Accurate Clock Pendulums
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70 854 Ft
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Product details:
- Publisher OUP Oxford
- Date of Publication 3 June 2004
- ISBN 9780198529712
- Binding Hardback
- No. of pages280 pages
- Size 256x196x19 mm
- Weight 733 g
- Language English
- Illustrations numerous halftones & line drawings 0
Categories
Short description:
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.
MoreLong description:
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.
... a much-needed 'materials and methods' handbook ... It gives the reader a staggering amount of factual details on materials, methods, and the results of scrupulous experiments.
Table of Contents:
General
Better accuracy from simple pendulums
A short history of temperature compensation
Scaling the size of a pendulum
Finding a pendulum's axis of rotation
Does a pendulum's axis of rotation shift with amplitude?
Some practical properties of quartz
Putting Q in perspective
The Allan variance and the root mean square time error
Transient temperature effects in a pendulum
Transient response of a pendulum to temperature change
Dimensional stability of pendulum materials
Variations on a Riefler bob shape
Bob shape
Rate adjustment mechanisms
Suspension spring
Spring suspensions for accurate pendulums
James' suspension spring equations
Barometric compensation with a crossed spring suspension?
Solid one-piece suspension springs
Stable connections to a suspension spring
Stability of suspension spring materials
Pendulum rod
Pendulum rod materials
The heat treatment of invar
The instability of invar
Position sensitivity along the pendulum rod
Fasteners for quartz pendulum rods
Effect of the pendulum rod on Q
Air and clock case effects
Correcting the pendulum's air pressure error
Pendulum air movement: a failed experiment
Pendulum air movement: a second try
Time error due to air pressure variations
Effect of the clock case walls on a pendulum
Electronics
An electronically driven pendulum
Sinusoidal drive of a pendulum
Photoelectronics for pendulums
Check your clock against WWV
Electronic correction for air pressure variations
