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This is my user-based default OLD sandbox[edit]

This is my old sandbox (called sandbox_old) is old. Go to my default (first) sandbox.

Here is an article about the Sandbox concept of Wikipedia. Petesimon2 (talk) 21:40, 4 November 2013 (UTC)

Editing and adding content to Corpuscular Theory of Light article[edit]

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Introduction[edit]

In optics, the corpuscular theory of light, arguably set forward by Pierre Gassendi and Thomas Hobbes states that light is made up of small discrete particles called "corpuscles" (little particles) which travel in a straight line with a finite velocity and possess impetus. This was based on an alternate description of atomism of the time period.

Mechanical Philosophy[edit]

In the early 17th century, natural philosophers were seeking new information to replace Aristotelianism that had been popular for centuries. Various European philosophers adopted what came to be known as mechanical philosophy sometime between around 1610 to 1650, which described the universe and its contents as a kind of large-scale mechanism, a philosophy that explained the universe ius made with matter and motion [1]. This mechanical philosophy was based on Epicureanism and his atomism, in which everything in the universe including a person's body, mind and soul and event thoughts were made of atoms, infinite number of very small particles of moving matter. During the early part of the 17th century, the atomistic portion mechanical philosophy was largely developed by Gassendi, René Descartes and other atomists.

Pierre Gassendi's atomist matter theory[edit]

The core of Gassendi's philosophy is his atomist matter theory. In his great published work Syntagma Philosophicum, Gassendi tried to explain aspects of matter and natural phenomenon of the world in terms of atoms and the void. He took Epicurean atomism and modified it to be compatible with Christian theology, by suggesting several key changes to it:

  1. God exists
  2. God created a finite number of indivisible and moving atoms
  3. God has a continuing divine relationship to creation (of matter)
  4. Free will‎
  5. a human soul exists

[1] He thought that atoms move in an empty space, classically known as the void which contradicts the Aristotelian view that the universe is fully made of matter. Gassendi also suggests that information gathered by the human senses has a material form, especially in the case of vision. [2]

Corpuscularian theories[edit]

Corpuscularian theories, or corpuscularianism are similar to the theories of atomism, except that in which the case atoms were supposed to be indivisible, corpuscles could in principle be divided. Corpuscles are a single, infinitesimally small, particle which have shape, size and color and other physical properties which alters their function and effect in phenomenon of mechanical or biological sciences. This later lead to the modern idea compounds have secondary properties different than the elements of compounds. Gassendi asserts that corpuscles are particles that carry other substance or substances and are of different types. These corpuscles are also emissions from various sources such as solar entities, animals or plants. Robert Boyle was a strong proponent of corpuscularianism by using the theory to exemplify the differences between a vacuum and a plenum, which he aimed to further support his mechanical philosophy and overall atomist theory.[2] About a half-century after Gassendi, Isaac Newton used existing corpuscularian theories to develop his particle theory of the physics of light.[3]

Corpuscularian theory to describe light[edit]

File:Sir Isaac Newton and Christiaan Huygens, Pioneers in Visible Light Physics.png
Pioneers in Visible Light Physics

Isaac Newton argued that the geometric nature of reflection and refraction of light could only be explained if light was made of particles, referred to as corpuscles, because waves do not tend to travel in straight lines. Newton sought to prove Christiaan Huygens' theory that light was made of waves. In his 44th trial in a series of experiments concerning physics of light, he concluded that light is made of particles and not waves by having passed a beam of white light through two prisms which were held at such an angle that the light split into a spectrum after passing through the first prism and then was recomposed, back into white light, by the second prism.

Sir Isaac Newton[edit]

File:Physics Newton's corpuscular theory of light Science eLearnin youtube video.jpg
Corpuscular light traveling to the human eye
File:Reflection of light explained by both the particle and wave theories.jpg
Reflection of light explained by both the particle and wave theories

It was largely developed by Sir Isaac Newton. Newton's theory remained in force for more than 100 years and took precedence over Huygens' wave front theory, partly because of Newton’s great prestige. When the corpuscular theory failed to adequately explain the diffraction, interference and polarization of light it was abandoned in favour of Huygens' wave theory.[4] To some extent, Newton's corpuscular(particle) theory of light re-emerged in the 20th century, as light phenomenon is currently explained as particle and wave.

Newton's corpuscular theory was an elaboration of his view of reality as interactions of material points through forces. Note Albert Einstein's description of Newton's conception of physical reality:

[Newton's] physical reality is characterised by concepts of space, time, the material point and force (interaction between material points). Physical events are to be thought of as movements according to law of material points in space. The material point is the only representative of reality in so far as it is subject to change. The concept of the material point is obviously due to observable bodies; one conceived of the material point on the analogy of movable bodies by omitting characteristics of extension, form, spatial locality, and all their 'inner' qualities, retaining only inertia, translation, and the additional concept of force.[5][6]

  1. Every source of light emits large numbers of tiny particles known as corpuscles in a medium surrounding the source.
  2. These corpuscles are perfectly elastic, rigid, and weightless.[7]

See also[edit]

References[edit]

  1. ^ a b WorldCat.org permalink Reconfiguring the World: Nature, God, and Human Understanding from the Middle Ages to Early Modern Europe. Osler, Margaret J. Baltimore; Maryland, U.S. : The Johns Hopkins University Press. 2010. pp 78-82, pp 84-86.
  2. ^ a b plato.standford.edu Stanford Encyclopedia of Philosophy: Pierre Gassendi. Fisher, Saul. 2009.
  3. ^ virgina.edu Newton's Particle Theory of Light Lecture notes. Lindgren, Richard A. Research Professor of Physics. University of Virginia, Department of Physics.
  4. ^ bartleby.com - The Wave, Particle, and Electromagnetic Theories of Light
  5. ^ Maxwell's Influence on the Development of the Conception of Physical reality (Sonja Bargmann's 1954 Eng. Translation), an appreciation by Albert Einstein, pp.29-32, The Dynamical Theory of the Electromagnetic Field (1865), James Clerk Maxwell, edited by Thomas F. Torrance (1982); Eugene, Oregon: Wipf and Stock Publishers, 1996
  6. ^ Maxwell's influence on the development of the conception of physical reality , Albert Einstein, in James Clerk Maxwell : A Commemorative Volume 1831-1931 (Cambridge, 1931), pp. 66-73
  7. ^ gutenberg.org Opticks, or, a Treatise of the Reflections, Refractions, Inflections, and Colours of Light. Sir Isaac Newton. 1704. Project Gutenberg ebook, released 23 August 2010.

External links[edit]

Category:History of physics Category:Obsolete scientific theories Category:Isaac Newton Category:Natural_philosophy

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Editing and adding content to Astra A-60 article[edit]

Astra A-60
TypeSemi-automatic pistol
Place of originSpain
Service history
In serviceSpanish Armed Forces
Used bySpanish Military
Production history
ManufacturerAstra-Unceta y Cia SA
Specifications
Mass[convert: needs a number]
Length6.5 in (170 mm)
Barrel length96.5 mm (3.80 in)
Cartridge
ActionStraight Blowback
Feed systemDetachable box magazine: 13 (.380 ACP), 12 (7.65mm Browning, .32 ACP)
SightsFixed front, adjustable rear.

The Astra A-60 is a double-action, semi-automatic pistol at one time produced in Spain by Astra-Unceta y Cia SA. The design is similar to the Walther PP and features a decocking lever.

See Also[edit]

Service Pistol

photograph of right side of an Astra A-60 semi-automatic pistol firearm

Notes[edit]

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Category:Semi-automatic pistols Category:Semi-automatic pistols of Spain Category:.380 ACP firearms Category:.32 ACP firearms Category:7.65mm Browning firearms

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