Talk:John Herschel

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The reference for his proposal for leap year correction is in his publication "Outlines of Astronomy" Outlines of Astronomy by John Herschel Dbfirs (talk) 10:35, 7 January 2008 (UTC)

So why didn't you put the reference in the article? Dicklyon (talk) 17:10, 7 January 2008 (UTC)
I fixed it better. Dicklyon (talk) 23:55, 3 October 2009 (UTC)


Cyanotype is not the "precursor to the modern blueprint" process, it is the modern blueprint, unchanged. Dr. Mike Ware created a modified version of cyanotype, called 'New Cyanotype', but as it uses highly toxic chromates, it is not preferred for industrial use. One of the benefits of cyanotype is that it is so harmless, unless, of course, if you heat the undeveloped, dried chemistry, in which case cyanide gas is released.

Juicifer451 (talk) 10:46, 9 June 2008 (UTC)


John Herschel is said to have studied at Eton. Actually, he was only there shortly, leaving after a few months after being bullied. —Preceding unsigned comment added by (talk) 10:14, 15 August 2008 (UTC)

New photos[edit]

I uploaded three new photos of John Herschel by Julia Margaret Cameron, below, including one that's a full version of the current lead image. Feel free to use if useful. Dcoetzee 18:07, 14 October 2009 (UTC)


Herschel is an extremely common German Jewish name. Is it possible he had Jewish ancestry? It is not an impossible assumption, but is it unlikely? (talk) 23:06, 8 March 2010 (UTC) See the article on William, which implies that John Herschel was one quarter. —Preceding unsigned comment added by (talk) 13:47, 24 March 2010 (UTC)

Hundreds of millions of Christians have Jewish ancestry. Is that somehow significant or important? According to Jewish law, it's important only if his mother was Jewish, Otherwise it's just minor fluff and doesn't belong in the article. Santamoly (talk) 06:48, 13 August 2012 (UTC)

File:Julia Margaret Cameron - John Herschel (Metropolitan Museum of Art copy, restored).jpg[edit]

Hello! This is a note to let the editors of this article know that File:Julia Margaret Cameron - John Herschel (Metropolitan Museum of Art copy, restored).jpg will be appearing as picture of the day on March 26, 2014. You can view and edit the POTD blurb at Template:POTD/2014-03-26. If this article needs any attention or maintenance, it would be preferable if that could be done before its appearance on the Main Page. Thanks! — Crisco 1492 (talk) 00:11, 9 March 2014 (UTC)

John Herschel
John Herschel was an English mathematician, astronomer, chemist, inventor, and experimental photographer. He named seven moons of Saturn and four moons of Uranus, invented the cyanotype and actinometer, and wrote extensively on topics including meteorology, physical geography and the telescope.Photograph: Julia Margaret Cameron; restoration: Adam Cuerden

New photos on Commons from the Royal Society Library[edit]

As part of Wikipedia:WikiProject Royal Society a special photo session in the Royal Society Library in London has resulted in Commons:Category:Royal Society Library, with over 50 photos of their treasures, mostly 17th century manuscripts, including several of Herschel's correspondence with Charles Babbage, Charles Blagden's diaries, the 1st edn of Sylva, by John Evelyn, one of the early minute books, Robert Boyle's notebooks etc, the manuscript fair copy of Newton's Principia etc. Please add these as appropriate. Thanks! Wiki at Royal Society John (talk) 22:05, 25 June 2014 (UTC)

Photo on glass[edit]

Due credit for Herschel's 1839 photograph on glass has now been added, my motivation being the increasingly widespread erroneous claim made for Janez Puhar as "the inventor of photography on glass". Googling turns up plenty of references to Herschel's photo, a few nicely illustrated, but a superficial rummaging through them for a suitable cit has proven problematic. Either they're in blog form (albeit institutional blogs), or make the same error as Puhar partisans by calling it the first photo on glass (Niepce and Daguerre had already made some -- Herschel himself mentions one example in an early 1839 letter to Talbot reporting on his visit to Daguerre in Paris), or describe it as a negative (the image is a deposit of metallic silver on the glass and, like a daguerreotype or ambrotype, its appearance as a positive or negative depends on the lighting and background). Can anyone help out by inserting a nice clean cit after one of the commas? AVarchaeologist (talk) 19:03, 2 August 2014 (UTC)