The Panorama of Science: Or, a Guide to KnowledgeJ. M'Glashaw, 1849 - Всего страниц: 320 |
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acid action animals appears ascending ascertained atmosphere attraction axis ball balloon body called camera obscura cause centre of gravity centrifugal force chemical circle coloured rays concave mirror conductor consequently considerable CRANIOLOGY degree descend diameter direction discovery distance earth effect electricity electrified equal equator experiments fall feet fire fluid focus force fulcrum galvanic glass globe greater hand heat inches inflammable instance instrument iron length lens lever luminous machine magnetic means mercury metals miles moon motion move nature needle nitric acid north pole object obliquely observed orbit particles pass perpendicular person philosophers physiognomy piece planets pressure produced properties proportion pulley quantity rays of light reflected refracted remarkable render resistance retina rise round side situated south pole specific gravity substances sun's rays supposed surface temperature thermometer tion tube vapour velocity vessel Voltaic pile weight wind wire zinc
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Стр. 257 - The one has suggested to me, that beyond and above all that is visible to man, there may lie fields of creation which sweep immeasurably along, and carry the impress of the Almighty's hand...
Стр. 71 - Aries the Ram, Taurus the Bull, Gemini the Twins, Cancer the Crab, Leo the Lion, Virgo the Virgin, Libra the Balance, Scorpio the Scorpion, Sagittarius the Archer, Capricornus the Goat, Aquarius the Waterbearer, and Pisces the Fishes...
Стр. 186 - ... been exposed, is taken away, it throws out a pencil of flame so long, that with this burning machine in my hand, I have taken above sixty steps in walking about my room. When it is electrified strongly, I can take it into another room, and there fire spirits of wine with it.
Стр. 188 - He afterwards demonstrated by experiments, that the electricity did not reside in the coating, as had been supposed, but in the pores of the glass itself. After a phial was charged, he removed the coating, and found that, upon applying a new coating, the shock might still be received.
Стр. 98 - ... called in geometry a parabola. But when the ball is thrown perpendicularly upwards, it will descend perpendicularly ; because the force of projection, and that of gravity, are in the same line of direction. We have noticed the centres of magnitude and of motion, but we have not yet explained what is meant by the centre of gravity. It is that point about which all the parts of a body exactly balance each other, in every position of the body ; if, therefore, that point is supported, the body will...
Стр. 108 - ... circle in the same space of time that the axle describes a small one; therefore the power is increased in the same proportion as the circumference of the wheel is greater than that of the axle. If the velocity of the wheel...
Стр. 224 - Nothing more convincingly shows how requisite experience is to correct the errors of sight, than the case of a young man who was blind from his infancy, and who recovered his sight at the age of fourteen, by the operation of couching. At first he had no idea either of the size or distance of objects, but imagined that...
Стр. 318 - ... now become the abodes of myriads of peaceful, civilized, and friendly men, where the desert and impenetrable forest are changed into cultivated fields, rich gardens, and magnificent cities. It is the strong intellect of man, operating with the faculty of language as a means, which has gradually worked this wonderful change. By language, fathers communicated their gathered experience and reflections to their children, and these to succeeding children, with new accumulation: and when, after many...
Стр. 110 - Yes ; friction is the resistance which bodies meet with in rubbing against each other ; there is no such thing as perfect smoothness or evenness in nature: polished metals, though they wear that appearance, more than any other bodies, are far from really possessing it; and their inequalities may frequently be perceived through a good magnifying glass. When, therefore, the surfaces of the two bodies come into contact, the prominent parts of the.
Стр. 87 - The moon is a month in going round the earth ; twice during that time, therefore, at full and at change, she is in the same direction as the sun. Both then act in conjunction on the earth, and produce very great tides, called...