Reference numberCLP/1/13
TitlePaper, 'Problema alhasein' [alhasein problem] by Christian Huygens at Paris
Date26 June 1669
DescriptionOn 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.

Subject: Geometry

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'.
Physical descriptionInk on paper
Digital imagesView item on Science in the Making
Access statusOpen
Related materialDOI: 10.1098/rstl.1673.0045
Printed in 'Philosophical Transactions', vol 8, no 97, p 6119, (1673) under the title 'albazeni problemate'
Related records in the catalogueCLP/1/13/1
Fellows associated with this archive
NA8062Huygens; Christiaan (1629 - 1695); natural philosopher1629 - 1695
NA8001Oldenburg; Henry (c1619 - 1677); scientific correspondentc1619 - 1677
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