Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1871
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1871natur...4..366d&link_type=abstract
Nature, Volume 4, Issue 97, pp. 366 (1871).
Astronomy and Astrophysics
Astronomy
Scientific paper
PERMIT me to state that the diagrams in No. 94 of the 17th June to Mr. Hubert Airy's Pendulum Autographs,'' are identical with the ``Kinematic Curves`` by Mr. Perigal, drawn by him upwards of thirty years ago, and discovered by Mr. Sang of Edinburgh two years previously (On the Vibration of an Elastic Spring, Ed. Ph. Tr.), autographic copies being in the possession of the Royal Society, Royal Institution, and Royal Astronomical Society. Vide my application of the Binomial Theorem to Perigal's Bicircloids (Lond. Phil. Mag. 1849-1850). Mr. Perigal calls these curves, Lemnoids, Paraboloids, &c.
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