Popular scientific recreations, tr. and enlarged from 'Les récréations scientifiques'. |
Dentro del libro
Resultados 1-5 de 30
Página 107
... continuous impression , like that which would be produced if the light given during each period were distributed in an equal manner through- out the whole duration of the period . To verify. Fig . 104. - Experiment 2 . Fig . 106. Disc ...
... continuous impression , like that which would be produced if the light given during each period were distributed in an equal manner through- out the whole duration of the period . To verify. Fig . 104. - Experiment 2 . Fig . 106. Disc ...
Página 108
... continuous effect . The white may also be distributed in other ways , and provided only that on all the circles of the disc the proportion of the angles covered with white is the same , they will always exhibit the same grey colour ...
... continuous effect . The white may also be distributed in other ways , and provided only that on all the circles of the disc the proportion of the angles covered with white is the same , they will always exhibit the same grey colour ...
Página 109
... continuous manner the proportions of the colours . The most perfect construction is that of Busold's chromatic top ( fig . III ) , which should only be employed for very rapid rotations . The disc , which weighs 5 lbs . , is made of an ...
... continuous manner the proportions of the colours . The most perfect construction is that of Busold's chromatic top ( fig . III ) , which should only be employed for very rapid rotations . The disc , which weighs 5 lbs . , is made of an ...
Página 111
... continuous manner , conformably with the differences of successive images . With a difference of speed , we obtain a new series of phenomena . A most simple contrivance of this kind is a top of C. B. Dancer , of Manchester ( fig .
... continuous manner , conformably with the differences of successive images . With a difference of speed , we obtain a new series of phenomena . A most simple contrivance of this kind is a top of C. B. Dancer , of Manchester ( fig .
Página 112
... continuous motion . We must distinguish between the phenomena of successive contrast and simultaneous contrast . Phenomena of successive contrast develop what are called accidental images . If we fix our eyes for a considerable time on ...
... continuous motion . We must distinguish between the phenomena of successive contrast and simultaneous contrast . Phenomena of successive contrast develop what are called accidental images . If we fix our eyes for a considerable time on ...
Términos y frases comunes
acetic acid ammonia angles animals antimony apparatus appear atmosphere attraction axis ball balloon battery body called carbonic acid carpel cause cells centre chemical clouds colour combination compound contains copper crustacea crystals cylinder disc distance earth effect electricity equal experiment feet flowers fluid force give glass globe gravity heat hydrogen illustration fig infusoria instrument iron known lamp Leyden jar light lime liquid machine magnet means mercury metal miles minerals moon motion movement nature needle nitric acid nitrogen object observed obtained oxide oxygen paper particles pass perceived phenomena phosphorus piece pistil plants plate platinum pole portion position possess Praxinoscope pressure produced rays retina rocks rotation round salt seen silver sound specific gravity stamens stars substances sulphate sulphuric acid surface temperature termed tion tube turn vapour vegetable vibrations weight wheel wind wire zinc
Pasajes populares
Página 447 - The squares of the periods of revolution of any two planets are proportional to the cubes of their mean distances from the sun.
Página 311 - There is a place for everything and everything is in its place.
Página 533 - He telleth the number of the stars, and calleth them all by their names.
Página 549 - There rolls the deep where grew the tree; Oh, Earth, what changes hast thou seen ! There, where the long street roars, has been The stillness of the central sea. The hills are shadows, and they flow From form to form, and nothing stands ; They melt like mists, the solid lands — Like clouds, they shape themselves and go...
Página 466 - ... 430 feet ; Mars, a rather large pin's head, on a circle of 654 feet ; Juno, Ceres, Vesta, and Pallas, grains of sand, in orbits of from...
Página 446 - Had in her sober livery all things clad; Silence accompanied, for beast and bird, They to their grassy couch, these to their nests, Were slunk, all but the wakeful nightingale; She all night long her amorous descant* sung; Silence was pleased: now...
Página 492 - Saw the moon rise from the water Rippling, rounding from the water, Saw the flecks and shadows on it, Whispered, "What is that, Nokomis?" And the good Nokomis answered : " Once a warrior, very angry, Seized his grandmother, and threw her Up into the sky at midnight; Right against the moon he threw her ; "Tis her body that you see there." Saw the rainbow in the heaven, In the eastern sky the rainbow, Whispered,
Página 630 - Her silver crescent tipped with sable clouds, Conclude she bodes a tempest on the main, And brews for fields impetuous floods of rain.
Página 593 - Tremble, thou earth, at the presence of the Lord ; at the presence of the God of Jacob ; 8 Who turned the hard rock into a standing water, and the flint-stone into a springing well.
Página 449 - The Axis OF THE EARTH is an imaginary line passing through the centre of it...