Knowledge for the people, or, The plain why and because, 1. osaLilly & Wait, and Carter & Hendee, 1831 - 72 pages |
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Page 7
... less bulky and expensive than that used by the an- cients ? Because an air - pump , an electrical machine , a vol- taic battery , ( all upon a small scale ) a blowpipe appa- ratus , a bellows and forge , a mercurial and water - gas ...
... less bulky and expensive than that used by the an- cients ? Because an air - pump , an electrical machine , a vol- taic battery , ( all upon a small scale ) a blowpipe appa- ratus , a bellows and forge , a mercurial and water - gas ...
Page 11
... less bulk than when separate ? Because the atoms of the one are partially received into what were vacant spaces in the other . A similar condensation is observed in many other mixtures ; as a pound of sugar in a pound of water . Tin and ...
... less bulk than when separate ? Because the atoms of the one are partially received into what were vacant spaces in the other . A similar condensation is observed in many other mixtures ; as a pound of sugar in a pound of water . Tin and ...
Page 12
... less force than fifty or sixty pounds . Why is heat produced on slacking quick - lime ? Because of the violence of the chemical action , and the solidification of the water . In this process 68 parts of lime solidify 32 parts of water ...
... less force than fifty or sixty pounds . Why is heat produced on slacking quick - lime ? Because of the violence of the chemical action , and the solidification of the water . In this process 68 parts of lime solidify 32 parts of water ...
Page 19
... less risk and trouble , than was ever perhaps gained from an invention ! Why are the vessels for evaporating or distilling in vacuo , generally of arched form ? Because they require to be strong enough to bear , when quite empty , the ...
... less risk and trouble , than was ever perhaps gained from an invention ! Why are the vessels for evaporating or distilling in vacuo , generally of arched form ? Because they require to be strong enough to bear , when quite empty , the ...
Page 30
... less , the water penetrates the pores of the oxidated iron , and losing its polish , is evaporated . Why is water frozen in a vessel from which the air has been pumped out , and which contains bodies that quickly absorb its vapours ...
... less , the water penetrates the pores of the oxidated iron , and losing its polish , is evaporated . Why is water frozen in a vessel from which the air has been pumped out , and which contains bodies that quickly absorb its vapours ...
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Common terms and phrases
acid gas alloy ammonia animal arch argand burner Argand lamp becomes bodies boiling Bromine burning called candle carbonic acid carriage centre charcoal chemical chemistry chlorine coal coal gas coined colour combined combustion common condensed conductors contains cooled copper crystals cylinder diamond earth effect electricity employed equal evaporation exposed fire flame fluid force friction furnace gaseous glass gold grains gravity heat Hence horse hydrocyanic acid hydrogen hydrogen gas inch increased inflammable invention iron lamp lead less lever light lime liquid machine manufacture mass matter mechanical melted mercury metal miles minute mixture motion muriatic acid nature nearly nitric acid oxide oxygen particles pass pendulum phosphorus pieces plate platinum pound pressure produced proportion pure quantity resistance salt silver Sir Humphry Davy solid steam steam-engine steel stone substance sulphuric acid surface temperature tion tons vapour velocity vessel weight wheel wool yards
Popular passages
Page 138 - Soon shall thy arm, unconquered steam, afar Drag the slow barge, or drive the rapid car; Or on wide waving wings expanded bear The flying chariot through the fields of air, — Fair crews triumphant, leaning from above, Shall wave their fluttering kerchiefs as they move, Or warrior bands alarm the gaping crowd, And armies shrink beneath the shadowy cloud.
Page 114 - The sentence, no doubt, was thus intended: 'In less than half a minute, the respiration [being continued, these feelings] diminished gradually, and were succeeded by [a sensation] analogous to gentle pressure on all the muscles.
Page 16 - Welsh kings, where he enjoyed many privileges, and his weregeld was much higher than that of any other artificer. In the Welsh court the king's smith sat next to the domestic chaplain, and was entitled to a draught of every kind of liquor that was brought into the hall...
Page 58 - Lee, Master of Arts, of St. John's College, Cambridge, devised this profitable art for stockings (but being despised went to France) ; yet of iron to himself, but to us and others of gold, in memory of whom this is here painted.
Page 53 - ... matter : and the fact is proved, by holding a taper or a piece of burning phosphorus within a large flame, made by the combustion of alcohol, the flame of the candle or of the phosphorus will appear in the centre of the other flame, proving that there is oxygen, even in its interior part...
Page 14 - Why does the pendulum move faster in proportion as its journey is longer ? Because, in proportion as the arc described is more extended, the steeper are its beginning and ending ; and the more rapidly, therefore, the pendulum falls down at first, sweeps along the intermediate space, and stops at last.
Page 21 - Hence the common error in supposing that they generate force, or have a sort of innate power for saving labour ; whereas, neither simple machines nor mechanic powers save labour, in a strict sense of the phrase. Why, then, are these machines advantageous ? Because they allow a small force to take its time to produce any requisite magnitude of effect. Thus, one man's effort, or any small power, which is always at command, by working proportionally longer, will answer the purpose of the sudden effort...
Page 76 - ... form. From the extreme hardness of the diamond, a stronger degree of heat is required to inflame it, when exposed merely to air, than can easily be applied in close vessels, except by means of a strong burning lens ; but with nitre its combustion may be effected in a moderate heat.
Page 114 - Toward the last inspirations, the thrilling increased, the sense of muscular power became greater, and, at last, an irresistible propensity to action was indulged in : I recollect but indistinctly what followed ; I know that my motions were various and violent.
Page 53 - These results are best explained by considering the nature of the flame of combustible bodies, which, in all cases, must be considered as the combustion of an explosive mixture of inflammable gas, or vapour and air ; for it cannot be regarded as a mere combustion at the surface of contact of the inflammable matter...