ما يقوله الناس - كتابة مراجعة
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angle of incidence angle of refraction axis blue bodies Brewster Catoptrics cause CHAPTER colour concave mirror converging convex crystal direction discovered discovery diverging double refraction emitted equal experiment eye glass fluid focal distance focus of parallel formed greater Gregorian Telescope hypothesis incident ray inflecting instrument invented lens lenses less light fall light passes magnifying power manner mica Microscope motion move nature nearer nitric acid object appears object glass observed optic axes paper parallel rays particles of light perpendicular phenomena philosophers placed plane mirror plate polarising angle prism produced Prop properties proposition rays fall rays of light reflected ray reflecting telescope refracting medium refractive power refrangible repulsive force repulsive medium retina right angles right line seen shadow side sine Sir Isaac Newton situated spherical substance subtended supposed telescope Theorem thickness tion tourmaline transmitted Treatise ultimate particles velocity violet
الصفحة 2 - All these things being considered, it seems probable to me that God in the beginning formed matter in solid, massy, hard, impenetrable, moveable particles, of such sizes and figures, and with such other properties and in such proportion to space as most conduced to the end for which he formed them...
الصفحة 20 - Lead then, said Eve. He leading swiftly roll'd In tangles, and made intricate seem straight. To mischief swift. Hope elevates, and joy Brightens his crest. As when a wandering fire, Compact of unctuous vapour, which the night Condenses, and the cold environs round, Kindled through agitation to a flame, Which oft, they say, some evil spirit attends, Hovering and blazing with delusive light, Misleads the amazed night-wanderer from his way To bogs and mires, and oft through pond or pool, There swallow'd...
الصفحة 2 - ... these primitive particles being solids are incomparably harder than any porous bodies compounded of them, even so very hard as never to wear or break in pieces, no ordinary power being able to divide what God himself made one in the first creation.
الصفحة 96 - I appeal to any one's experience, whether, upon sight of an object, he computes its distance by the bigness of the angle made by the meeting of the two optic axes?
الصفحة 7 - By virtue of this life, the great masses are held together in their ordinary courses, as well as the minutest particles, governed in their natural motions, according to the several laws of attraction, gravity, electricity, magnetism, and the rest. It is this gives instincts, teaches the spider her web, and the bee her honey. This it is that directs the roots of plants to draw forth juices from the earth, and...
الصفحة 140 - POE or 40 degr. 17 min. (hall be the greateft Angle in which the moft refrangible rays can after one reflexion be refracted to the Eye, and therefore all the Drops in the line OE fhall fend the moft refrangible rays moft copioufly to the Eye, and thereby ftrike the fenfes with the deepeft violet Colour in that region.
الصفحة 65 - This amounts to the same with saying, that, in the case before us, the sine of the angle of incidence is to the sine of the angle of refraction in a given ratio.
الصفحة 6 - There is according to those philosophers a life infused throughout all things: the irvp votpov, inp Tfxvixov, an intellectual and artificial fire, an inward principle, animal spirit, or natural life producing and forming within as art doth without, regulating, moderating and reconciling the various motions, qualities and parts of this mundane system. By virtue of this life the great masses are held together in their orderly courses, as well as the minutest particles governed in their natural motions,...
الصفحة 110 - ... in the direction of the length of the cylinder, were terminated by two dark strokes, a little more than a line in breadth. Within these dark lines there was a faint light equally dispersed through the shadow, which formed a uniform penumbra, much lighter than the dark strokes at the extremity or than the shadow received near the cylinder.
الصفحة 57 - When the fleet of Marcellus was within bow-shot, the old man, Archimedes, brought an hexagonal mirror, which he had previously prepared, at a proper distance from which he also placed other smaller mirrors of the same kind that moved in all directions on hinges, which, when placed in the sun's rays, directed them upon the Roman fleet, whereby it was reduced to ashes.