|Title||Paper, 'Problema alhasein' [alhasein problem] by Christian Huygens at Paris|
|Date||26 June 1669|
|Description||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'.
|Physical description||Ink on paper|
|Related material||DOI: 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 catalogue||CLP/1/13/1|
Fellows associated with this archive
|NA8062||Huygens; Christiaan (1629 - 1695); natural philosopher||1629 - 1695|
|NA8001||Oldenburg; Henry (c1619 - 1677); scientific correspondent||c1619 - 1677|