Talk:John Herschel

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[edit] Calendar

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)

[edit] Blueprints

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)