A general view of the sciences and arts, Τόμος 2 |
Περιεχόμενα
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Άλλες εκδόσεις - Προβολή όλων
A General View of the Sciences and Arts: Equally Adapted to Domestic and to ... William Jillard Hort Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2016 |
A General View of the Sciences and Arts: Equally Adapted to Domestic and to ... William Jillard Hort Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2016 |
Συχνά εμφανιζόμενοι όροι και φράσεις
acid alkali ancient animals antimony appear attraction blood body bones called caloric Camera Obscura carbon carbonic acid centre CHAP chemical colour combined combustion concave lens concave mirror conductor consists converging convex lens copper decomposed degree distance diverging divided earth effects electrical fluid excited electric external feet flowers Galvanism glass Greek heat hydrogen hydrogen gas ideas insects instruments invented iron kind larynx lenses liquid medium melted membrane metals microscope mode motion muscles nature nerves nitric acid object optic optic nerve organs oxide oxygen particles pass peculiar placed plants plates poetry poles principal produced properties proposition quantity rays of light reflected refracted retina seed side Sophisms sounds spherical stamens stances stone substance sulphur sulphuric acid surface taste tion transmitted transparent tree tribe tricity tube various vegetables verb vessel Voltaic pile whence words
Δημοφιλή αποσπάσματα
Σελίδα 282 - Pouring forth tears at such a lavish rate, That were the world on fire, they might have drown'd The wrath of Heaven, and quench'd the mighty ruin.
Σελίδα 24 - It' a man place himself directly before a large concave mirror, but farther from it than its centre of concavity, he will see an inverted image of himself in the air, between him and the mirror, of a less size than himself. And if he hold...
Σελίδα 14 - ... the angle of reflection is always equal to the angle of incidence, the image for any point can be seen only in the reflected ray prolonged.
Σελίδα 24 - ... than himself, and if he hold out his hand towards the mirror, the hand of the image will come out towards his hand, and coincide with it...
Σελίδα 15 - In a very dark Chamber at a round hole about one third part of an Inch broad made in the Shut of a Window I placed a Glass Prism, whereby the beam of the Sun's Light which came in at that hole might be refracted upwards toward the opposite Wall of the Chamber, and there form a coloured Image of the Sun.
Σελίδα 254 - II. A Dilemma is an argument which divides the whole into all its parts or members by a disjunctive proposition, and then infers something concerning each part which is finally inferred concerning the whole.
Σελίδα 4 - ... fuppofing a line drawn perpendicularly to the furface of the medium, through the point where the ray enters, and extended both ways, the ray, in paffing through the...
Σελίδα 15 - ... passing through the middle of the prism from one end of it to the other end parallel to the edge of the refracting angle) was in this and the following experiments perpendicular to the incident rays. About this axis I turned the prism slowly, and saw the refracted light on the wall or coloured image of the sun first to descend, and then to ascend. Between the descent and ascent when the image seemed stationary, I stopped the prism, and fixed it in that posture, that it should be moved no more.
Σελίδα 25 - If he reach his hand farther, the hand of the image will pass by his hand, and come between it and his body ; and if he move his hand towards either side, the hand of the image will move towards the other ; so that, whatever way the object moves, the image will move the contrary way. A bystander will see nothing of the image, because none of the reflected rays that form it enter his eyes.
Σελίδα 57 - The needle with the card turns on an upright pin fixed in the centre of the box. In the centre of the needle is fixed a brass conical socket or cap, whereby the card hanging on the pin turns freely round the centre. The top of the box is covered with a glass that the card's motion may not be disturbed by the wind.