bill

151 photos and 1 illustration tagged bill, from 13 members of Flickr Commons.

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110

1863

2026

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The last upload was February 2026.

Here’s a selection of the conversations happening on these photos & illustrations:

TVL1970 said:
This is a photo of the Magellan Monument, alongside Umatac Bay in Umatac, Guam. It marks where Portuguese explorer Ferdinand Magellan landed there in March 1521.

CJ Nye said:
Why so blue?
Smithsonian Institution said:
Smithsonian here. Here's a little more about cyanotypes. You can find more descriptions of phtoographic media in our search- photography.si.edu Cyanotype Sir John Herschel invented the process for printing a cyanotype—more commonly known as a blueprint—in 1842. Creating a cyanotype involved developing prepared paper with an iron-salt solution. After treating the paper with ferric ammonium citrate and potassium ferriyanide, a photographer would place a negative, or even a drawing, on top of it in direct sunlight, causing the exposed parts of the paper to turn bright blue from the effects of the iron. Subsequently submerging the print in water caused the image to become fixed and the unexposed chemicals to wash away, and the iron’s oxidation caused the blue image to intensify. Engineers and architects favored this process for copying drawings because it was stable, efficient, and inexpensive. Thomas Smillie, the Smithsonian’s first photographer, employed this printing method to keep track of his glass-plate negatives. He made and cataloged cyanotypes of each image, after which he stored the corresponding glass-plate negative.
swanq said:
S. P. Langley (who signed this check) was the 3rd Secretary of the Smithsonian (1887-1906) en.wikipedia.org/wiki/Samuel_Pierpont_Langley