Buch, Englisch, 280 Seiten, Format (B × H): 196 mm x 256 mm, Gewicht: 733 g
Buch, Englisch, 280 Seiten, Format (B × H): 196 mm x 256 mm, Gewicht: 733 g
ISBN: 978-0-19-852971-2
Verlag: Oxford University Press
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 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 a 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 compared 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.
Autoren/Hrsg.
Fachgebiete
- Technische Wissenschaften Maschinenbau | Werkstoffkunde Technische Mechanik | Werkstoffkunde Materialwissenschaft: Metallische Werkstoffe
- Interdisziplinäres Wissenschaften Wissenschaften Interdisziplinär Zeitmessung: Physikalische und Technische Aspekte
- Technische Wissenschaften Verfahrenstechnik | Chemieingenieurwesen | Biotechnologie Fertigungsverfahren der Uhren und Chronometer
- Technische Wissenschaften Verfahrenstechnik | Chemieingenieurwesen | Biotechnologie Metallurgie
- Naturwissenschaften Physik Physik Allgemein Geschichte der Physik
- Technische Wissenschaften Technik Allgemein Mathematik für Ingenieure
- Naturwissenschaften Physik Mechanik Klassische Mechanik, Newtonsche Mechanik
Weitere Infos & Material
- 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
