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Summary
| Description | Gemma Frisius's 1533 diagram introducing the idea of triangulation into the science of surveying. Having established a baseline, eg the cities of Brussels and Antwerp, the location of other cities, eg Middelburg, can be found by taking its compass direction at each end of the baseline, and plotting where the two directions cross. Note that this was only a theoretical presentation of the concept -- because of hills etc, it is in fact actually impossible to see Middelburg from either Brussels or Antwerp! Nevertheless, the figure soon became well known all across Europe. |
| Date | |
| Source | Libellus de locorum describendorum ratione. This scan found at [1] |
| Author | Gemma Frisius |
![[1]](http://www.math.yorku.ca/SCS/Gallery/images/G-F_triangulation.jpg){kind=link}
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This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 100 years or fewer.  You must also include a United States public domain tag to indicate why this work is in the public domain in the United States.
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| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 16:46, 30 April 2008 | | 272 × 400 (21 KB) | Jheald | {{Information |Description=en:Gemma Frisius's 1533 diagram introducing the idea of en:triangulation into the science of surveying. Having established a baseline, eg the cities of Brussels and Antwerp, the location of other cities, eg Middelberg |
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