Paper, 'Problema alhasein' [alhasein problem] by Christian Huygens at Paris
Reference number: CLP/1/13
Date: 26 June 1669
On the ibn al-Haytham / alhasein / alhazen problem.
This paper was enclosed in a letter to Henry Oldenburg dated at Paris [France] on 26 June 1669. The problem attributed to Alhazen (the Latinized name of Ibn al-Haytham (965-1045) is to find a point of reflection on the surface of a spherical mirror in relation to two points, the eye and the visible object.
The diagram and text are printed using a method that Huygens claimed he had invented, making the acid bite all the way through the plate and inking over it, as with a stencil.
Christopher Wren had come up with a similar copying method earlier in 1662.
Published in Philosophical Transactions as 'Excerpta ex epistolis non-nullis, ultrò citróque ab illustrissimis viris, Slusio & Hugenio, ad editorem scriptis, de famigerato albazeni problemate circa punctum reflexionis in speculis cavis aut convexis; & primò quidem ex prima Hugenii'.
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- 26 June 1669
- Physical description
- Ink on paper
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- 1 page
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Christiaan Huygens, Paper, 'Problema alhasein' [alhasein problem] by Christian Huygens at Paris, 26 June 1669, CLP/1/13, The Royal Society Archives, London, https://makingscience.royalsociety.org/items/clp_1_13/paper-problema-alhasein-alhasein-problem-by-christian-huygens-at-paris, accessed on 30 November 2023
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Excerpta ex epistolis non-nullis, ultrò citróque ab illustrissimis viris, slusio & hugenio, ad editorem scriptis, de samigerato albazeni problemate circa punctum reflexionis in speculis cavis aut convexis; & primò quidem ex prima hugenii, 26 Junii 1669. scripta: External link, opens in new tab.
Date: 6th October 1673
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The 'Classified Papers' of the Royal Society are papers from British and international natural philosophers and scholars categorised according to subject areas.View collection