Record

Reference numberCLP/1/13
LevelFile
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 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
Extent1p
FormatManuscript
Physical descriptionInk on paper
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
CLP/1/13/2
Fellows associated with this archive
CodeNameDates
NA8062Huygens; Christian (1629 - 1695); natural philosopher1629 - 1695
NA8001Oldenburg; Henry (c 1619 - 1677); scientific correspondentc 1619 - 1677
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