Image:G-F triangulation.jpg

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[edit] 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.
Source

Libellus de locorum de scribendorum ratione. This scan found at [1]
Date

1533
Author

Gemma Frisius
Permission
(Reusing this image)

see below

[edit] Licensing

Public domain This image (or other media file) is in the public domain because its copyright has expired.

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Note that a few countries have copyright terms longer than 70 years: Mexico has 100 years, Colombia has 80 years, and Guatemala and Samoa have 75 years. This image may not be in the public domain in these countries, which moreover do not implement the rule of the shorter term. Côte d'Ivoire has a general copyright term of 99 years and Honduras has 75 years, but they do implement that rule of the shorter term.

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File history

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Date/TimeDimensionsUserComment
current16:46, 30 April 2008272×400 (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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