Accurate clock pendulums / Robert James Matthys.

Format:

Book

Author/Creator:

Matthys, Robert J., 1929-

Language:

English

Subjects (All):

Clock and watch making.

Pendulum.

Physical Description:

1 online resource (274 p.)

Place of Publication:

Oxford ; New York : Oxford University Press, 2004.

Language Note:

English

Summary:

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. - ;The Shortt clock, made in the 1920s, 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 pend

Contents:

Contents; Preface; Introduction; Part I: 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 rms 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 shape14. Rate adjustment mechanisms; Part II: 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 pendulum's suspension spring; 20. Stability of suspension spring materials; Part III: 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 QPart IV: 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; Part V: 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; Conversion Table; Index; A; B; C; H; I; J; L; M; P; Q; R; S; T; W

Notes:

Description based upon print version of record.

Includes bibliographical references and index.

Description based on print version record.

Description based on publisher supplied metadata and other sources.

ISBN:

0-19-151368-7

1-280-84706-9

OCLC:

476258703