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Lectures on Experimental Philosophy, Astronomy, and Chemistry ..., Volume 1
G. (George) Gregory
No preview available - 2012
Lectures on Experimental Philosophy, Astronomy, and Chemistry ..., Volume 2
G. 1754-1808 Gregory
No preview available - 2016
added alkali animal appears applied atmosphere attraction becomes bodies boiling called caloric carbon carbonic acid charcoal chemistry clay cold colour combined combustible common compound consequently considerable consists contain converted copper crystals dissolved distillation earth easily eclipse effect equal equator evaporation experiments exposed fire fixed flame fluid gives glass gold greater heat Hence hydrogen increased iron kind known lead lecture less lime manner mass matter means melted metals mineral mixed mixture moon muriatic nature necessary nitric acid nitrogen observed obtained oxide oxygen particles particular pass portion potass powder precipitated present principle produced properties proportion pure quantity reason receiver remains render require rises salt separated silver soda solid solution sometimes spirit stone strong substances sufficient sulphuric acid supposed surface takes throw tion vapour vegetable vessel volatile weight whole wine
Page 1 - ... to the inclination of the axis of the earth to the plane of the ecliptic, and partly to the different positions in which a spectator is placed in different zones of the globe.
Page 22 - An eclipse of the sun can only take place when the moon is in conjunction with the sun, and when she is in one of her nodes, or very near it. Suppose the line EE (fig. 8) to be a portion of the ecliptic, and LL a portion of the orbit of the moon, cutting the ecliptic in the point N, at an angle of a little more than five degrees. Then, if in the moment of her conjunction the moon is found in the point F of her orbit, she will be too far from her node to intercept the sun's light, and cause an eclipse.
Page 86 - ... to combine with the oxygen of the atmosphere, and this oxygen during its combination lets go the caloric with which in the state of air or gas it was combined.
Page 86 - It is of course incombustible, because; its base being already saturated with oxygen, cannot combine with any more.
Page 26 - But the falling back of the line of conjunctions, or oppositions of the sun and moon 28' 12", with respect to the line of the nodes in every period, will wear it out in process of time; and after that it will not return again in less than 12,493 years.
Page 246 - When a sheet of pure tin is immersed in a solution of nitro-muriate of gold, the oxide of gold is precipitated of a purple colour; and, when scraped off and collected, forms the purple powder of Cassius, much employed in enamelling.
Page 25 - ... 225 days; in which time there would always be a regular period of eclipses, if any complete number of lunations were finished without a fraction. But this never happens ; for if both the Sun and Moon should start from a line of conjunction with either of the nodes in any point of the ecliptic, the Sun would perform 18 annual revolutions and 222 degrees over and above, and the Moon 230 lunations and 85...