Fișier:EB1911 - Heliometer - Fig. 11.jpg

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English: EB1911 - Heliometer - Fig. 11, Repsolds completed a new heliometer for Yale College, New Haven, USA. The object-glass is of 6 inch aperture and 98 inch focal length. The mounting, the tube, objective-cell, slides, &c., are all of steel. —from EB1911
Dată
Sursă 1911 Encyclopædia Britannica, vol. 13 pp.224–230, Heliometer article
Autor AnonimUnknown author

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Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:EB1911_-_Heliometer_-_Fig._11.jpg
Public domain This image comes from the Project Gutenberg archives. This is an image that has come from a book or document for which the American copyright has expired and this image is in the public domain in the United States and possibly other countries.

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Public domain This image comes from the 13th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States.

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1 ianuarie 1911Gregorian

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