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Letter from Charles Babbage to John Lubbock

He congratulates him on his commercial tables: 'I admire your tables and have made use of one the 3 per cent. - It is exceedingly desirable to have the Constants of Commerce and Manufactures and when I have printed my volume I will try to make the manufacturers who are most interested collect more of them'.

Letter from George Airy

Observatory - GA returns a parcel of amethystine crystals of which, due to their rough surfaces, he has been able to make nothing. 'I have lately determined an odd thing in the way of polarization, viz that the light of ladies eyes is polarized - at least when viewed in particular directions. When deprived of this light, the eye has a most unnatural appearance'.

Letter from George Airy

Observatory - GA gives WW references to French works on polarisation written between 1808 and 1824: 'Most of Biot's papers are tremendous to a person who is not very familiar with the subject, & perfectly easy to one who is familiar with it and has thought upon it well'.

Letter from George Airy

Observatory - There is not a word about undulations in the papers by William Herschel on Newton's rings, in the Philosophical Transactions for 1807 and 1809 respectively: 'I have been observing the following curious phenomenon. If Newton's rings be produced by two glasses, however they be viewed the central spot is black. But if a glass be placed on metal, and viewed with polarised light (polarised to plane of reflection) then up to the polarising angle the central spot is black, and instantly beyond that it is white. This I anticipated from Fresnel's [experiments]: it is confirmatory of them, and defies emissions'.

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