Preview
Preview

The Evolution of the Light and Electron Microscope Essay

:: 1 Works Cited
Length: 1863 words (5.3 double-spaced pages)
Rating: Blue      
Open Document
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Birth of the Light Microscope

In Circa 1000AD the first vision aid was invented (the inventor is unknown) it was called a reading stone. It was described as a glass sphere that magnified reading material when placed on top of an object. Someone picked up a piece of transparent crystal thick in the middle than at the edges, they looked through it, and realized it made objects look bigger. “Magnifying glasses” are mentioned during the first century A.D by Roman philosophers Seneca and Pliny the Elder, but never used much until the invention of spectacles, at the end of the 13th century. The earliest microscope was a simple tube with a plate at one end and a lens at the other, which magnified less than ten times its actual size. They were used to view fleas and tiny creepy things and were then dubbed “flea glasses”.

In Circa 1284 the first wearable eye glasses where invented and credited to Italian, Salvino D’Amate. In about 1590, two Dutch spectacle makers, Zaccharias Janssen and his son Hans discovered while experimenting with the tubes realized that objects appeared greatly enlarged, which ended up the forerunner of the compound microscope and the telescope. In 1609 Galileo, father of modern physics and astronomy, heard of these experiments and figured out the workings of the lenses and made a better device with the ability to focus.

Robert Hooke (1635 - 1703)

Robert Hooke is thought as one of the most neglected natural philosophers of all time. He of amongst other things, the originator of the word ‘cell’ in biology. English physicist looked at a silver of cork through a microscope lens and noticed some “pores” or “cells” in it. He believed the cells had served as containers for the “noble juices” or “fibrou...


... middle of paper ...


...In this microscope the electrons are speeded up in a vacuum until the wavelength is only one hundred thousandth that of white light. The beams of these fast moving electrons are focused on a cell sample and are absorbed or scattered by the cell’s parts to form an image on an electron sensitive photographic plate. The electron microscope can magnify objects up to 1 million times. Nevertheless, the electron microscope does suffer from a serious setback, no living specimen can survive under its high vacuum, and they cannot show the changing movements that characterize a living cell.



References and citing’s by Mary Bellis – inventors.about.com. accessed 25 Jan 2013
http://inventors.about.com/od/mstartinventions/a/microscope.htm
http://www.ucmp.berkeley.edu/history/leeuwenhoek.html
http://www.roberthooke.org.uk/
http://www.microscopy-uk.org.uk/intro/histo.html


Click the button above to view the complete essay, speech, term paper, or research paper








This essay is 100% guaranteed.


Title Length Color Rating  
Essay on The Evolution of the Microscope - ... His microscopes allowed him to be the first pearson to ever see bacteria, yeast plants, the circulation of blood corpuscles in capillaries, and the teeming life in a drop of water. These discovieries is what makes him famous. Leeuwenhoek used his lenses to study both living and nonliving things. Robert Hooke is known as the english father of microscopy. He had reconfirmed Leeuwenhoek's theory of tiny organisms living inside of a drop of water. he had actually taken Leeuwenhoek's design of the microscope and improved it....   [tags: science, magnify, experiment]
:: 3 Works Cited
795 words
(2.3 pages)
Better Essays [preview]
Essay The Evolution of the Microscope - ... Now by 18th century the microscope were better and easier to use they also became more popular to use with in the scientists. Combining two typed of glass made the chromatic effect, which was also one of the important discoveries. During 1830 Joseph Jackson Lister discovered that putting some weak lenses together at a specific distant the result would be getting no blurry image. 1878 Ernst Abbe he formulates a mathematical theory in which led resolution to the wavelength of light. In 1903 Richard Zsigmondy was able to study objects under the wavelength of light with the help of the ultra microscope....   [tags: lenses, atoms, molecules] 527 words
(1.5 pages)
Strong Essays [preview]
Microscope Lab Report Essay - Lab Work Not Included The purpose for completing this lab was to observe how microscopes function. The invention & evolution of the microscope has been an ongoing process since the Middle Ages, when the first convex magnifying lenses were introduced. In 1590, the Jansen Brothers invented the first compound microscope (two or more lenses).However, Antony van Leevenwenhoek created the first “true” microscope, in 1665, with 300x magnification & unbelievable resolution. During the late 1700’s, the microscope was reinvented with 1500x magnification....   [tags: Microscopes] 501 words
(1.4 pages)
Good Essays [preview]
Essay on Comparing the Light and Electron Microscope - Comparing the Light and Electron Microscope In this essay I am going to be comparing the light and electron microscope, I will look at the advantages and disadvantages of each microscope and then analyse my findings to see if one is better than the other. The light, or optical microscope as it is also known was invented in the 17th century, it has been refined in many ways over the years but it is essentially still the same. The light microscope works by; light rays from a light source beneath the stage are through to glass lenses in series....   [tags: Papers] 846 words
(2.4 pages)
Better Essays [preview]
Essay on The Earliest Microscopes and Pond Ecology - ... The revolving nose piece holds two or more objective lenses with different objective power. Many microscopes have Diaphragm or Iris control the intensity and size of light. All these parts in microscope help observe the specimen.                      Pond Ecology is the interaction of life in pond with environment. Pond have low oxygen levels, little animal life, and lack of food supply. A pond contains mostly water, few nutrients, and less aquatic life. Organisms live, grow, and die in the pond....   [tags: electron microscope, environment] 1069 words
(3.1 pages)
Strong Essays [preview]
Essay about Electron Microscope - Electron Microscope An electron microscope has many uses today, mainly to do with scientific study. The electron microscope has been developed to look at the tiniest structures, arrangements and components; it can magnify an object two million times. It works by using electrons instead of light. The electrons can fit through smaller gaps in specimens creating a clearer magnified image. There are two types of electron microscope, a scanning electron microscope and a transmission electron microscope....   [tags: Free Essays] 410 words
(1.2 pages)
Strong Essays [preview]
Electron Microscope Essay - Electron Microscope The electron microscope has become one of the most widely utilized instruments for materials characterization. An electron microscope is a scientific instrument that allows us to “see” objects so small that they cannot be seen in any other way. (CITE) Electron microscopes have allowed scientists to see individual molecules and atoms for the first time. Most microscopes, including those in schools and laboratories today, are optical microscopes. They use glass lenses to enlarge, or magnify, an image....   [tags: science] 857 words
(2.4 pages)
Better Essays [preview]
Scanning Electron Microscope Essay - In the forensic science field there are various machines used to examine physical evidence. One of those instruments is the scanning electron microscope (SEM). This instrument can be used in examining physical evidence found at crime scenes. There have been a number of scientists that have developed and improved the SEM. SEM is very significant in forensics because it can narrow down size, shape, and chemical composition. The scanning electron microscope is always growing and becoming a great impact on forensic science....   [tags: forensic science, evidence]
:: 2 Works Cited
921 words
(2.6 pages)
Better Essays [preview]
Electron Microscopy and the Study of the Cell Essays - Electron Microscopy and the Study of the Cell Electron Microscopes have revolutionised today’s understanding of the cell. In 1838 Scheleiden, a botanist theorised that the basic unit of a plant was a cell, the following year the scientist Schwann came up with a similar hypothesis this time related to animal cells, their combined ideas gave us the cell theory, the idea that all living things were made from similar building blocks, cells. It took 100 years before this idea was confirmed with the invention of the electron microscope....   [tags: Papers] 719 words
(2.1 pages)
Strong Essays [preview]
Essay on Electron Microscopy Investigation - Electron Microscopy Investigation The electron microscope was first made when biologists found a problem with the resolution of a light microscope. Resolution means “the ability to distinguish between two points”; the problem is that the maximum resolution of a light microscope is 200nm. So if two points are closer together than 200nm they are seen as one. One example of this problem is that under a light microscope the centrioles in an animal cell appear as one, however when viewed under an electron microscope we can see that there are two centrioles at right angles to each other....   [tags: Papers] 694 words
(2 pages)
Strong Essays [preview]