Essay On Repeater Watches , Horology

Essay on repeater watches By François Crespe Revised Edition Translated and augmented by Richard Watkins Essay on Repeater Watches (revised) By François Crespe Translated and augmented by Richard Watkins Kingston, Tasmania, Australia Published by Richard Watkins December, 2006 © Copyright 2006 Richard P. Watkins Revised March 2007 ISBN 978-0-9581369-8-3 Translated from: François Crespe Essai sur les montres a répétition Geneva, J J Paschoud, 1804. Covers: The cover photographs are of a quarter repeater circa 1790, made by Des Arts & Comp, Geneva. Other translations and books by Richard Watkins: Ferdinand Berthoud and Jacob Auch: How to make a verge watch, (1763 and 1827) 2005 (ISBN 09581369-6-3) (with E.J. Tyler) Jacques David: American and Swiss watchmaking in 1876, reports to the International Committee of Jura Industries on the manufacture of watches in the United States, (1877) 2003 (ISBN 0-9581369-2-0) E. Favre-Perret: Philadelphia Exhibition 1876, report presented to the Federal High Council on the Horology Industry, (1877) 2004 André Francillon: History of Longines preceded by an essay on the Agassiz comptoir, (1947) 2005 (ISBN 0-9581369-7-1) Emile Graupmann: The finishing of the watch case, (1910) 2004 Moritz Grossmann: Prize essay on the construction of a simple and mechanically perfect watch, (1880) 2002 (ISBN 0-9581369-0-4) Bruno Hillmann: The keyless mechanism, a practical treatise on its design and repair, (ca1920) 2004 Jerome Lalande: Jerome Lalande, diary of a trip to England 1763, (1763) 2002 (ISBN 0-9581369-1-2) Societe Suisse de Chronometrie: Some notes on Pierre-Frederic Ingold and the work of E. Haudenschild, (1932), 2004 Richard Watkins: Mechanical Watches, an Annotated Bibliography of Publications since 1800, 2004 (ISBN 0-9581369-5-5) These are available from www.watkinsr.id.au Articles by Richard Watkins: Jacques David—and a Summary of “American and Swiss Watchmaking in 1876” with Emphasis on Interchangeability in Manufacturing, NAWCC Bulletin, No. 350 (June 2004): pp. 294-302. Berthoud, Harrison, and Lalande: A Near Myth, NAWCC Bulletin, No. 359 (December 2005): pp. 773-743. These are also available from www.watkinsr.id.au François Crespe Contents Introduction Preface François Crespe The translation References Action of a verge repeater Continuous motion and discrete states Terminology The basics - the repeater-train The order of striking Counting the hours and quarters Operating the hammers Simple but useless! The all-or-nothing piece The hour-pallet large-hammer lifting pin The star-wheel and jumper The surprise-piece Hand setting The half quarter repeater Alarm mechanisms Alarm with moving dial Alarm with fixed dial Tables of terminology Illustrations Essay on Repeater Watches Preface Plan of the book Definitions Part 1 - Repeater-work Lesson 1 - The origin of horology Lesson 2 - Divisions of clock and watchmakers Lesson 3 - The characteristics of a good watchmaker Lesson 4 - Construction of repeater-work Repeater-work Tracing the calibre Repeater-work frame key-screws The hour-rack, hammers and lifting pallets Springs The silencer The winding-rack and its action with the pulleys The quarter-rack and its pallets The all-or-nothing piece The star-wheel and its action with the jumper The hour-snail The quarter-snail The surprise-piece The quarter-rack spring The fastening spring or dial spring Counter-springs Hardening and straightening pieces Motion work Functioning of the repeater-work. 7 8 8 8 9 10 10 10 10 11 11 12 13 14 14 15 16 18 18 20 20 21 24 26 35 39 39 41 47 47 48 49 51 51 51 52 53 53 54 55 56 57 58 58 59 59 60 60 60 60 61 61 Essay on Repeater Watches Lesson 5 - Half-quarter repeaters and ala