Lectures on Experimental Philosophy, Astronomy, and Chemistry: Intended Chiefly for the Use of Students and Young Persons, Volume 2Longman, 1820 - Astronomy |
From inside the book
Results 1-5 of 19
Page 81
... clay , water , and quicksilver , and expose this mass to heat , the water will first rise in vapour , and be entirely expelled before the mercury begins to rise , and this vapour may be condensed into pure water . By increasing the heat ...
... clay , water , and quicksilver , and expose this mass to heat , the water will first rise in vapour , and be entirely expelled before the mercury begins to rise , and this vapour may be condensed into pure water . By increasing the heat ...
Page 107
... clay , and consequent- ly renders it less apt to break . If the vessel is required to be very compact , more clay and less sand must be used : they must be heated and cooled slowly . If vessels are necessary that will bear to be heated ...
... clay , and consequent- ly renders it less apt to break . If the vessel is required to be very compact , more clay and less sand must be used : they must be heated and cooled slowly . If vessels are necessary that will bear to be heated ...
Page 109
... clay and sand , which do not contract with heat : for very intense heat , we must have a retort of the same materials with the crucibles . In many operations of the retort we have occasion to mix two substances in order to obtain a ...
... clay and sand , which do not contract with heat : for very intense heat , we must have a retort of the same materials with the crucibles . In many operations of the retort we have occasion to mix two substances in order to obtain a ...
Page 123
... clay in their composition : they are used to stop the junctures of vessels when the heat is gentle ; but it is better to leave a hole made with a pin than to shut the juncture quite close . Flour and water with gum arabic is good for ...
... clay in their composition : they are used to stop the junctures of vessels when the heat is gentle ; but it is better to leave a hole made with a pin than to shut the juncture quite close . Flour and water with gum arabic is good for ...
Page 124
... clay mixed with seven times its quantity of white sand . The clay only serves to combine the particles of sand together , for sand resists the most violent heat . A good luting for lining the internal part of a furnace is made of char ...
... clay mixed with seven times its quantity of white sand . The clay only serves to combine the particles of sand together , for sand resists the most violent heat . A good luting for lining the internal part of a furnace is made of char ...
Other editions - View all
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 animal 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 compound condensed contain converted into vapour copper crystals degree of heat deliquescent dissolved distillation earth eclipse effect effervescence equator evaporation exposed fire flame fluid fluidity freezing furnace fusion glass Hence hydrogen hydrogen gas iron lecture lime liquor magnesia matter melted mercury metals mineral waters mixed mixture moon mucilage muriatic acid nitrat nitric acid nitrogen node obtained orbit oxide oxygen oxygen gas particles phænomenon phosphorus portion potass powder precipitated produced proportion pure resins rises saltpetre saturated sensible heat separated silver small quantity smell soda solid solution sometimes specific gravity spirit of wine stances strata strong substances sulphat sulphuric acid surface tains temperature tion transparent vegetable vessel volatile alkali
Popular passages
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...