Ian Christie
- Published in print:
- 2019
- Published Online:
- September 2020
- ISBN:
- 9780226105628
- eISBN:
- 9780226610115
- Item type:
- chapter
- Publisher:
- University of Chicago Press
- DOI:
- 10.7208/chicago/9780226610115.003.0010
- Subject:
- History, British and Irish Modern History
Paul was establishing his career as an electrical instrument maker when he was drawn into moving pictures in 1894. Despite the rapid growth of the film business from 1896, he maintained his ...
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Paul was establishing his career as an electrical instrument maker when he was drawn into moving pictures in 1894. Despite the rapid growth of the film business from 1896, he maintained his instrument manufacturing and in 1903 secured a lasting success with the Unipivot galvanometer, versions of which continued in production for nearly fifty years. His instruments won medals at major exhibitions in America and Belgium, and he opened an office in New York in 1911. During World War I, he contributed to aircraft height-finding and magnetic mine detection, then merged his company with Cambridge Scientific instruments in 1919, serving on the joint company’s board until his death. Although retired from technical design, he worked with Sir William Bragg in 1934 to create the Bragg-Paul Pulsator, a portable ventilator designed to help sufferers from respiratory illness, which saved many lives during polio and diphtheria outbreaks in the later 1930s.Less
Paul was establishing his career as an electrical instrument maker when he was drawn into moving pictures in 1894. Despite the rapid growth of the film business from 1896, he maintained his instrument manufacturing and in 1903 secured a lasting success with the Unipivot galvanometer, versions of which continued in production for nearly fifty years. His instruments won medals at major exhibitions in America and Belgium, and he opened an office in New York in 1911. During World War I, he contributed to aircraft height-finding and magnetic mine detection, then merged his company with Cambridge Scientific instruments in 1919, serving on the joint company’s board until his death. Although retired from technical design, he worked with Sir William Bragg in 1934 to create the Bragg-Paul Pulsator, a portable ventilator designed to help sufferers from respiratory illness, which saved many lives during polio and diphtheria outbreaks in the later 1930s.
Sarbani Basu and William J. Chaplin
- Published in print:
- 2017
- Published Online:
- May 2018
- ISBN:
- 9780691162928
- eISBN:
- 9781400888207
- Item type:
- chapter
- Publisher:
- Princeton University Press
- DOI:
- 10.23943/princeton/9780691162928.003.0001
- Subject:
- Physics, Particle Physics / Astrophysics / Cosmology
This chapter covers the basics of stellar pulsations, which are the main preoccupation of asteroseismology. Stellar pulsations may be detected by observing the variations of a star's brightness as a ...
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This chapter covers the basics of stellar pulsations, which are the main preoccupation of asteroseismology. Stellar pulsations may be detected by observing the variations of a star's brightness as a function of time. Radial velocity observations are also used in certain cases, though most pulsating stars have been studied using brightness variations. The focus of this chapter (and the book as a whole) is on stars with solar-like pulsations—the small-amplitude oscillations that are continually excited (in a stochastic manner) and damped by turbulence in the outer convection zones of the stars. In addition to a brief history of the study of solar-type oscillations, this chapter also provides an introduction to the basic appearance and properties of the pulsation spectra of solar-like oscillators.Less
This chapter covers the basics of stellar pulsations, which are the main preoccupation of asteroseismology. Stellar pulsations may be detected by observing the variations of a star's brightness as a function of time. Radial velocity observations are also used in certain cases, though most pulsating stars have been studied using brightness variations. The focus of this chapter (and the book as a whole) is on stars with solar-like pulsations—the small-amplitude oscillations that are continually excited (in a stochastic manner) and damped by turbulence in the outer convection zones of the stars. In addition to a brief history of the study of solar-type oscillations, this chapter also provides an introduction to the basic appearance and properties of the pulsation spectra of solar-like oscillators.
