صورة:Cavendish-lab.jpg

Artist's rendition of Henry Cavendish conducting the Cavendish Experiment, which measured the gravitational constant with a torsion balance in 1798. In order to avoid disturbing the delicate apparatus, he set it up in a closed building and performed the experiment from outside, viewing the motion of the torsion balace through the wall with a telescope. The large hole in the wall was added by the artist to show the torsion balance apparatus.

PD-old because of age (Henry Cavendish lived 1731-1810).

This applies to the United States, Canada, the European Union and those countries with a copyright term of life of the author plus 70 years.

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.

 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | +/-