 Microfilm machines may be available at libraries or record archives. Microfilm is an analog storage medium for books, periodicals, legal documents and engineering drawings. Image File history File linksMetadata Download high resolution version (684x728, 52 KB) File links The following pages link to this file: Microfilm Metadata This file contains additional information, probably added from the digital camera or scanner used to create or digitize it. ...
Image File history File linksMetadata Download high resolution version (684x728, 52 KB) File links The following pages link to this file: Microfilm Metadata This file contains additional information, probably added from the digital camera or scanner used to create or digitize it. ...
Alternative meanings: Library (computer science), Library (biology) Modern-style library In its traditional sense, a library is a collection of books and periodicals. ...
Wiktionary has related dictionary definitions, such as: book A book is a collection of sheets of paper, parchment or other material, bound together along one edge within covers. ...
This article is about the magazine as a published medium. ...
Its most standard form is a roll of black and white 35mm photographic film. Another form, more common for engineering drawings, is a Hollerith punch card that mounts a single exposure. Photography is the process of making pictures by means of the action of light. ...
Herman Hollerith (1860-1929) Herman Hollerith (February 29, 1860 – November 17, 1929) was an American statistician who developed a mechanical tabulator based on punched cards to rapidly tabulate statistics from thousands and millions of data. ...
The punch card (or Hollerith card) is a recording medium for holding information for use by automated data processing machines. ...
Most microfilm media have a digital indexing system exposed on the edge of each image, but these data are not required to use the microfilm, but rather to support automated retrieval systems.
Microfilm is not the most compact analog microform in wide use. Microfiche is more compact. Microfiche is one of the most compact analog storage media in common use. ...
Advantages
The medium has numerous advantages: - First, it is compact, with far smaller storage costs than paper documents. Generally, a year of a periodical in microfilm form takes 10% of the space and 3% of the weight of its paper version.
- Second, it is lower cost than a standard subscription. Most microfilm services get a bulk discount on reproduction rights, and have lower reproduction costs than a comparable amount of printed paper.
- Third, it is a stable archival form. Most library microfilms use polyester with silver-halide dyes in hard gelatin, with an estimated life of 500 years in air-conditioning. In tropical climates with high humidity, fungus eats the gelatin used to hold silver-halide. In the tropics, diazo-based systems with shorter archival lives (20 years) are preferable, because they have polyester or epoxy surfaces.
- Fourth, since it is analog (an actual image of the original data), it is easy to view. Unlike digital media, the data format is instantly comprehensible to persons literate in the language; the only additional equipment that is needed is a simple magnifying glass. This reduces the possibility of obsolescence.
SEM picture of a bend in a high surface area polyester fiber with a seven-lobed cross section Polyester is a category of polymers, or, more specifically condensation polymers, which contain the ester functional group in their main chain. ...
A digital system is one that uses numbers, especially binary numbers, for input, processing, transmission, storage, or display, rather than a continuous spectrum of values (an analog system) or non-numeric symbols such as letters or icons. ...
Disadvantages The medium has numerous disadvantages: - The principal disadvantage of microfilm is that the image is too small to read with the naked eye. Special readers are required to project full-size images on a ground-glass screen or a flat reading surface.
- Hard-copy reproduction: A conventional photocopier cannot reproduce the images and a special combined scanner/printer is required. Libraries using microfilm often have a very limited number of these viewers that can produce a photocopy of an image, for a nominal fee.
- Storage space: Shelf space is required to maintain an efficient archive as well as a safe and secure storage environment.
- Actual reproduction: the microfilm itself can only be reproduced a limited number of times, while digital media regenerate and often include error detection and correction schemes.
A small, much-used Xerox copier in a high school library. ...
Uses Systems that mount microfilm images in punch cards have been widely used for archival storage of engineering information. The punch card (or Hollerith card) is a recording medium for holding information for use by automated data processing machines. ...
For example, when airlines demand archival engineering drawings to support purchased equipment (in case the vendor goes out of business), (as of 1999) they normally specified punch-card-mounted microfilm with an industry-standard indexing system punched into the card. This permits automated reproduction, as well as permitting mechanical card-sorting equipment to sort and select microfilm drawings. A Boeing 747-400 belonging to Virgin Atlantic Airways, one of the UKs largest airlines. ...
1999 (MCMXCIX) was a common year starting on Friday, and was designated the International Year of Older Persons by the United Nations. ...
Hollerith-mounted microfilm is roughly 3% of the size and space of conventional paper or vellum engineering drawings. Some military contracts around 1980 began to specify digital storage of engineering and maintenance data because the expenses were even lower than microfilm, but these programs are now finding it difficult to purchase new readers for the old formats. 1980 (MCMLXXX) was a leap year starting on Tuesday. ...
Microfilm first saw military use during the Franco-Prussian War of 1870-71. During the Siege of Paris, the only way for the provincial government in Tours was by carrier pigeon, and as the pigeons could not carry paper dispatches, the Tours government turned to microfilm. Using a microphotography unit evacuated from Paris before the siege, clerks in Tours photograped paper dispatches and compressed them to microfilm, which were carried by pigeon into Paris and projected by magic lantern while clerks copied the dispatches onto paper. Each pigeon-load of microfilm was capable of containing up to 40,000 microphotographed dispatches. This article or section does not cite its references or sources. ...
The Siege of Paris lasting from September 19, 1870 – January 28, 1871 brought about French defeat in the Franco-Prussian War and led to the establishment of the German Empire. ...
Location within France Tours Cathedral: 15th century Flamboyante Gothic west front with Renaissance pinnacles, 1547 Tours Cathedral. ...
A carrier pigeon is a breed of pigeon (specifically a domesticated Rock Dove, Columba livia) that has wattles, a nearly vertical stature, and that may once have been used to carry messages. ...
The Eiffel Tower, the international symbol of the city, with the skyscrapers of La Défense business district 5 km/ 3 mi behind. ...
The magic lantern or Laterna Magica was the ancestor of the modern slide projector. ...
See also Historical documents are document that contain important information about a person, place, or event. ...
A microfilmer is a machine used by the document management industry to create microfilm. ...
Preservation issues Preservation of Documents and Pictures. ...
ProQuest Company is an Ann Arbor, Michigan based company specializing in microfilm and electronic publishing. ...
External links - The Library of Congress Photoduplication Service
- The Northeast Document Conservation Center
- Heritage Microfilm Preservation Microfilm Specialists
- United Micro Data, Inc.
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