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Accurate Clock Pendulums

Robert J. Matthys

Published in print:
2004
Published Online:
January 2010
ISBN:
9780198529712
eISBN:
9780191712791
Item type:
book
Publisher:
Oxford University Press
DOI:
10.1093/acprof:oso/9780198529712.001.0001
Subject:
Physics, History of Physics

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 ... More


Pendulum rod materials

Robert James Matthys

in Accurate Clock Pendulums

Published in print:
2004
Published Online:
January 2010
ISBN:
9780198529712
eISBN:
9780191712791
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/acprof:oso/9780198529712.003.0021
Subject:
Physics, History of Physics

Over time, several different materials have been used for the pendulum rod such as steel, wood, and invar. The best material is quartz because of its proven stability and low thermal expansion. Steel ... More


Some practical properties of quartz

Robert James Matthys

in Accurate Clock Pendulums

Published in print:
2004
Published Online:
January 2010
ISBN:
9780198529712
eISBN:
9780191712791
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/acprof:oso/9780198529712.003.0006
Subject:
Physics, History of Physics

The big attraction of quartz as a pendulum material is its good dimensional stability over time. Stability over time is the biggest and most needed characteristic in an accurate pendulum. In contrast ... More


Transient temperature effects in a pendulum

Robert James Matthys

in Accurate Clock Pendulums

Published in print:
2004
Published Online:
January 2010
ISBN:
9780198529712
eISBN:
9780191712791
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/acprof:oso/9780198529712.003.0009
Subject:
Physics, History of Physics

This chapter describes some transient temperature measurements made on a pendulum with a quartz pendulum rod. Time offset error occurs because different parts of the pendulum change temperature at ... More


ATOMISTIC ORIGINS OF FRICTION

C. Mathew Mate

in Tribology on the Small Scale: A Bottom Up Approach to Friction, Lubrication, and Wear

Published in print:
2007
Published Online:
January 2008
ISBN:
9780198526780
eISBN:
9780191712098
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/acprof:oso/9780198526780.003.0011
Subject:
Physics, Condensed Matter Physics / Materials

This chapter focuses on current knowledge about how shear strength (the force needed to slide one surface over another) originates at the atomic level. For adhesive friction, friction originates from ... More


Piezoelectric Scanner

C. Julian Chen

in Introduction to Scanning Tunneling Microscopy: Second Edition

Published in print:
2007
Published Online:
September 2007
ISBN:
9780199211500
eISBN:
9780191705991
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/acprof:oso/9780199211500.003.0009
Subject:
Physics, Condensed Matter Physics / Materials

This chapter discusses the physical principle, design, and characterization of piezoelectric scanners, which is the heart of STM and AFM. The concept of piezoelectricity is introduced at the ... More


Fasteners for quartz pendulum rods

Robert James Matthys

in Accurate Clock Pendulums

Published in print:
2004
Published Online:
January 2010
ISBN:
9780198529712
eISBN:
9780191712791
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/acprof:oso/9780198529712.003.0025
Subject:
Physics, History of Physics

This chapter describes five different ways of fastening things to a quartz pendulum rod. To connect to a metal rod, a hole is drilled in it or a thread is cut on it. But how do you fasten something ... More


Unravelling The Mystery of Crystals: The Forerunners

André Authier

in Early Days of X-ray Crystallography

Published in print:
2013
Published Online:
September 2013
ISBN:
9780199659845
eISBN:
9780191748219
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/acprof:oso/9780199659845.003.0011
Subject:
Physics, Crystallography

This chapter recounts the early attempts at guessing the inner structure of crystals. The Ancients thought quartz was the result of the congelation of water. The first to think that the symmetry of ... More


Microstructures and fabrics of granites

Anne Nédélec and Jean-Luc Bouchez

in Granites: Petrology, Structure, Geological Setting, and Metallogeny

Published in print:
2015
Published Online:
April 2015
ISBN:
9780198705611
eISBN:
9780191774515
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/acprof:oso/9780198705611.003.0009
Subject:
Physics, Geophysics, Atmospheric and Environmental Physics

Microstructures in granitic rocks essentially concern quartz grains which deliver key indications on the conditions of deformation of these rocks (magmatic versus high- or low-temperature ... More


The Tyranny of Prehistory and the Search for a Deeper History

Stephen A. Mrozowski

in The Death of Prehistory

Published in print:
2013
Published Online:
March 2015
ISBN:
9780199684595
eISBN:
9780191804816
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/acprof:osobl/9780199684595.003.0011
Subject:
History, Ancient History / Archaeology

This chapter examines the manner in which time is conceptualised within the contexts of prehistory and deeper history. By privileging historical records, it shows how the federal recognition process ... More


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