failure Modes and Effects by Graham White
22 - 28Digital Compensation and Pendulum Clocks by Tom Van Baak

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2014-5 December 2014

PagesContents
2Time to renew – Bob Holmström & David Spong
3 - 8Q by Neville Michie
9 - 11Electronic Pendulum Control: The Final Frontier by Jim Hansen
12Applying the Pendulum Controller by Jim Hansen
13 - 18Harrison Clock Project by Will Matthysen
19 - 27Pendulum Simulation 2: Changing Length or Gravity by Tom Van Baak
28A non horological digression by Bob Holmström

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2014-4 October 2014

PagesContents
2 - 7Harrison and Energy by Alan Emmerson
8 - 10‘Q’ – A Specious Argument by Mervyn Hobden
11 - 15A Difference Equation Gear by Graham White
16Online resources by Bob Holmström

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2014-3 July 2014

PagesContents
2 - 12Anisochronism of John Harrison’s First Sea Clocks, H.1 and H.2 by Douglas S. Drumheller
13 - 17A Skeleton Equation Clock by Graham White
18 - 27A Higher-Powered Pendulum Drive Amplifier by Bob Matthys
28 - 29Comments on Alan Heldman’s Version of History by Douglas S. Drumheller
30 - 32High Q or low Q – A specious argument by Douglas Bateman

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2014-2 May 2014

PagesContents
2 - 3Oh no, not Q again! by John Haine
4 - 8Online Resources of Interest by Bob Holmström
9Introduction to an article by Walter P. White by Bob Holmström
10 - 25A Superior Electric Pendulum; and Some Pendulum Equations by Walter P. White from the Journal of the Optical Society of America 1924
26 - 29CH Féry on a similar escapement to that discussed by Walter P. White – translation by Bob Holmström
30Compound Pendulum Temperature Compensation by Bob Holmström

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2014-1 January 2014

PagesContents
2 - 8The Harrison Hill Test – Part 4 by M. K. Hobden
9 - 11The Unilateral Twin Pivot Grasshopper Escapement by David Heskin
12 - 17Q and the “Grand Mother” Clock continued (Part 3) by Bernard Cleyet
18 - 25Pendulum Simulation 1: Period and Circular Error by Tom Van Baak
26Renewal – New rates

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2013-5 November 2013

PagesContents
2 - 13Oscillator Stability Measurement – M. K. Hobden
14 - 21JOHN HARRISON (Part Three) - J. Harrison and "The Greatest Scientific Problem of His Time" by Alan Heldman
22 - 30A New and Wonderful Pendulum Period Equation by Tom Van Baak
31Answers to Mr. Heldman’s questions about Q on p.4 of HSN 2012-1 by Bernard Cleyet
32Computer Aided Design of Harrison Twin Pivot and Twin Balance Grasshopper Escapement Geometries by David Heskin
33Renewal – New rates

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2013-4 August 2013

PagesContents
2 - 9Type Identification of Epicyclic Fixed-Center Astronomical Gears by Graham White
10 - 11Some Comments on M. K. Hobden’s Findings by Philip Woodward
12 - 18The Longitude Examin’d By “Jeremy Thacker” or Dr. John Arbuthnot? By Wm. F. Ward
19 - 23The Harrison Hill Test – Part 3 By: M. K. Hobden
24 - 30Fedchenko: Clock or Gravimeter? (Tides, part 5) by Tom Van Baak

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2013-3 July 2013

PagesContents
2 - 6An Answer from a Member of the Harrison Research Group by Mervyn K. Hobden
7Response from Peter Hastings
8-26John Harrison (Part Two) by Alan W. Heldman

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2013-2 April 2013

PagesContents
2 - 13Light Sensors and Pendulums by Robert Matthys
14 - 15Response to Alan Heldman HSN 2013-1 by Jonathan Betts
16-29JOHN HARRISON - First Installment by Alan W. Heldman
30 Mathematics of a Clock Escapement by Dr. Eng. Gianni Petrangeli

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2013-1 January 2013

PagesContents
2 - 13The Harrison Hill Test – Part 2 by M. K. Hobden
14 - 29An Exercise in Experimental Horological Archeology - Testing Verge and Foliot Clocks by Malcolm Bell
30Note from Stuart Kelley re Motion of the Simple Pendulum
30 Rock the boat – by Alan Heldman

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2012-5 November 2012

PagesContents
2Renewal + PDF version
3 - 8A Coaxial Equation Gear by Thiout – Graham White
9 - 11Q and the “Grand Mother” Clock continued (Part 2) by Bernard Cleyet
12 - 19 The Harrison Hill Test – Part 1 by M. K. Hobden
20 - 21A Response to Jonathan Betts by John Haine
22 - 262013 Ward Francillon Time Symposium – Pasadena

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2012-4 September 2012

PagesContents
2 - 5Solution of the Barometric Compensation Problem by Douglas S.Drumheller
6 - 12Measuring Amplitude, Velocity and Q by Douglas S. Drumheller
13 - 17 The Influence of Non-linearity on Oscillator Noise for Microwave Synthesis by M. K. Hobden
18 -22The Mass Response, Analytical Analyzed, of a Sinusoidally Driven Linearly Damped Harmonic Oscillator by Bernard Cleyet
23 - 27A Free Pendulum Controller and Analyzer by Jim Hansen
28Computer Aided Design of the Harrison Single Pivot Grasshopper Escapement Geometry by David Heskin
29 - 30Q and balance controlled timekeepers by Jonathan Betts
30Renewal + PDF version announcement

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2012-3 July 2012

PagesContents
2 - 6An Analysis of Q versus Accuracy in Pendulum Clocks by Philip Yates
7 - 8Mechanical Advantage in Harrison’s Late Grasshopper Escapement by Peter Hastings
9 Accuracy vs Q - Reply to Doug Bateman by Jonathan Betts
10 -16Pendulums - Noise, Mass, and Non-Linearity by John Haine
17 - 22Behavior of the Self Excited Oscillator by M. K. Hobden
23 - 29An Elucidation of Three Dissipation Contributions Limiting Pendulum Quality, “Q”, Using a “Grand Mother” Clock by Bernard Cleyet
30Comment on 'Bush-Jackson circular error corrector' in HSN 2009-3 by Hubert Houtman

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2012-2 May 2012

PagesContents
2 - 17The Mercury-Compensated Cylindrical Pendulum by C. Stuart Kelley
18 - 22John Harrison's Escapement Impulse is as Easy as 1,2,3 by David Heskin
23 - 29Comments on Oscillator Mechanics by Douglas S. Drumheller
30Accuracy vs Q - reply to Jonathan Betts by Douglas Bateman
31 - 35Q by Steve Thackery

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2012-1 February 2012

PagesContents
2 - 19Does a clock pendulum have a "sharp resonant peak frequency"? by Alan Heldman
20 - 31Understanding Hybrid Quartz / Pendulum Clocks by Tom Van Baak
32 - 33Comments re recent HSN articles by Jonathan Betts
33Rocking the Boat - Re Circular Error compensation by Dallas Cain
34Rocking the Boat - Next Version of a Scientific Pendulum Drive by Dallas Cain

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2011-5 November 2011

PagesContents
2 - 13'As 3 is to 2' by M.K. Hobden
14 - 21Another Approach for Precision Electronic Pendulum Management by Jim Hansen
22 - 25A More Accurate Temperature Compensation for a Pendulum by Robert Matthys
26HSN Subscription Renewal Notice by David Spong

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2011-4 September 2011

PagesContents
2 - 11Why Does Higher Q Make Better Clocks? by John Haine
12 - 18Comments on John Haine's HSN 11-3 Article and Harrison's Science by M.K. Hobden
19 - 21A Little Mistake by Henry Casson
22 - 23The Direction of the Wood Grain in Harrison's Pallats by Henry Casson
24 - 36Within the Lid of Bürgi's 1590 Table Clock by Graham White

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2011-3 June 2011

PagesContents
2 - 4 A Personal Response to David Heskin’s Article by Peter Hastings
5 - 16 How Big a Kick Should a Healthy Grasshopper Have? by David Heskin
17 - 19David Heskin’s Book – Perfecting the Harrison Single Pivot Grasshopper Escapement by Ken Johnson
20 - 22Response to Mr K Johnson's Article: ‘David Heskin’s Book - Perfecting the Harrison Single Pivot Grasshopper Escapement’ by David Heskin
23 - 24The RAS Grasshopper by Ted Wale
25 - 29A spreadsheet Demo of Brocot’s method by Henry Casson
30In Memoriam: Bill Givens (1948 - 2011)

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2011-2 March 2011

PagesContents
2 - 16How many teeth should a healthy grasshopper have? by David Heskin
17 - 22Some thoughts on 'disturbances to pendulums' by John Haine
23 - 30Precision Free Pendulum Measurement by Digital Delayed Sweep Oscilloscope by H. Houtman

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2011-1 January 2011

PagesContents
2 - 15Parabolic Conical Pendulums, and Some New Cycloidal Pendulums by Hubert Houtman
16 - 25On 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
26 - 27Book Review by Fortunat Mueller-Maerki - The Most Important Clock in America. The David Rittenhouse Astronomical Musical Clock at Drexel University, By Ronald R. Hoppes
28Rittenhouse Equation of Time Mechanism by Bob Holmström
29Important Recent Foucault Pendulum Articles by Bob Holmström
29Correction by R. Matthys
30HSN Subscription Renewal Notice by David Spong

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2010-5 November 2010

PagesContents
2 - 5An Epicyclic Trim Train by Burgi - Graham White
6 - 13Synchronous Oscillations of Asymmetric Coupled Pendulums by John Haine
14Disturbance of Pendulums - Q and energy losses by Douglas Bateman
15 - 18Q, Again by Robert Matthys
19 - 20Comments re Alan Heldman's "Disturbance of Pendula" by Ted Wale
21Horological puzzle by Anthony Prasil
22HSN Subscription Renewal Notice by David Spong

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2010-4 September 2010

PagesContents
2 - 21Disturbance of Pendulums (by impulse and otherwise) by Alan Heldman
22Response to John Haine (HSN 10-3) by Steve Thackery
23 - 29More Observations of a Lifted Pendulum by John Haine
30HSN Subscription Renewal Notice by David Spong

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2010-3 July 2010

PagesContents
2 - 9Q1 by William Scolnik
10 - 15Escapement Error in Intermittently Impulsed Pendulums by John Haine
16 - 30Mainsprings in Barrels - An Experiment by Alsan Emmerson
31 - 32Request for Collaboratin by John Jarvis

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2010-2 April 2010

PagesContents
2 - 12On Leonardo's Lunar-Display Sketches by Graham White
13 - 19Count-Wheels: A Mathematical Problem Arising in Horology
20 - 21Response to Fasoldt suspension question by Mike Everman
22Additional Fasoldt suspension images from Don Saff

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2010-1 January 2010

PagesContents
2 - 14Equations of Motion for the Spring Suspended Pendulum by Alan Emmerson
15 - 25Fabrication of Replidas of the Three-Wheel Clock of Abraham-Louis Breguet by HJ.P.Chollet and M. Jean-Michel Piguet - Translated by John Kirk
26 - 28A Possible Cycloidal Pendulum Support by Ted Wale

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2009-5 November 2009

PagesContents
2 - 15On the Development of a Rod-Less Pendulum Clock by Michael Everman
17 - 20A Dream Pendulum Clock (Tides, part 3) by Tom Van Baak
21 - 24What Changes When Gravity Changes (Tides, part 4) by Tom Van Baak
25What was Fasoldt thinking? by Bob Holmström and Don Saff

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2009-4 August 2009

PagesContents
2 - 19A Bellows Air Pressure Corrector for a Pendulum by Robert Matthys
20 - 25Results of Proportional Digital Drive with #8 Pendulum by Robert L. Belleville
26 - 33Fatigue Failure and Replacement of a Mainspring by Les Pook
34Gulf of California Earthquake of 3 August 2009 by David Walter

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2009-3 June 2009

PagesContents
2 - 25The spring-barrel/fusee/anchor-recoil-escapement pendulum clock as an integrated system with phase-locked negative feedback by Alan W. Heldman
26 - 27Mechanics of a Pendulum - Circular Error Correction - The essentials in a page to set the stage by Dallas Cain
27Rocking the Boat Response "Electronic Measurement of Amplitude of Swing" by Dallas Cain
28 - 29Bush - Jackson Circular Error Corrector by Ned Bigelow
30Rocking the Boat Response - Seasonal Amplitude Variation by Alan Emmerson

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2009-2 April 2009

PagesContents
2 - 32Mainspring Barrel Design by Alan Emmerson
33 - 36Electronic Measurement of the Amplitude of Swing of a Clock Pendulum by Peter Hastings
37 -38Borates for Woodworm Control by Bill Ward
39Response to Seasonal Amplitude Question by Alan Heldman
40Rocking the boat: Circular Error by Dallas Cain

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2009-1 January 2009

PagesContents
2 - 9A Little More by Alan Emmerson
10Comment on "Going Round in Circles" Ned Bigelow
11 - 12A Design for a Precision Centrifugal Governor or More on Conical Pendulums by Ned Bigelow
13 - 20Resonance in Spherical Pendulums by John Haine
21 - 22Salvaging Invar from Discarded CRTs by Bill Ward
22Seasonal Tower Clock Amplitude by Bill Ward

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2008-5 November 2008

PagesContents
2 - 8Pendulum Dynamics and the Advance of Science by Alan Emmerson
9 - 19On 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
20 - 22Pendulum Spring and Flexure Bibliography (update) by Bob Holmström
23 - 25Going Round in (Chaotic) Circles + correction by John Haine
26Review of David Heskin's Sleeping in Oblivion by Colin Ferguson

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2008-4 September 2008

PagesContents
2 - 7A Shortt Lesson in Allan Deviation (Tides, part 2) by Tom Van Baak
8 - 12Period Error During Amplitude Measurement by Andrew Millington
13 - 16Going Round in Circles by Colin Fergusson
17 - 30Suspension Spring Stiffness and Pendulum Mass by Alan Emmerson

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2008-3 July 2008

PagesContents
2 - 10An All-Digital Pendulum Drive Amplifier by Robert Matthys
11 - 23Does the Suspension Spring of a Pendulum Clock Get Stiffer When Bob Mass is Increased by Alan W. Heldman
24 - 25Addition to Antikyhera Revisited by Graham White
26 - 27Derivation of the Period of a Compound Pendulum by John Haine
28Foliot pallet lubrication? by Carlo Croce
28Anti-friction Wheel Pendulum Support? by Bob Holmström

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2008-2 March 2008

PagesContents
2 - 10Calculation of Gear Trains by Approximation translated by John G. Kirk
11 - 16Mr. Heldman's Apparatus, Quantitatively by Bernard Cleyet
17 - 20Explanation of my Watch by Henry Casson
21 - 28Robertson's Bristol Clock by Bob Holmström
29 - 30Question and Response re Houtman article HSN 2007-5
30Text correction for Antikythera Revisited. HSN Issue 2008-1

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2008-1 January 2008

PagesContents
2 - 13A Pin Escapement Model by R.O. Harger
14 - 30Antikythera Revisited by Graham White

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2007-5 October 2007

PagesContents
2 - 19Detent escapements, central-impulse pallets, and servo-remontoires by Hubert Houtman
20 - 26Pecqueur's Memoire on Epicyclic Summing Gears - III - A Review by Arago and De Prony by Graham White
27 - 32Single - Ended Drive of a Double-Pendulum Clock by John Haine
33 - 36Response to Alan Heldman's New Experiment, etc. by Bernard Cleyet

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2007-4 August 2007

PagesContents
2 - 16Mechanics of the Escapement Driven Pendulum by Steve Joseph
17 - 23More on Support Losses and Surprises with a New Experimental Rig by Alan W. Heldman
24Review of a Modern Free (on-line) Book, Strongly Recommended by Alan W. Heldman
25A Dual Pendulum Toy by J.E. (Ned) Bigelow
26 - 27Pendulums and External Vibrations by Robert Matthys
28Postscript to: "Linearity of the Air Pressure's Effect on a Pendulum's Clock Rate" by Robert Matthys
28Comments on "Discussion of Recent Articles on Pendulum Support by Bernard Cleyet" by Paul Hopkins
29 - 30Q Calculation from Time at BDC of a Pendulum (as measured by a photo-gate or similar time detector) by Bernard Cleyet

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2007-3 July 2007

PagesContents
2 - 6A Perspective On Electromagnetic Pendulum Drives by J. E. (Ned) Bigelow
7 - 12Linearity of the Air Pressure's Effect on a Pendulum's Clock Rate By Robert Matthys
13 - 18Pecqueur's Memoire on Epicyclic Summing Gears. II by Graham White
19 - 23Pendulum Support Losses by Alan Emmerson
24 - 27Discussion of Recent Articles on Pendulum Support by Bernard Cleyet
28 - 29A simple maintaining power and roller clutch with click by Henry Casson
30Online horological books by Bob Holmström

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2007-2 April 2007

PagesContents
2Evan Edwards
3 - 12Exploring Buoyancy by Robert L. Belleville
13 - 19Pecqueur's Memoire on Epicyclic Summing Gears - Part 1 by Graham White
20 - 26Pendulum Support Loss: Further Comments in View of Feedback Received (including the "Response" from Alan Emmerson in HSN 2007-1) by Alan Heldman
27Electro-Magnetic Drive correction by Robert Matthys
28Woodward on Time review by Fortunat Mueller-Maerki

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2007-1 January 2007

PagesContents
2 - 14Electro-Magnetic Drive with a More Free Pendulum - Part 2 by Robert Matthys
15 - 25Pendulum Support Loss Measured With a View to Optimal Design and Mounting - Part 2 by Alan W. Heldman
26 - 29Response to Alan Heldman on Pendulum Support Losses by Alan Emmerson
30An Earthquake Observed by Robert L. Belleville

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2006-5 December 2006

PagesContents
2 - 3Ernie Martt
4 - 11Pendulum Support Loss Measured With a View to Optimal Design and Mounting - Part 1 by Alan W. Heldman
12 - 25Electro-Magnetic Drive with a More Free Pendulum - Part 1 by Robert Matthys
26New Book - Woodward on Time

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2006-4 October 2006

PagesContents
2 -9Abbot Richard's Astronomical Gears - Part. II by Graham White
10 - 19Another Look at the Text Behind North's and Bender's Reconstructions of Wallingford's Eclipse Mechanism by David M. MacMillan
20 - 22An Attempt to Make Republican Hours Readable on a French Clock By Carlo G. Croce
23 - 27Musings on a Longcase Mechanical Clock by Paul C. Evans
28 - 29The 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
30Free access to Royal Society of London Archives by Bob Holmström

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2006-3 July 2006

PagesContents
2 - 10Abbot Richard's Astronomical Gears. Part. I by Graham White
11 - 16What I've been up to by Robert Belleville
17 - 20A New Escapement by Bernie Tekippe
21 - 23The Pendulum - A Book review for the Horological Science Newsletter by Norman Heckenberg
24 - 25A Rudimentary Treatise..... by Roger Irving
26Wind Waves and Pendulums by Ned Bigelow

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2006-2 April 2006

PagesContents
2Back issue CD and W5 CD information by Henry Casson
2Correction by Richard Whitehead
3 - 8On Camus' Teeth of Wheels by Graham White
9 - 10The Elliptical Pendulum and a Theorem by Alan Emmerson
11 - 16It's About Time by Alan Emmerson
17 - 19Grimthorpe's Grasshopper? by Henry Casson
20 - 29The 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

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2006-1 January 2006

PagesContents
2 - 8Lunar/Solar Tides and Pendulum Clocks (part 1) by Tom Van Baak
9 - 16Stabilisation of Pendulum Amplitude by Richard Whitehead
17 - 24Lunar Gears in Thomas Mudge's Bracket Clock
25 - 30Comments on the Accuracy of Lunar Gear Trains by John G. Kirk
31 - 34Reply to Alan Emmerson by Hubert Houtman

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2005-5 November 2005

PagesContents
2 - 13Documents Concerning Thomas Mudge's Lunar Gear by Graham White
14Drop of the Weight vs Ticking of the Escapement by Pete Riegel
15 - 16Impulsing of the Shortt free pendulum - Philip Woodward replies to Robert Miles
17 - 18A Dual Pendulum Sequel by Ned Bigelow
18Response to Hubert Houtman's Temporal Analysis of Pendulums by Alan Emmerson

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2005-4 September 2005

PagesContents
2 Good Behavior by Robert Matthys
3 - 14 Temporal Analysis of Pendulums by Hubert Houtman
15 - 19 Mudge's Lunar Gear by Graham White
20 - 25 Christiaan Huygens, the Pendulum and the Cycloid - Author's reply to Comments by Alan Heldman
26 - 27 The Shortt Clock and a Question of Interference by Robert Miles
27 A Query on the Shortt Free Pendulum by Robert Miles
28 Compound Pendulums & Floppy Bobs by Robert Matthys
28 Sunk and Salvaged by Philip Woodward
29 Rock the boat - Meccano Clocks by Les Pook
29 Symposium in Houston
29 New pendulum book

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2005-3 June 2005

PagesContents
2 - 26 Impulsing the Pendulum: Escapement Errors by Dr. George Feinstein
27 - 41 Comments on Alan Emmerson's Huygens Article Plus Some Perhaps-New Ideas About Huygens' Clocks by Alan W. Heldman
42 On Randomness by Alan Emmerson
43 - 44 Fact and fallacy by Philip Woodward

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2005-2 March 2005

PagesContents
2 - 11The Design of Elliptical Pendulums by Hubert Houtman
12 -16The Fallacy About Random Errors by Alan W. Heldman
17 - 21A Dual Pendulum Chronical by Ned Bigelow
22More on Pendulum Drive by Lifting by Ned Bigelow
23 – 24Revision of Appendix C from HSN 2005-1 - Geometry of the Verge and Crown Wheel Escapement by Alan Emmerson

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2005-1 January 2005

PagesContents
2 - 32Things are seldom what they seem - Christiaan Huygens, The Pendulum and the Cycloid by Alan Emmerson

HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2004-5 November 2005

PagesContents
2Symposium comments
3 - 13Gearing of the 1575 Kassel Globe by Graham White
14Floppy Bobs by Steve Thackery
15Flicker noise as the arch enemy by Philip Woodward
16 - 17Floorboard errors of a standing pendulum clock by Philip Woodward
18Figures don't lie by Ned Bigelow
18Another Response to Carlo G. Croce by Snowden Taylor
18A useful online resource for sundial creation by Bob Holmström
19A Light Weight Aerodynamic Pendulum Rod by Alan Heldman
20 - 22Some thoughts on the Littlemore clock by Bryan Mumford