If the letters of a book, or any kind of minute object, be regarded through a lesser segment the a ball of glass or crystal, whose aircraft base is laid ~ above them, they will show up far far better and larger.

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--Roger Bacon, Perspectiva 1267

(Source: http://www.orientaltrading.com/, http://upload.wikimedia.org/wikipedia/commons/8/80/Magnifying_glass.jpg, http://www.onlinesciencemall.com/Shop/Control/Product/fp/vpid/1787672/vpcsid/0/SFV/30852, http://antiquescientifica.com/ophthalmic_magnifying_glass_chatelaine_sterling.jpg)

The magnifying glass is situated amongst a organize of various other magnification technologies. The bulk of these innovations share countless optical principles and purposes; special, to photo objects at an raised resolution and magnification than is possible with the person eye with exploitation of the properties of light. The distinguishing feature that the magnifying glass is that structure—a bi-convex lens (one the is convex top top both sides) positioned in a frame and attached come a handle. The lens might be created of glass or plastic, and the handle of materials such as wood, plastic, and also metal. This produces an image of the object behind the lens. Although the magnifying glass has actually been changed over the years v the development of brand-new materials, the straightforward structure remains the identifying attribute of the magnifying glass.

The longevity and consistency that the framework of the magnifying glass end the year has enabled the magnifying glass to end up being iconic. This aesthetic value depends on "the absolute mechanical perfection that the design” follow to Latour (301), a theory echoed through Leroi-Gourhan. Although on a much smaller time scale, a parallel have the right to be drawn between the ax in Leroi-Gourhan"s "Gesture and also Speech" and also the magnifying glass; the ax obtained its ideal kind early in its development, and therefore its structure continued to be relatively consistent over time. The magnifying glass additionally developed early on as a practical technique of magnification and its consistency of form has added to its value as a symbol. A tool whose form is ideally related to its function obtains an aesthetic value, a trend readily observable in the magnifying glass whose type has listed a communication for many other optical tools (see improved Magnifying Capabilities). Magnifying glasses became symbols that intellect and connoisseurship, together is noticeable in arts of the eighteenth century which often depicts magnifying glasses in order to convey knowledge and intellect. Today, virtual images of magnifying glasses space utilized by search engines, indicative the a close check of the internet, and also in magnification tools utilized in imaging software.


The magnifying glasses ~ above an net toolbar

Despite long term maintain of the magnifying glass’s physicality, new structures because that the magnifying glass have actually been emerged as the purpose and also scope that the magnifying glass has changed. Digital magnifying glasses have come to be a necessity, and software such together Zoomify permits the close check of digital images. Historically, the magnifying glass has actually seen vocational usage in textiles, such together thread counters. Today, jewelers and also dentists use creates of magnifying glasses that have become much more technologically advanced over the years. Mass production of plastic magnifiers has allowed for wide-spread utilization in science classrooms. Lighted magnifiers, web page magnifiers, clip magnifiers, in addition to plenty of other creates of magnification, have adjusted the structure of the magnifying glass to specific purposes.

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A 19th Century Textile Magnifier (Source: http://www.liveauctioneers.com/item/2809783alearth.org/)


Jeweler"s Magnifying Glass (Source: http://www.amazon.com/Jewelry-Tool-Loupe-Jewelers-Magnifying/dp/B000P7AQJI)


An neck magnifying glass imaged top top the Powerhouse Museum website v Zoomify software, a type of digital magnifying glass (Source: http://www.powerhousemuseum.com/collection/database/?irn=49001)


A virtual magnifying glass offered to study digital pages that Robert Hooke"s Micrographia (Source: http://archive.nlm.nih.gov/proj/ttp/flash/hooke/hooke.html)

Back to The Basics the the Magnifying Glass

Posted in ~ Dec 05/2008 04:00PM:chris witmore: Nice. Do add in photo credits with web links to your source.