This list generated 1/6/2004

Books on (or Related to) for Mechanical Timepieces (an ongoing list)

Compiled by Daryl Bender but only with the magnanimous assistance of the following; Dr. David M. MacMillan, Fortunat F. Mueller-Maerki, Robert Miles, Ernest Martt, Bill Scolnik, Tony Roberts, Paul Middents, Bob Holmstrom and where all else was unknown then brief descriptions from the catalogs of Rita Shenton and G.K. Hadfield were used. May they live long and prosper. I take credit for all typos, incorrect spelling etc. Binding, Author Title Publisher Comments Year Pages Height On the Disturbances of A classic paper. The first comprehensive theory on escapements and pendulums. Paper and Balances and on the Theory of Royal Society, Airy, George Biddell given at the Royal society , London 1826, technical and mathematical. Available at 1826 Escapements - Read at the Royal United Kingdom http://www.marcdatabase.com/~lemur/dmh-airy-1826.html Society November 26, 1826 Horologerie et Chronometrie - HB, burgundy, Bailliere, Paris 192 Illustrations, "Contains much information on chronometers. Tends to be Antrades, Jules Grandes encyclopedies industrielles - 1924 582 3/4leather, France advanced and technical, but is an important work." J.B. Bailliere marb, 24cm Les Organes regulants des Magron, Bienne HB, orange, Antrades, Jules 1922 146 Chronometres Switzerland 20cm Supplement #8 to the Bulletin of the NAWCC. A very detailed review of the dead-beat A Review of George Graham's with respect to theory and design. Contains a brief biography, some observations, basic Saddlestapled, Aydlett, Guy D Classic - Dead-Beat by NAWCC 1973 52 geometry, the action, the layout procedure, symbols, the tables, some finer points, some green 23cm. Design practical matters, summary and conclusion, acknowledgements, references and notes. The Square Recoil Escapement - a Author, Rochester Saddlestapled, Aydlett, Guy D 1975 36 special Case NY USA 23cm The Neyenesch "A very idiosyncratic volume (with a lovely embossed cover in this edition). This Barkus, Sarah and HB, black, DJ, Know the Escapement Printers, Inc. San material was later serialized in "The American Horologist and Jeweler" The lever 1943 133 Homer 19cm Diego USA escapement in great detail, with photos of a working model." The Escapements: Their action, Technimedia, History of Watch Production in the Haut Doups department of France with emphasis on HB, green, Belmont, Henry L. 1990 328 construction and proportions Besancon France Cylinder escapement watches (in France), illustrated 28cm CD Rom with excellent quality animated escapements of electrical systems. Highly recommended. Covers Bain, Brillié & Virgreux, Campiche, Carley, Cauderay, Bosco , Leiden Favre-Bulle & Moulin, Froment, Garnier, Gill, Hâtot & Lavet 1, Hâtot & Lavet 2, Hipp, From Bain to Short - elekrische klok The Netherlands, Hope-Jones, H-J & Bowell 1, H-J & Bowell 2, H-J & Bowell 3, Jamin, de Jong, Bosschieter, J. E. 2001 N/A CD ROM systemen BoscoClocks@zonne Lambert, Lowne, Mildé, Murday, Palmer, Parsons, Parsons & Ball, Perret, van de t.nl Planke, Poole, Powers, Rabe & Steinheuer, Reform, Ritchie, Rudd, Shepherd, Shortt, Steinheil, Stroh, Tiffany, Vaucanson, Wagner, Wheatstone. Complete with introduction and background information. In French, "covers the 'scientific' aspects of escapements very well - it is very Bouasse, H. Pendule Spiral Diapason 1920 unfortunate that they are not currently available in English!" Arlington Book The Escapements - Their Action, 1900, 1984 PB, white, Britton, F.J. Company, Arlington 66 Construction and Proportions reprint 21cm Virginia USA

Page 1 of 7 This list generated 1/6/2004 Binding, Author Title Publisher Comments Year Pages Height Part I. There are very excellent perspective and projected drawings. Successive Chapters describe the evolution of the escapement and its development. There are illustrated many obscure types, never adopted. There are essays on the dead-beat-verge escapement, the cylinder, virgule, duplex and variant, spring and pivoted detent, hybrid chronometer-out-of-lever, rack lever, lever etc. The two escapements of Tavan receive detailed attention and are a byway of horological knowledge that is not usually discovered. Two examples of American watchmaking history are shown in the Three- Wheeled Chronometer-Lever and the Jeunet Seconds-beating watch. There are some illustrated notes on Bonniksen's Karrusel watch, and illustrated descriptions of some The Holland Press escapement variants, such as the Breguet cylinder, Double virgule, Robin and Peto X- 1941, 1964, HB, red, DJ, Chamberlain, Paul M It's about 490 - 548 LTD, London UK detent. 1978 22cm Part II is more general, containing notes on the following;: 'Pendule Sympathique'; a history of watch regulating devices; going barrels of many types, and their pre-cursors the stackfreed and the fusee; 'Alarm and Striking Watches'; "Sunrise-Sunset Watch'; 'Raingo's '. Part III is devoted mainly to famous watchmakers. Here and earlier in the book is such a collection of portraits as is found nowhere else. The biographies include; Arnold, Berthoud, Breguet, Caron, Cole, Dent, Derham, Dittisheim, Earnshaw, Ellicott, Facio, Frodsham, Graham, Grossmann, Guillaume, Harrison, Houriet, Howard, Huygens, Jurgensen, Kessels, Kullberg, Le Roy, Lepaute, Mudge, Potter, Sully, Tavan, Tompion, Thuret, Vacheron. "It's really a catalog of the Chamberlain collection but describes many unusual Chamberlain, Paul M Watches escapements with good illustrations." Author, Isle of Man Survey and analysis of geometry and design of the mechanical watch escapement from PB, black, Daniels, George The Practical Watch Escapement 1994 80 UK the verge to the co-axial 26cm Fachkunde für Uhrmacher - Editions Horlogeres, HB, green Defossez, Leopold übersetzt und bearbeitet von M. 1950 270 Biel Switzerland fabric, 30cm Bossart HB, brown Marine Timekeepers of Ferdinand Defossez, Leopold 16 leather 1/2, Berthoud and their Trials at Sea marbled, 26cm Chambre Suisse Théorie Générale de L'Horlogerie - -d'Horlogerie, La In French, "covers the 'scientific' aspects of escapements very well - it is very HB, grey, Defossez, Leopold 1950 316 / 578 Tomme premier, Tomme II Chaux de Fonds unfortunate that they are not currently available in English!" 23cm Switzerland HB, green Spiral Reglant et le Balancier depuis Dittisheim, Paul 1945 117 leather 3/4, Huyens jusqu'a nos jours 27cm The Watch Escapement. Lever and Jadow, New York HB, brown, Fried, Henry B Cylinder. How to analyze, how to Well illustrated. Covers lever and cylinder. 1959 / 1974 164 / 191 USA 22cm / PB adjust, how to repair A classic horological text. Basing the book on a lifetime's experience in the clock and watch-making trade, the author provides detailed instructions for making all types of escapements and for the location and correction of faults. Part 1, Clock Escapements, 1956, 1973, Robert Hale Limited, covers the Verge escapement, the recoil escapement, the dead-beat escapement, the 1975, 1977, HB, black, DJ, Gazeley, W.J. Clock and Watch Escapements 294 / 192 London UK gravity escapement, the chronometer dead-beat escapement and platform escapements. 1980, 1992, 21cm Part 2, Watch Escapements, deals with the verge escapement, the Mudge remontoire 2001 escapement, the cylinder escapement, the virgule escapement, the duplex escapement, the chronometer escapement, the depth tool and polishing.

Page 2 of 7 This list generated 1/6/2004 Binding, Author Title Publisher Comments Year Pages Height 249 plates, octavo, By director of the Nautical School in Lussinpiccolo which is on one of the small northern Adriatic islands this is a very comprehensive and technical treatise. It covers the standard clock and chronometer escapements with detailed drawings including and Urban Jurgenson detent; constant force escapements; quite a A. Hartlesbens Die Uhrmacherkunst und die detailed section on the cylinder. "For those who can read it, this book is crammed full HB, green Gelcich, Eugen Verlag, Wein, Pest, 1892, 1981 636 Behandlung der Präcisionsuhren of interesting and unusual information." In a 1982 catalog he says "A rare classic. One cloth, 19cm Leipzig of the very few books ever to offer watch and clock calipers. Covers all the conventional German Horological School teaching. Very interesting on compensations, escapements, regulator clocks, marine chronometers, magnetism, clock striking and repeating work, calendar work, chronographs alarms, and electrical horology."

An important book by a watchmaker who was famous in his day. Contains practical Watch and Clock Making - Manuals information, now all but forgotten, connected with manufacture and repair. Particularly HB, maroon, Glasgow, David Cassell, London UK 1885, 1897 332 of Technology interesting on marine and pocket chronometer, adjusting rod (including its application 17cm to fusee maintaining springs), springing watches jewelling watches, gilding, etc. 1923, 1956 J.D.Potter London UK, 1960, "A bit specialized, but exceedingly well done - very good hand-drawn plates". Holland The Its 1923, 1960, 287, 287, HB, blue Gould, Ruppert T. 1973 Holland Press, Press reprint is apparently better than the ACC edition. 1989 version has added History and Development 1978, 1989 287, 401 cloth, 23cm 1989 Antique Coll. illustrations. An important contribution to the information on the chronometer. Club 2nd ed. Paris, l'almanach de l'Horlogie et Bijouterie. Important reference book on the more unusual escapements. Chapters include - Echappements á recul pour horologes, Echappements á palettes et roue de rencontre, Echappements ápalettes et rochet, Echappements á ancre á recul - Echappements á recul pour montres, Echappements á roue de rencontre, Mécanisms divers - Echappements mixtes pour horloges et pour Echappements D'Horloges et de (Libraire Générale montres, Echappements á demi-recul, Echappements á recul modéré - Echappements Montres - Expose technique, Scientific et 1913 (2nd Gros, Charles á repos pour horloges, Echappements á ancre de Graham, Echappements áchevilles, 279 descriptif et historique des Industrielle, H. Ed), 1980 Echappements Brocot, Echappements divers - Echappements á repose pour montres, Echappements d'horlogerie. Desforges)?, Paris Mécanismes divers, Echappements á cylindre, Echappements Duplex - Echappements libres pour montres, Echappements á détente, Echappements á ancre, Echappements Robin, Mécanismes divers - Echappements libres pour horloges, Echappements á détente - Echappements á force constante pour horloges, Mécanismes divers - Echappements á force constante pour montres, Mécanismes divers - Le Remontoir d'ég The Detached Lever Escapement - A classic treatise. Is in two volumes, one of text (165pp) and one with illustrations Grossman, Jules A practical and theoretical treatise Geo. K. Hazlett 1867, 1892 188 (20pl). Covers a wide range of lever variants for watches and timepieces Horlogerie Theoretique - Cours de E.Magron, Bienne HB, olive, Grossman, Jules Mechanique Appliquee a la 1911 408, 427 Switzerland 23cm Chronometrie Lessons in Horology - Course in Keystone, HB, black, Grossman, Jules Mechanics as Applied to 1905 263 Philadelphia PA USA 22cm Chronometry - Volume 1 Recently translated 1869, 1880, by Richard Watkins - 1890, 1897, Grossmann, Karl On the construction of a simple and Zipped PDF http://www.hotkey.ne 1903, 46 Moritz mechanically perfect watch file t.au/~watkinsr/gross Translated man.html Aug 2002

Page 3 of 7 This list generated 1/6/2004 Binding, Author Title Publisher Comments Year Pages Height Technical Data on Haldimann Author, Thun folder, blue, Haldimann, Beat Escapement - Illustrations, Patent, 2001 17 Switzerland 29cm Evaluation Clock Escapements, Trains, Motion Saddlestapled, Haswell, J. Eric Works - Horological Technology Tee Publishing, UK 1928, 1999? 24 21cm Series (Reprint) Horology - The Science of Time "If interested in the technicalities of horology this is a book to buy. Good for 1951, 1976 Measurement and the Construction Chapman, London HB, blue, DJ, Haswell, J. Eric escapements, striking work, watch repeating mechanisms, epicyclic trains, (Facsimile 288 of Clocks, Watches and UK 22cm chronometers, electric clocks, etc." Ed.) Chronometers Clock and Watch Escapement Mechanics - To compare various Stapled, taped Headrick, Mark V. mechanical clock and watch Author, USA 1997 87 back, black, escapements with drawings and 28cm computer simulation.

Precision Time Measures their North American Construction and Repair - A Manual Higginbotham, Watch Tool & HB, green, of the Theory and Mechanical Laws 1913, 1952 345 Charles T Supply Co., Chicago 20cm governing the construction of USA timekeeping machines and .. Horology Dept. Modern Methods in Horology - A Bradley HB, black, Hood, Grant book of practical information for 1944 254 Polytechnical 19cm young watchmakers Institute, Peoria, IL An entirely new work reviewing a century of research and achievement in the application of Electricity to Horology (incl. as escapements used here are often different than that used in classical mechanical horology). Chapters include Electric clocks, Alexander Bain, Sir Charles Wheatstone, Synchronization, Speed control of rotary motors from pendulums, Independent self-contained electric Clocks, Hipp and other pendulum propelled clocks, Electrically re-set gravity escapements, transmission of energy through the surfaces of the contact and the half-minute London: N.A.G. propulsion, Electrical impulse dial movements, The momentum Brake - mechanical & 1940, 1949, Hope-Jones, Frank Electrical Timekeeping Press, Ltd London 276 HB, red, 22cm electrical inertia, Gravity escapements; semi detached and detached, The Synchronome 1976 UK detached gravity escapement, Accurate regulation of a pendulum, Free Pendulums, The Synchronome-Shortt free pendulum, the principles of the free pendulum, Circular error, The Free pendulum in time determination; Chronographs, The performance of the free pendulum, Popularizing the free pendulum, Synchronization by circular error, The National Time Service provided by the grid and the regulation of its frequency to average GMT, Synchronous motor clocks, Synchronization from AC mains supply, Timekeeping at sea. Der Chronometergang - Babel Fish Translation, In English: The stop watch course - impact and kinds of the Wirkungsweise und Arten des course, - its historical development, - the construction of the same and their basis, - Ganges, - seine geschichtliche Verlag der Deutschen execution, - treatment and computation of the course. Ill.H.Lwd. Enclosed to test order Irk, Prof. Alois Entwicklung, - die Konstruktion 1923 86 HB Uhrmacher-Zeitung for the apprentice work examination - this is attached and left pressure-pure to the desselben und ihre Grundlage, - angerosteten wire attaching on the resolution sheet with wire. It has 86 sides with 26 Ausführung,- Behandlung und illustrations in the text, as well as in the appendix 2 folded board. Berechnung des Ganges

Page 4 of 7 This list generated 1/6/2004 Binding, Author Title Publisher Comments Year Pages Height The Keystone Watch and Clock Escapements - A complete study in Theory and Practice of the Lever, "A complete study of lever, cylinder, chronometer escapements, history of escapements Cylinder and Chronometer Lindsay Publications, Keystone and practical detail on how 'put in a new cylinder'. Taken from Keystone Escapements 1904 179 PB, tan, 22cm Escapements, together with a brief Bradley IL USA serials" Account of the Origin and Evolution of the Escapement in Horology Electrical Horology - A practical Manual on the application of the Technical Press, Langman, H.R. & principles and practice of electricity HB, red cloth, Kingston Hill Surrey Excellent for this subject. Very wide coverage. 1946 200 Ball, A. to horological Instruments and DJ, 18cm UK Machines for the Measurement and Transmission of Time Charles Rohr "Popular account of Swiss mid 20th century practice with lots of interesting HB, grey cloth Lavest, R The Elements of Watchcraft Editions Horologers, 1946 125 contemporary ads." spine, 21cm Bienne Switzerland The "definitive" book on the Grasshopper escapement. Covers principles, geometry, variants, design & escapement error. In a similar manner the book also covers Harrison roller style gearing and force transmission, his method of pendulum suspension (& The Lost Science of John Brant Wright cycloidal "cheeks"), the effects of heat and cold on a clock and his method of HB, red, DJ, Laycock, William 1976 160 "Longitude" Harrison Associates Ltd. UK temperature compensating (grid-iron) pendulums, The book also covers Harrison's life. 26cm his adaptation of the sciences of music and and discusses building of clocks to Harrison's designs using modern materials and techniques. Excellent, scholarly and informationally "dense"! LeNormand, Janvier L'Horloger Chapter 7 covers a variety of escapements as of 1863 1863? & D. Magnier appears to have been just republished - Farb- und s/w Illustrationen - Size: 21.5 x 30.5 cm, In German, "covers the 'scientific' Monnier, Jeanneret, Theorie der Uhrmacherei von available at aspects of escapements very well - it is very unfortunate that they are not currently 368 Pelaratti Reymondin http://www.watchpri available in English!" nt.com An edition of his writings with Introduction, English Translation, and Commentary., 230mm x 150mm. A massive 3 volume scholarly review of all attributed to Richard of Wallingford. Volume 1 contains the original Latin texts with translations. Volume 2 V1-590, Oxford University maps volume 1 with commentary on the subject matter. Volume 3 maps volume 1 with North, John D Richard of Wallingford 1976 V2-394, HB, dark grey Press diagrams figures and plates. A section of this work covers Richard's astronomical clock V3-328 at St. Albans (one of the first known clocks) of which the time section is believed to have used the strob escapement. The escapement, its form, history and performance are discussed. Author, Bad HB, burgundy, Pahlow, Steffen Touhrbillion - ueber meine Passion 2001 543 Nauheim Germany DJ, 25cm

Watch Escapements - Being the 2nd Paulson, Chicago IL Trans. by S. Paris and ed. by Donald DeCarle. Covers the Lever , pin pallet, cylinder, 1930's (3rd HB, green, Pellaton, Dr. James C Part of a course in Horology for use 125 USA and detent". Ed), 1950 24cm in the Swiss Horological Schools

Page 5 of 7 This list generated 1/6/2004 Binding, Author Title Publisher Comments Year Pages Height Covers action, geometry plus practical information on designing and make pallets/escape wheels as well as fault assessing and repair. Crownwheel & Verge, Mayfield Books, Recoil Anchor, Berthoud's Half-Deadbeat, Tic Tac (Half Beat), Small-Span Pallets, HB, yellow, Penman, Laurie Practical Clock Escapements Mayfield Derbyshire American & Black forest Bent-Strip Pallets, Alternative Methods of Marking Out the 1998 248 DJ, 24cm UK Anchor, Graham Deadbeat, Vulliamy Deadbeat, Brocot, Platform, 400-Day, Pin-Pallet, Pin-Wheel, Gravity, Harrison's Grasshopper Suspensions, Pendulums & finally useful Techniques. Modern Electric Clocks - Principles, "Impulse clocks, Bulle, synchronous, car clocks, Electrically wound clocks, 1933 / 1935 Sir Isaac Pitman & HB, black, DJ, Philpott, Stuart Construction, Installation and synchronized clocks. Turret clocks and chimes. Marie systems. Misc. elec. / 1949 (4th 214 / 228 Sons, London UK 18cm Maintenance Applications. Installation and maintenance." Ed) E.R Gunther, An Analysis of the Lever "A lecture delivered before the Canadian Watchmakers and Jewelers Association Playtner, R.H. Brandtford Ontario 1895 57 Escapement around the turn of the century." Canada Private, St Louis MO Privately printed by author Includes excellent practical advice on Brocot, William Spiralbound, Porter, Robert Pin Pallet Escapements 1987 / 1995 44 USA Gilbert, Seth Thomas A-200 series escapements black, 28cm On the Dynamics, Geometry and Simmonds Precision Spiralbound, Powell, Fred Energy Flow of the Verge Press, Vergennes VT 1981 64 white, 28cm Escapement USA A classic & fundamental reference book on scientific principles as applied to horology. Chapters include Time and its Measurement, Oscillatory Motion, The Pendulum, Dissipation of Energy by a Swinging Pendulum, Escapements and other Impulse The British Devices (combined maintaining and counting escapements), Electric Clocks and Horological Institute 1944 / 1948 Watches (maintaining and counting separated), Escapement Errors (a revised version of 236 / 303 HB, blue / tan Rawlings, AL The Science of Clocks and Watches & Longman Group, / 1993 (3rd theory), Balance-Wheel Clocks and Watches, Isochronism of Balance-Wheel / 393 / purple, 23cm UK Ltd, , Pitman Ed) Movements, The Marine Chronometer, The Four Hundred Day Clock, Gear Trains, USA Weights Mainsprings & their Accessories, Friction & Lubrication, Striking Clocks, Perpetual Calendars, Synchronous Electric and Quartz Clocks, Measurement of Clock Performance. 19 folding plates, Octavo, "Real horology of great importance. Reid's writing has the John Fairbairn, advantage that he was a fine workman himself and also knew some of the great makers. A Treatise on Clock and Watch Edinburgh UK, Others were still within living memory. Every horologist will find something about his Making, Theoretical and Practical - 1826 / 1846 HB, brown 3/4 Reid, Thomas (TEE Publishing has own particular interest; including much about turret clocks, apart from the 459 / 466 Illustrated by Plates - Temous (2nd Ed.) leather, 24cm a reprint, in print, for Smeaton/Ludlam letter re the Greenwich Hospital clock. Reid's spring pallet Imperator Rerum UKP 7.50) escapement, developed for clocks from Mudge's is dealt with and illustrated very fully. Wm. Hardy made a similar escapement about the same time." Charles-André Reymondin, George In French, illustrations couleur et n/b - Size: 21.5 x 30.5 cm, "covers the 'scientific' Monnier, Didier La Théorie de l'Horlogerie aspects of escapements very well - it is very unfortunate that they are not currently Jeanneret & Umberto available in English!" Pelaratti Guide Manuel de l'Horloger - HB, blue traitent des notions de Calcul et de Revue Saunier, Claudius 1847 / 1873 262 / 368 leather, marble Dessin d'Utilite journaliaire pur Chronometrique board, 16cm l'horloger, des methodes … 1861 / Lehrbuch der Uhrmacherei in 1861 / 262, 84, Theorie und Praxis - Atlas / Dritter 1861 / 440, 420, HB, green, Saunier, Claudius Band / Erster Band / Fuenfter Band / Emil Huebner 1869 / 470, 365, 22cm Fuenfter Band / Vierter Band / 1861 / 187, 290 Zweiter Band 1861 / 1861 Page 6 of 7 This list generated 1/6/2004 Binding, Author Title Publisher Comments Year Pages Height Traite des Echappements et des Engrenage - Le resume des Leonce Laget, Paris 1855 / 1978 HB, blue, DJ, Saunier, Claudius principes d'apres lesquelles ils 400 France facsimile 24cm doivent etre etablis et les details d'execusion neces Various editions. It was serialized in French starting in 1861, and in the 1880s 1861 translated into English by Julian Tripplin and Edward Rigg. Monumental, detailed, and (Various Saunier, Claudius Treatise on Modern Horology well worth having. The color plates are quite splendid (in a technical drawing sort of 884 HB other Ed), way). Multiple theories of the verge escapement. 850pp small quarto with twenty 1886, 1978 double-page colored copperplates and many woodcut text illustrations.

Watchmakers' Handbook - Intended Technical Press, 1884 / 1894 HB, maroon / as a Workshop Companion for those Saunier, Claudius London UK / Hazlit, / 1948 (10th 482 / 512 black, 19-21 who are engaged in Watchmaking Chicago USA Ed) cm and the allied Mechanical Les Echappements de Montre - Detailed technical discussion of a wide range of watch escapements (echappements HB, black Tardy, Duclos, M. Ed. chez l'Auteur, Paris 1951-3, recul, spiral, comprensation, demi libres, a ancre, a demi recul a repos a recul, la spiral, la compensation)- photographs, 319 semileather, e.a. France 1988 recule, repos, libres a ancre line drawings and thorough textual description 29cm How to Construct a Scissor CLOCK Meridian Clocks, Spiralbound, Wilding, John 1990 72 and a hand operated grooving tool Petworth UK 30cm A Congreve clock is an unusual clock that keeps time by the rolling of a ball down a zig- Brant Wright zag incline plane. When the ball completes its course the incline plane is tripped and PB, brown, Wilding, John How to Make a Congreve Clock Associates Ltd., 1983 76 tilts the other way causing the ball to roll (zig-zag) in the other direction where the 24cm Ashford Kent UK cycle is repeated. PB / HB, black Brant Wright Covers the construction of a 4 hour running brass model demonstrating Galileo's Wilding, John How to Make Galileo's Escapement 1980 40 buckram, Associates Ltd. famous escapement 25cm The Escapement and Train of American Watches - A practical and Meridian Clocks, "A practical encyclopedic treatise and text book Construction, calculation of number of 1928 (2nd HB, blue, DJ, Wilkinson, T.J. 378 encyclopedic Treatise and Text Petworth UK teeth, testing etc". Ed), 1980s? 24cm Book Practical Lessons on The Lever Keystone, Wilkinson, T.J. Escapement Its Tests, Errors, Their 134 lessons, followed by questions for research work and with a good index of subjects 1916 241+ HB Philadelphia PA USA Detection and Correction A thoroughly new approach - written by mathematical scientist and horologist he describes and discusses work of Huygens, Harrison, Kelvin, Shortt etc as preliminary to My Own Right Time - An Oxford University his own experiences and inventions in his search for the perfect free pendulum. HB, black, DJ, Woodward, Philip 1995 176 Exploration of Clockwork Design Press, Oxford UK Excellent descriptions and explanations of escapement virtues, faults & theory. Covers 25cm gravity escapements, the grasshopper escapement and many "free pendulum" escapements (those that are often used in electrical horology).

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