Physics
Found in 30 Collections and/or Records:
Adnotata Phys: a D. Boyleo 1691 et ab Fatio, 1691
Notes on conversations with Boyle and Fatio, including the former's notions on the quantity of motion in bodies rotated about their own axis, and the latter's theory of gravity.
Astronomiae Physicae et Geometricae Elementa, 28 February 1698
Notes from a London meeting with Sir Isaac Newton on a revised plan for the Astronomiae physicae et geometricae elementa, (1702), Gregory's most important work. An erratum lies at the foot of this document, unrelated to it or to any of the other things on the sheet (which have their own entries in Gregory's index): a jotting about refraction, crystals, and cataracts of the eye. This is dated London, 30 May 1708.
Camera Auscultatoria, Lanterna Magica..., 1680
Novelties seen and sketched by Gregory in Paris and the low countries. These included a camera obscura and a candle-powered projector.
Corrigenda to the Astronomiae, 1698-1699
Editorial issues in Gregory's major textbook.
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 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 gyratione Globorum de collisione mutua Probl: Halleianum 3, c January 1695
Treatment of Sir Edmond Halley's method of finding the rotary motions produced in two spheres by an oblique impact. Appears to have been written in a hand other than David Gregory's, [Halley's?] though the title is clearly in his.
De resolutione equationum cubicarum, 1684-1696
Notes on a universal theorem on the forces on inclined planes, possibly part of his notes on Huygen's Horologium Oscillatorium, now lost.
Descriptio Machinae ad Planetarum Motuu exhibendum ... in obsero: Paris, 1680
Diagrams and explanations of things Gregory saw in Paris in December of 1680: a pendulum of the sort used in Huygens' famous horologium, an enormous quadrant, and the moving planetary model of one Dr Romer. This was probably the Danish astromechanic Ole Roemer (1644-1710).
Dr Gregorys solution of the same, s.d.
Gregory's solution to the specific gravity problem in item C 94.