Diagrams of cycloids
Date
15 July 1673
Creator
Unknown, Artist
Object type
Archive reference number
Manuscript page number
vol6 p219
Material
Dimensions
height (page): 301mm
width (page): 170mm
width (page): 170mm
Subject
Description
Diagrams of 'imperfect' cycloids by John Wallis. In response to Francis Jessop's comments on his theory of tides, Wallis explained that the imperfect cycloid did not have its base ba as the perpendicular to the curve ac (as Jessop supposed and as shown in the top diagram), but that the base ba was a tangent to the curve ac and perpendicular to it at ap (as in the bottom figure). Wallis originally made his comments in the margin of Jessop's letter dated 25 June 1673 and addressed to Martin Lister, who had forwarded it to Henry Oldenburg so that Wallis could comment on it. Copied from LBO/6/190. The original is at EL/W2/10/001.
Francis Jessop (1638-1691) was a freeman of the Cutler's Company of Sheffield and a close friend of John Ray (Correspondence of Henry Oldenburg, ed. by Hall and Hall, vol. 10, p. 71n).
Francis Jessop (1638-1691) was a freeman of the Cutler's Company of Sheffield and a close friend of John Ray (Correspondence of Henry Oldenburg, ed. by Hall and Hall, vol. 10, p. 71n).
Associated place