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Divining Your Number of Destiny
INTERPRETATIONS OF THE DESTINY NUMBER Destiny Number 1 A 1's talents include originality, creativity and the ability to launch plans into motion. They have the potential to become very prosperous as a result of applying these skills. Socially or...
Mind Over Matter - Proven
THE ACTS OF CREATION: The following quote is a review I found on Amazon.com for a book I have only read about but seems to confirm many other things. The book is written by a former Chair of Material Sciences at Stanford and I think it fits the...
Taking Back Your Power in Health Care
Taking Back Your Power in Health Care I was dismayed recently to see an article on the front page of the USA Today on the crisis in the cost in health care. Basically, the article was asking, “Who is to blame for the continual upward spiral in...
The future of the Human Species - Part 1: Are we in danger?
The sun, that celestial body which has always fascinated the human species, which differentiates night and day, which when angry, produces the fascinating auroras, is father to us all: humans, animals and plants. The sun is the father of life on...
Your Connection to the Elements
In ancient times, scientists, philosophers and magi divided matter into four basic elements: Air, Fire, Water and Earth. It has been said that these elements are the building blocks of life. A scientist and philosopher named Empedocles set this...
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The History of the Microscope
The first microscope was created hundreds of years ago. In the passing centuries, microscopes evolved into powerful, precise tools that allow scientists to view tiny objects at a level of detail that seems unreal. There are a wide array of available microscopes, from the compound microscopes commonly found in high school science classrooms to powerful scanning tunneling and electron microscopes used by Nobel Prize winners.
Most historians agree that two Dutchman made the first microscope in 1590. Zaccharias Janssen and his son Hans were two eyeglass makers who experimented with putting multiple lenses together in a tube. They found that objects under the tube were greatly enlarged. Over the next hundred years, scientists Robert Hooke, Anton van Leeuwenhoek, and others further refined the work of the Janssens and used microscopes to examine insects, blood, and other items. Scientists have continued microscopes into the present day. Now, microscopes can show tiny particles that are unseen by the naked eye in extremely exact detail.
Microscopes operate on several principles. Most common microscopes have two different lenses. Viewers look through the ocular lens, also known as the eyepiece. There is another lens, called the objective lens at the end of the ocular lens. The objective
lens is a sphere shaped lens located above the stage of the microscope. People place the object they want to examine on the stage and can adjust the lenses to bring the object into focus. Most microscopes have an adjustment knob for coarse focus and one for fine focus. Many microscopes have several objective lenses with different strengths for users to choose from. The lenses are arranged on a circular platform that can be rotated to have the different lenses put into place under the ocular lens. Microscopes also need a light source of some kind underneath the stage. Most commercial microscopes have a light bulb, but many high-end microscopes use lasers or electrons for illumination.
Microscopes have been used to make countless vital scientific discoveries. They are invaluable tools used in a variety of scientific fields that enable researchers to make discoveries that would be impossible with the naked eye.
About the Author
Microscopes Info provides detailed information about electron, compound, stereo, digital, video, and scanning tunneling microscopes, as well as an explanation of the different parts of a microscope, and more. Microscopes Info is affiliated with Business Plans by Growthink.
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| Science/AAAS | Table of Contents: 1 December 2006; 314 (5804) |
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