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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


Piezoelectricity

Robert E. Newnham

in Properties of Materials: Anisotropy, Symmetry, Structure

Published in print:
2004
Published Online:
November 2020
ISBN:
9780198520757
eISBN:
9780191916601
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/oso/9780198520757.003.0014
Subject:
Earth Sciences and Geography, Geochemistry

The prefix “piezo” (pronounced pie-ease-o) comes from the Greek word for pressure or mechanical force. Piezoelectricity refers to the linear coupling between ... More


Big Brothers: Internet Shutdowns and Internet.org

Ravi Agrawal

in India Connected: How the Smartphone is Transforming the World's Largest Democracy

Published in print:
2019
Published Online:
November 2020
ISBN:
9780190858650
eISBN:
9780197559857
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/oso/9780190858650.003.0013
Subject:
Computer Science, History of Computer Science

The rat-a-tat of automatic gunfire burst through the morning air in Anantnag. For the locals of this troubled district in the south of Kashmir, it came as ... More


Bonaparte’s Bursting Buttons: A Thin Story

Lars Öhrström

in The Last Alchemist in Paris: And other curious tales from chemistry

Published in print:
2013
Published Online:
November 2020
ISBN:
9780199661091
eISBN:
9780191916885
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/oso/9780199661091.003.0020
Subject:
Chemistry, History of Chemistry

On my way to Vilnius, capital of Lithuania, one late November I realized that I had not packed any winter clothes. It turns out that I was not the first to make this ... More


Bronze Age: Technology, Trade, and Increasing Social Complexity

Mick Atha and Kennis Yip

in Piecing Together Sha Po: Archaeological Investigations and Landscape Reconstruction

Published in print:
2017
Published Online:
May 2017
ISBN:
9789888208982
eISBN:
9789888313952
Item type:
chapter
Publisher:
Hong Kong University Press
DOI:
10.5790/hongkong/9789888208982.003.0005
Subject:
Archaeology, Historical Archaeology

Chapter 5 examines one of Sha Po’s most fascinating and important periods of cultural development, the Bronze Age, a period during which the local community was making wider and more specialised use ... More


The Killer Strikes

Gerrit L. Verschuur

in Impact!: The Threat of Comets and Asteroids

Published in print:
1996
Published Online:
November 2020
ISBN:
9780195101058
eISBN:
9780197561232
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/oso/9780195101058.003.0004
Subject:
Earth Sciences and Geography, Geophysics: Earth Sciences

At the beginning of the nineteenth century, French paleontologist Baron Georges Cuvier recognized that many fossils represented the remains of species that no longer ... More


Making mountains

Jan Zalasiewicz

in The Planet in a Pebble: A journey into Earth's deep history

Published in print:
2010
Published Online:
November 2020
ISBN:
9780199569700
eISBN:
9780191918216
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/oso/9780199569700.003.0017
Subject:
Earth Sciences and Geography, Historical Geology

It has been a quiet 20 million years for the pebble: an interlude, at somewhere around 3–4 kilometres under the sea floor. The rock has still been crystallizing, but ... More


Futures

Jan Zalasiewicz

in The Planet in a Pebble: A journey into Earth's deep history

Published in print:
2010
Published Online:
November 2020
ISBN:
9780199569700
eISBN:
9780191918216
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/oso/9780199569700.003.0019
Subject:
Earth Sciences and Geography, Historical Geology

The pebble is on the beach, once more, unmarked by its brief contact with human sentience. Almost unmarked. The fingerprints that it lightly bears will, however, be ... More


Acoustic waves I

Robert E. Newnham

in Properties of Materials: Anisotropy, Symmetry, Structure

Published in print:
2004
Published Online:
November 2020
ISBN:
9780198520757
eISBN:
9780191916601
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/oso/9780198520757.003.0025
Subject:
Earth Sciences and Geography, Geochemistry

In this chapter we treat plane waves specified by a wave normal and a particle motion vector . Two types of waves, longitudinal waves and shear waves, are observed in ... More


Geomorphology

M. Anwar Maun

in Title Pages

Published in print:
2009
Published Online:
November 2020
ISBN:
9780198570356
eISBN:
9780191916731
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/oso/9780198570356.003.0006
Subject:
Earth Sciences and Geography, Oceanography and Hydrology

Geomorphology is the study of form and structure of sand dunes. Dunes are found in three types of landscapes: sea coasts and lakeshores, river valleys, and arid ... More


Direct characterization of adsorbed surfactant layers

Bob Aveyard

in Surfactants: In Solution, at Interfaces and in Colloidal Dispersions

Published in print:
2019
Published Online:
December 2019
ISBN:
9780198828600
eISBN:
9780191867125
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/oso/9780198828600.003.0008
Subject:
Physics, Condensed Matter Physics / Materials, Soft Matter / Biological Physics

Some widely used techniques for the direct physical investigation of the structure of adsorbed surfactant films are introduced. Neutron reflection has yielded very detailed information about adsorbed ... 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: Physics

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


Atomistic Origins of Friction

C. Mathew Mate and Robert W. Carpick

in Tribology on the Small Scale: A Modern Textbook on Friction, Lubrication, and Wear

Published in print:
2019
Published Online:
October 2019
ISBN:
9780199609802
eISBN:
9780191747724
Item type:
chapter
Publisher:
Oxford University Press
DOI:
10.1093/oso/9780199609802.003.0011
Subject:
Physics, Condensed Matter Physics / Materials, Atomic, Laser, and Optical Physics

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