HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2021-5 December 2021
| 2 - 26 | The Robertson Regulator by John Haine |
| 17 - 21 | Looking to confirm with old published experimental data a novel model of Harrison’s Cheeks-and-Ribbon pendulum suspension by Andrea De Marchi |
| 22 -27 | Spectral Analysis of Pendulum clocks (Tides, part 6) by Tom Van Baak | 28 | Time to renew |
HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2021-4 September 2021
| 2 - 7 | Harrison's Cheeks&Ribbon pendulum suspension greatly differs from a flexure-spring by Andrea De Marchi |
| 8 - 24 | Escapement modeling with Working Model 2D by Bob Holmström |
| 24 | The HSN and BHM website is moving! |
HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2021-3 June 2021
| 2 - 16 | How good is Airy? by Andrew Millington |
| 17 - 46 | A New Method for Modelling Escapement Action by Systems Engineering Techniques by J.B. Edwards |
HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2021-2 April 2021
| 2 - 4 | Is there an optimum pendulum amplitude? by John Haine |
| 5 - 22 | State-Transition Modelling of the Grasshopper Escapement by J. B. Edwards |
| 23-26 | How precise are opto-interrupters? By John Haine |
| 27 | A Modern Version of Warren’s Master Clock by A. Prasil |
HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2021-1 February 2021
| 2 - 22 | Clock B – Amplitude Response to Changing Pressure and Temperature by Andrew Millington and John Haine |
| 23 - 25 | Douglas Bateman's "Timekeeping: a Lifetime's Interest in Horology" a Review by Tom Van Baak |
| 26 | Response to Thomas Frank about Feral Clocks by Richard Lamoureux |
| 27 | Duncan Agnew – Data for: Tidal Gravity Variations Measured by a Fedchenko AChF-3 Precise Pendulum Clock |
HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2020-5 November 2020
| 2 - 10 | Measuring and Analysing a new Clock – Part 1 by John Haine |
| 11 - 14 | Domesticating a feral clock, part1 by Thomas Frank |
| 15 - 34 | Airy (et al) v. State-Transition Approaches to Escapement Modeling: An Attempt at Reconciliation by J.B. Edwards |
| 35 | Renewal reminder |
HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2020-4 September 2020
| 1 | Correction to “The Tangent Rule in Practice” by Pepi Cima |
| 2 - 11 | Just How Good was Fedchenko’s Clock? by Duncan Agnew |
| 12 - 29 | Recoil Escapement Modelling by State-Transition by J.B. Edwards |
| 30 - 31 | Postscript by J.B. Edwards |
| 32 | Bob Mathys – Obituary by Tracy Christenson |
HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2020-3 July 2020
| Pages | Contents |
|---|---|
| 2 - 13 | Contact microphone devices for mechanical watches by S. R. Thackery |
| 14 - 28 | Continued Examination of the Tangent Rule and its Development for Rectangular Escapement Pulses by John Edwards |
| 29 - 30 | Comments on JB Edwards paper on mathematical modelling by Douglas Bateman |
| 31 | An Unusual Pendulum and a Plea for Help by Price Russ |
| 32 | Harrison Decoded by Bob Holmström + note from John Edwards |
HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2020-2 May 2020
| Pages | Contents |
|---|---|
| 2 - 20 | Nonlinearity as an essential component in the Modelling of the Assisted Pendulum by J. B. Edwards |
| 21 - 24 | The Tangent Rule in Practice by Pepi Cima |
HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2020-1 February 2020
| Pages | Contents |
|---|---|
| 2 - 7 | Further Historical Performance of Precision Pendulum Clocks by M. K. Hobden |
| 8 - 21 | Verge & Foliot Escapement Experiments by Bob Holmström |
| 22 - 24 | An Electrical Engineer Looks at a Watch – Brief Notes on a Lecture by Prof. Gerald Sussman by David MacMillan |
HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2019-5 December 2019
| Pages | Contents |
|---|---|
| 2 - 9 | A Note on Precision Pendulum Clocks and Allan Deviation by M. K. Hobden |
| 10 - 32 | State-Transition Models for Simulating Nonlinear Horological and Related Systems: Two Case Studies by J. B. Edwards |
HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2019-4 October 2019
| Pages | Contents |
|---|---|
| 2 - 12 | Graham White’s Epicyclic Trilogy Introduction |
| 13 - 25 | Electrically Reset Gravity Escapement Clock by Ian Richardson |
| 26 - 32 | A Polish Precision Clock by Bob Holmström |
HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2019-2 & 3 August 2019
| Pages | Contents |
|---|---|
| 2 | Foreword to three papers on ‘A Role for the Computer in Horological Science’ J. B. Edwards |
| 3 - 24 | #1 - A Role for the Computer in Horological Science? A Case Study in Escapement Theory by J. B Edwards |
| 25 - 42 | #2 - A Role for the Computer in Horological Science? A Case Study in Escapement Theory: Amplitude Considerations by J. B. Edwards |
| 43 - 53 | #3 - A Role for the Computer in Horological Science? A Digest of a Case Study in Escapement Theory by J.B. Edwards |
| 54 - 55 | Appendix 1: State- & Driving- Transition Matrix Elements by J. B. Edwards |
| 46 - 58 | Appendix 2: Improved Euler Approximation for State-Transition Coefficient determination by J.B. Edwards |
HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2019-1 May 2019
| Pages | Contents |
|---|---|
| 2 | The state of HSN by Bob Holmström |
| 3 - 6 | A visit to Father O’Leary’s Clock by Bob Holmström |
| 7 - 27 | Father O’Leary’s Free Pendulum Revised Set Up Instructions by Pierre Boucheron 1991 & 1994 |
| 28 - 32 | Multi-variant Regression Analysis of Horological Data using R by Bob Holmström |
HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2018-5 December 2018
| Pages | Contents |
|---|---|
| 2 - 10 | Another Look at the SH41 Data by Duncan Carr Agnew |
| 11 - 13 | Masters, Servants, Countwheels, and a new Artificial Clockmaker by Duncan Carr Agnew |
| 14 - 27 | A Pendulum Powered by The Earth’s Centrifugal Force Part I: Theory by C. Stuart Kelley |
| 28 | Please note that subscriptions for 2019 are now due by David Spong |
HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2018-4 September 2018
| Pages | Contents |
|---|---|
| 2 - 10 | Clock Hydrodynamics–Part II: Determination of the model constants and comments on Clock B by Douglas S. Drumheller |
| 11 - 12 | Clock XI0 by Douglas S. Drumheller |
| 13 - 26 | Pendulum and sensor experiments – A work in progress by Bob Holmström |
| 28 | Please note that subscriptions for 2019 are now due by David Spong |
HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2018-3 July 2018
| Pages | Contents |
|---|---|
| 2 - 12 | Clock Hydrodynamics–Part I: My Two Clocks & John Harrison’s Tin Whistle by Douglas S. Drumheller |
| 13 - 18 | On Compound Pendulums Suspended From Circular Chops by John Haine and Andrew Millington |
| 19 - 21 | Involute gearing by Henry Casson |
| 22 | Comments from the editor |
HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2018-2 April 2018
| Pages | Contents |
|---|---|
| 2 - 43 | Theory of the Verge & Foliot Clock of the Early Medieval Age By Dieter Roess |
| 44 | Dieter Roess Biography |
HOROLOGICAL SCIENCE NEWSLETTER - NAWCC CHAPTER #161
Issue 2018-1 March 2018
| Pages | Contents |
|---|---|
| 2 - 5 | Mathematics of a Coaxial Watch Escapement, An Introduction for Horological Science Newsletter by Dr. Eng. Gianni Petrangeli |
| 6 - 8 | Philip Woodward Obituary |
| 9 | Graham White Obituary |
| 10 - 11 | Graham White book project |
| 12 | New books Betts - Marine Chronometers - Frumer - Making Time |