Accurate Clock Pendulums

Zusatztext ... this book is an eye-opener ... wealth of information. Robert J. Matthys was a Senior Research Engineer at Honeywell, Inc., from 1952 to 1987. He has spent thirty-seven years designing a wide variety of hardware and instrumentation in the fields of electronics, optics, acoustics, mechanics, and photography. In addition, he has spent nine years designing and testing pendulums of various kinds, along with their electronic drive systems and servos, both pulsed and continuous sine wave. He lives in Minneapolis, Minnesota. Klappentext The Shortt clock! made in the 1920's is the most famous accurate clock pendulum ever known! having an accuracy of one second per year when kept at nearly constant temperature. Almost all of a pendulum clock's accuracy resides in its pendulum. If the pendulum is accurate! the clock will beaccurate. In this book! the author describes many scientific aspects of pendulum design and operation in simple terms with experimental data! and little mathematics. It has been written! looking at all the different parts and aspects of the pendulum in great detail! chapter by chapter! reflectingthe degree of attention necessary for making a pendulum run accurately. The topics covered include the dimensional stability of different pendulum materials! good and poor suspension spring designs! the design of mechanical joints and clamps! effect of quartz on accuracy! temperature compensation! air drag of different bob shapes and making s sinusoidal electromagnetic drive. One whole chapter is devoted to simple ways of improving the accuracy of ordinary low-cost pendulum clocks! which have a different construction to the more expensive designs of substantially well-made ones. This bookwill prove invaluable to anyone who wants to know how to make a more accurate pendulum or pendulum clock. Zusammenfassung Almost all of a pendulum clock's accuracy resides in its pendulum. If the pendulum is accurate, the clock will be accurate. In this book, the author describes how to make a more accurate pendulum or pendulum clock. All scientific aspects of the pendulum design and operation are explained in simple terms and backed up with experimental data....

... this book is an eye-opener ... wealth of information.

Autorentext
Robert J. Matthys was a Senior Research Engineer at Honeywell, Inc., from 1952 to 1987. He has spent thirty-seven years designing a wide variety of hardware and instrumentation in the fields of electronics, optics, acoustics, mechanics, and photography. In addition, he has spent nine years designing and testing pendulums of various kinds, along with their electronic drive systems and servos, both pulsed and continuous sine wave. He lives in Minneapolis, Minnesota.

Klappentext
The Shortt clock, made in the 1920's is the most famous accurate clock pendulum ever known, having an accuracy of one second per year when kept at nearly constant temperature. Almost all of a pendulum clock's accuracy resides in its pendulum. If the pendulum is accurate, the clock will be
accurate. In this book, the author describes many scientific aspects of pendulum design and operation in simple terms with experimental data, and little mathematics. It has been written, looking at all the different parts and aspects of the pendulum in great detail, chapter by chapter, reflecting
the degree of attention necessary for making a pendulum run accurately. The topics covered include the dimensional stability of different pendulum materials, good and poor suspension spring designs, the design of mechanical joints and clamps, effect of quartz on accuracy, temperature compensation,
air drag of different bob shapes and making s sinusoidal electromagnetic drive. One whole chapter is devoted to simple ways of improving the accuracy of ordinary low-cost pendulum clocks, which have a different construction to the more expensive designs of substantially well-made ones. This book
will prove invaluable to anyone who wants to know how to make a more accurate pendulum or pendulum clock.

Zusammenfassung
Almost all of a pendulum clock's accuracy resides in its pendulum. If the pendulum is accurate, the clock will be accurate. In this book, the author describes how to make a more accurate pendulum or pendulum clock. All scientific aspects of the pendulum design and operation are explained in simple terms and backed up with experimental data.

Inhalt
GENERAL; 1. Better accuracy from simple pendulums; 2. A short history of temperature compensation; 3. Scaling the size of a pendulum; 4. Finding a pendulum's axis of rotation; 5. Does a pendulum's axis of rotation shift with amplitude?; 6. Some practical properties of quartz; 7. Putting Q in perspective; 8. The Allan variance and the root mean square time error; 9. Transient temperature effects in a pendulum; 10. Transient response of a pendulum to temperature change; 11. Dimensional stability of pendulum materials; 12. Variations on a Riefler bob shape; 13. Bob shape; 14. Rate adjustment mechanisms; SUSPENSION SPRING; 15. Spring suspensions for accurate pendulums; 16. James' suspension spring equations; 17. Barometric compensation with a crossed spring suspension?; 18. Solid one-piece suspension springs; 19. Stable connections to a suspension spring; 20. Stability of suspension spring materials; PENDULUM ROD; 21. Pendulum rod materials; 22. The heat treatment of invar; 23. The instability of invar; 24. Position sensitivity along the pendulum rod; 25. Fasteners for quartz pendulum rods; 26. Effect of the pendulum rod on Q; AIR AND CLOCK CASE EFFECTS; 27. Correcting the pendulum's air pressure error; 28. Pendulum air movement: a failed experiment; 29. Pendulum air movement: a second try; 30. Time error due to air pressure variations; 31. Effect of the clock case walls on a pendulum; ELECTRONICS; 32. An electronically driven pendulum; 33. Sinusoidal drive of a pendulum; 34. Photoelectronics for pendulums; 35. Check your clock against WWV; 36. Electronic correction for air pressure variations

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