. Philosophical transactions. d that y wasmuch larger than (3, while Flamsteed marks both of thefame magnitude -f*. It may alfo be added, as fhewing that /jLyrae varied in former times, that Hevelius, in his Catalogue,differs from Flamsteed, and marks y^Q^ ^he third rnagnltucie, * Phil. Tranf. for 1782, p. 14?.t Phil. Tranf. for 1783, p. 256. Y % ■ aiid 164 Mr, Goodrickes Obfervations of a new Variable Star, and iS of between the fourth and third. I have, however,fome doubts whether the variation of this ftar does not entirelyceafe or become lefs vifible in certain years. Thefe doubts arifefro
. Philosophical transactions. d that y wasmuch larger than (3, while Flamsteed marks both of thefame magnitude -f*. It may alfo be added, as fhewing that /jLyrae varied in former times, that Hevelius, in his Catalogue,differs from Flamsteed, and marks y^Q^ ^he third rnagnltucie, * Phil. Tranf. for 1782, p. 14?.t Phil. Tranf. for 1783, p. 256. Y % ■ aiid 164 Mr, Goodrickes Obfervations of a new Variable Star, and iS of between the fourth and third. I have, however,fome doubts whether the variation of this ftar does not entirelyceafe or become lefs vifible in certain years. Thefe doubts arifefrom fome obfervations of Cassini in Phil. Tranf. N° j^,p. 2198. where I find that in obferving the new ftar, whichthen appeared near the beak of the Swan, he compared it veryfrequently for upwards of a month to /3 and y Lyrae, yetwithout perceiving, or even fufpe6ling, that /3 was variable,,though it was eafy for him to have perceived it, if th^ varia-^tioa had then been even lefs than it is now. lam, &c. JOHN GOODRICKE*. [ »^5 ] X. On the Motion of Bodies affedied by FnSlion. By the Rev,Samuel Vince, A. M. of Cambridge; CGinmunicated byAnthony Shepherd, T). D. F» R. S. Plumian Profejfor cfAfironomy and experimental Philofophy at Cambridge. Read November 25, i784». THE fubjed of the paper which I have now the honourof prefenting to the Royal Society, feems to be of avery conliderable importance both to the practical mechanicand to the fpeculative philofopher ;. to the former, as a know-ledge of the laws and quantity of the fri6tion of bodies in motionupon each other will enable him at firft to render his machinesmore perfect, and fave him in a great meafure the trouble ofcorrecting them by trials; and to the latter, as thofe lawswill fnrnifh him with principles for his theory, which wheneftablidied by experiments will render his conclufions appli-cable to the real motion of bodies upon each other. But, how-ever important a part of mechanics this fubjeCl may conftitute,and h
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