Scientific Amusements in Philosophy and Mathematics: Including Arithmetic, Acoustics, Electricity, Magnetism, Optics, Pneumatics : Together with Amusing Secrets in Various Branches of Science, the Whole Calculated to Form an Agreeable and Improving Exercise for the Mind

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A. K. Newman, 1821 - 276 Seiten
 

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Seite 190 - To the top of the upright stick of the cross is to be fixed a very sharp pointed wire, rising a foot or more above the wood. To the end of the twine, next the hand, .is to be tied a silk ribbon, and where the silk and twine join a key may be fastened.
Seite 238 - In ten or twelve hoiirs afterwards, if the weather be warm, the earth will swell up and burst, and flames will issue out> which will enlarge the aperture, scattering around a yellow and blackish dust. It is not impossible, that what is here seen in miniature takes place on a grand scale in volcanoes ; as it is well known that they always, furnish abundance of sulphur, and also metallic substances.
Seite 191 - At this key the phial may be charged; and from electric fire thus obtained, spirits may be kindled, and all the other electric experiments be performed, which are usually done by the help of a rubbed glass globe or tube, and thereby the sameness of the electric matter with that of lightning completely demonstrated.
Seite 183 - Two small hemispheres of wood are then fixed with cement to the middle of the upper and under sides, centrally opposite, and in each of them a thick strong wire eight or ten inches long, which together make the axis of the wheel. It turns horizontally on a point at the lower end of its axis, which rests on a bit of brass cemented within a glass saltcellar. The upper end of its axis passes through a hole in a thin brass plate cemented to a long...
Seite 13 - That is, in any proportion, either extreme is equal to the product of the means divided by the other extreme; and either mean is equal to the product of the extremes divided by the other mean.
Seite 115 - The head of a fish is 7 inches long, the tail is as long as the head and |- of the body, and the body is as long as the head and tail ; what is the length of the fish ? 9.
Seite 190 - As soon as any of the thunder-clouds come over the kite the pointed wire will draw the electric fire from them, and the kite, with all the twine, will be...
Seite 74 - It may be readily seen, that the pieces, instead of being in the two hands of the same person, may be supposed to be in the hands of two persons, one "of whom has the even number, or piece of gold, and the other the odd number, or piece of silver. The same operations may then be performed in regard to these two persons, as are performed in regard to the two hands of the same person, calling the one privately the right, and the other the left.
Seite 31 - ... farthing for the first nail, two for the second, four for the third, and so on to the twenty-fourth.
Seite 72 - ... four, 555; and so on; for the remainder will be composed of figures of which the first on the left will be the first number thought of, the next the second, and so on.

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