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De gyratione Globorum de collisione mutua Probl: Halleianum 3, c January 1695
Item
Identifier: Coll-33/Quarto A [7]
Scope and Contents
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.
Dates:
c January 1695
Observata et Dicta ... cum Huygeno Junio 1693, 30 June 1693
Item
Identifier: Coll-33/Quarto A [14]
Scope and Contents
Remarks en passant about library volumes in history and physics seen in Leiden. A longer passage follows: notes to a conversation with Christiaan Huygens, critiquing Sir Isaac Newton's notions of absolute motion and the propagation of light. Huygens also says that John Flamsteed ought to declare for the absolute speed of light, and that this should persuade Jean Dominique Cassini.
Dates:
30 June 1693