Christian Huygens, dated at Paris, to Henry Oldenburg

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                                et divisis omnibus 
per y et ductis in a 

qua aequaetio est ad hyperbolam 

Sit ... ergo 

Unde porro non difficulter invenitur sequens constructio 
Jungantur BA, AC et applicato seorsim 
ad utramque quadrato radii AD, fiant 
inde AP, AG et Juncta PG, dividatur 
ipsa bifariam in R, et per punctum 
R ducantur RD, RN sese ad rectos angulos 
Secantes quarumque RD sit parallela 
AD quae dividit bifariam angulum 
BAC. Erunt jam RD, RN asymptoti 
oppositarum hyperbolarum quarum alter 
per carebrum A transire debet, quaeque 
Secabunt circumferentiam in punctis H 
quaesilis. Transibunt autem hyperbolae etiam 
per puncta P, G.
Ratio constructionis apparet ductis Py et Qz perpendicularibus in AM fit 
enim ......
                            
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Manuscript details

Author
Christiaan Huygens
Reference
EL/H1/73
Series
EL
Date
1672
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Christian Huygens, dated at Paris, to Henry Oldenburg, 1672. From The Royal Society, EL/H1/73

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