Lectures on Experimental Philosophy, Astronomy, and Chemistry: Intended Chiefly for the Use of Students and Young Persons, Volume 2R. Phillips, 1808 - Science |
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Page 7
... proportion as the ecliptic exceeds the tropic in dimensions . The circumference of the ecliptic is to that of the tropic as 60 to 55 , and therefore the arc ab of 55 minutes on the ecliptic , will be 60 in the tropic . As every meridian ...
... proportion as the ecliptic exceeds the tropic in dimensions . The circumference of the ecliptic is to that of the tropic as 60 to 55 , and therefore the arc ab of 55 minutes on the ecliptic , will be 60 in the tropic . As every meridian ...
Page 9
... proportion as the sun continues to advance from the equator to the tropic of Cancer , that is , from the time of the vernal equinox ; on the contrary , it becomes shorter than that period , in proportion as the sun advances from the ...
... proportion as the sun continues to advance from the equator to the tropic of Cancer , that is , from the time of the vernal equinox ; on the contrary , it becomes shorter than that period , in proportion as the sun advances from the ...
Page 12
... the sun rises or sets perpendicularly to the horizon , which is at the time of the equinoxes to those who live under the equator , or who have a right sphere . The length of twilight increases in proportion as 12 [ Lecture 23 . Astronomy .
... the sun rises or sets perpendicularly to the horizon , which is at the time of the equinoxes to those who live under the equator , or who have a right sphere . The length of twilight increases in proportion as 12 [ Lecture 23 . Astronomy .
Page 13
... proportion as the pole is more elevated above the horizon , or in proportion as the place has a higher latitude . Thus , if the latitude is such that the sun at mid- night on the 21st of June cannot have descended eighteen degrees below ...
... proportion as the pole is more elevated above the horizon , or in proportion as the place has a higher latitude . Thus , if the latitude is such that the sun at mid- night on the 21st of June cannot have descended eighteen degrees below ...
Page 21
... proportion as the moon is nearer the earth at the time of the eclipse : there have even been eclipses when the moon has to- tally disappeared , but this is a rare phænome- non . An eclipse of the sun can only take place when the moon is ...
... proportion as the moon is nearer the earth at the time of the eclipse : there have even been eclipses when the moon has to- tally disappeared , but this is a rare phænome- non . An eclipse of the sun can only take place when the moon is ...
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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: Intended ... No preview available - 2019 |
Common terms and phrases
acid gas alkali alum ammonia appears applied atmosphere attraction for water becomes bodies boiling burning called caloric carbonat carbonic acid carbonic acid gas charcoal chemical chemistry chemists clay cold colour combined combustible common salt compound condensed contain converted into vapour copper crystals degree of heat deliquescent dissolved distillation earth easily eclipse effect effervescence equator evaporation exposed fire flame fluid fluidity freezing furnace fusion glass Hence hydrogen inflammable iron lecture lime liquor magnesia matter melted mercury metals mineral waters mixed mixture moon mucilage muriatic acid nitrat nitric acid nitrogen node obtained oxide oxygen oxygen gas particles phænomenon phosphorus portion potass powder precipitated produced proportion pure render resins rises sal ammoniac saltpetre saturated sensible heat separated silver small quantity smell soda solid solution sometimes spirit of wine stances stone strata sulphat sulphuric acid surface temperature tion transparent vegetable vessel weight
Popular passages
Page 19 - ... passes by the nodes but twice in a year, it is no wonder that we have so many new and full moons without eclipses.
Page 37 - ... or trough AZ full of water, with a shelf, KKK, in it. B, G, F are glass jars or receivers, inverted with their mouths' downwards. We shall point out its use by the example of Oxygen gas. C is a glass bottle into which are put some red-lead or manganese, and a small quantity of dilute sulphuric acid. D is a glass tube generally* fitted by grinding- to the neck of the bottle, and curved so as to enter conveniently below the shelf and communicating -with one of the jars or receivers B, 6, F.
Page 183 - This salt is dissolved in water, and half its weight of potass added. The Magnesia is immediately precipitated ; because potass has a stronger affinity for the sulphuric acid: it is then to be washed with a sufficient quantity of Wiiti-i-, ami dried.
Page 25 - ... not be difficult to conceive how astronomers are able to foretel the exact time when any phenomenon of this kind will happen. For as an eclipse can only take place at the time of a new or full moon, the chief requisites are to determine the number of mean conjunctions and oppositions that will arrive in every year, and the true places of the sun and moon in their orbits at each of those times. And if from this it appears, that the two luminaries are within the proper limits of the node, there...
Page 4 - The true cause of the variation of the seasons consists in the inclination of the axis of the earth to the plane of its orbit; or, in other words, to the ecliptic.
Page 236 - When a sheet of pure tin is immersed in a solution of nitromuriate 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. Or the...
Page 24 - ... 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...
Page 219 - I shall, till some better method be proposed, distinguish them from each other, by prefixing to the word oxide the first syllable of the Greek ordinal numerals. Thus the protoxide of a metal will denote the...
Page 21 - 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.
Page 82 - ... those of Lavoisier and his friends. The example of these celebrated men was soon followed by all the young chemists of France. Mr. Lavoisier's explanation of combustion depends upon the two laws discovered by himself and Dr. Black. When a combustible body is raised to a certain temperature, it begins to combine with the oxygen of the atmosphere, and this oxygen during its combination lets go the caloric and light with which it was combined while in the gaseous state. Hence their appearance during...