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Dr. Nathan Augustus Cobb, technologist of the Dept. of Agric., who has discovered that by the use of a piece of glass he can invoke the aid of the sun in making microscopic studies of minute objects. Until this glass was used, the sun blurred instead of clarified the object
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Dr. Nathan Augustus Cobb, technologist of the Dept. of Agric., who has discovered that by the use of a piece of glass he can invoke the aid of the sun in making microscopic studies of minute objects. Until this glass was used, the sun blurred instead of clarified the object

4 x 5 in. or smaller

Date
1924
Collection
Harris & Ewing
Archive
Library of Congress (via Wikimedia Commons)
Type
photograph
Original size
7,752 × 10,008 pixels

Public domainsafest

Reason: Harris & Ewing collection, given to the Library of Congress without copyright restrictions.

Read from: Commons licence category: PD-Harris-Ewing; no CC BY, CC BY-SA, GFDL or deletion tag on the file page; permission field: No known restrictions on publication. For more information, see Harris & Ewing Photographs - Rights and Restrictions Inf.

Credit line

"Dr. Nathan Augustus Cobb, technologist of the Dept. of Agric., who has discovered that by the use of a piece of glass he can invoke the aid of the sun in making microscopic studies of minute objects. Until this glass was used, the sun blurred instead of clarified the object" (1924). Harris & Ewing. Library of Congress, Prints and Photographs Division, via Wikimedia Commons. Public domain. https://commons.wikimedia.org/wiki/File:Dr._N.A._Cobb,_technologist_of_the_Dept._of_Agric.,_who_has_discovered_that_by_the_use_of_a_piece_of_glass_he_can_invoke_the_aid_of_the_sun_in_making_microscopic_studies_of_minute_objects._LCCN2016893516.jpg

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