Showing Records: 61 - 70 of 318
Curva Cragio exhibitur, July 1687
Gregory, probably with Pitcairne at his side, sent these curves to Craige in Cambridge, challenging him to find their quadrature. Thus the writing that is not in Gregory's hand may be Craige's.
Curva foliata, c1693
Diagram and mathematical description of a foliate curve. A modern hand has pencilled in "7 a Schooten", referring to geometer Frans van Schooten (1615-1660).
De aequationibus Cubicis, s.d.
Gregory on cubic equations.
De affirmanda parallaxi magni orbis, cogitatum Hugenii, June 1693
A transcription of Christiaan Huygen's argument that because stars' observed radii are so insensibly small, the diameter of the earth's orbit relative to the stars' position is also insensible, and thus the parallax measurement, which ought to prove or disprove the Copernican layout of the heavens, is useless.
De Aleis Theorema, 1680
Thoughts on dice-throwing, written up in Leyden, and contained (once with other things?) under the rubric "Varia Observationes". One of those may have been item C 154, next in the volume.
De Antlia Pneumatica ..., 1681
Notes from a trip to London in May and early June of 1681. Gregory saw Boyle's pneumatic pump (an 'antlia' is a siphon) and a method of making 'leaves' with molten glass and water. One Mr Lamb discussed copper engraving with him. He saw Newton's reflecting telescope in Gresham College.
De Cartesiana Constructione ..., c1680
A note, probably composed at Rotterdam, on the Latin edition of Rene Descartes' Geometria, (1659), published by Schooten.
De Communi sectione superficiorum D.G., 1694
Notes on cylinders and spheres.
De Constructione problematum planorum, c1703
Certain propositions in Euclid.
De curva a Tschurnhausio in exemplum sua methodi adducta, 5 November 1688
An example of quadrature by 'Tschurnhaus', in Gregory's hand.