Recreations in Mathematics and Natural Philosophy ...Longman, Hurst, Rees, Orme, and Brown, 1814 |
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according angle arch armillary sphere Asia astronomical axis bissextile calibre cartridge centre charcoal Christian æra circle circumference comets composition consequently constructed corresponding curve degrees describe diameter direction distance divided dominical letter earth eclipse employed epact equal equator equinoctial example feet fire fixed stars given globe Gnomonics golden number gunpowder height hemisphere horizontal dial horizontal plane hour-lines inches Italian hour Julian period Jupiter kind latitude length London longitude loxodromic lunar manner means meridian method minutes month moon partial moon total moon's morn motion necessary noon observed orbit ounces parallel passing perpendicular piece points of division pole pounds powder PROBLEM proposed radius remainder rocket rudder saltpetre Saturn seen shadow show the hour side signs solar cycle square style subtracted sulphur sun's superficial content suppose surface tangent thickness tion toises velocity vertical dial vessel voussoirs wind zodiac
Populære passager
Side 89 - But since the mean synodic motion of the moon is at the rate of 30" per minute, it follows that the duration of a total solar eclipse can never exceed four minutes.
Side 95 - One place also is higher than another, or out of level with it, when it is farther from the centre of the earth ; and a line equally distant from that centre in all its parts, is called the line of true level.
Side 4 - ... stars. But, as the earth advances almost a degree eastward in its orbit, in the time that it turns eastward round its axis, whatever star passes over the meridian on any day with the sun, will pass over the same meridian on the next day, when the sun is almost a. degree short of it ; that is, 3 minutes, 56 seconds sooner.
Side 315 - But this is not the case in a beam of timber: for, by tracing the process of vegetation, it has been found that the ligneous coats of a tree, formed by its annual growth, are almost concentric ; and that they are like so many hollow cylinders thrust into each other, and united by a kind of medullary substance which offers but little resistance : these hollow cylinders, therefore, furnish the chief resistance to the force which tends to break them.
Side 386 - ... it ought to be put into a large iron mortar, and to be loaded with a quantity of powder proportioned to the weight of the globe. This small mortar must be of light wood, or of paper pasted together, and rolled up in the form of a cylinder, or truncated cone, the bottom excepted ; which, as already said, must be of wood. The chamber for the powder...
Side 370 - ... a portion of it must be pinched in that part of the cylinder which has the least diameter : this part must be pared in such a manner, as to leave only what is necessary for making the pot fast to the top of the rocket, and the ligature must be covered with paper. To charge such a pot, attached to a rocket : having pierced three or four holes in the double paper which covers the vacuity of the rocket, pour over it a small quantity of the composition with which. the rocket is filled, and by shaking...
Side 367 - ... of the rocket. It must however be observed, that rockets of this kind will not keep longer than a week ; because the moisture contracted by the saltpetre rusts the iron-filings, and destroys the effect they are intended to produce. But the Chinese have long been in possession of a method of rendering...
Side 366 - At the moment when the powder begins to inflame, its expansion produces a torrent of elastic fluid, which acts in every direction ; that is, against the air which opposes its escape from the cartridge, and against the upper part of the rocket ; but the resistance of the air is more considerable than the weight of the rocket, on account of the extreme rapidity with which the elastic fluid issues through the neck of the rocket to throw itself downwards, and therefore the rocket ascends by the excess...
Side 116 - Hence he concludes, that the sun has a very extensive atmosphere, which consists of elastic fluids that are more or less lucid and transparent ; and of which the lucid ones furnish us with light. This atmosphere, he...
Side 393 - Three or four suns, with horizontal axes passed through them, might be implanted in a vertical axis, moveable in the middle of a table. These suns, revolving around the table, will seem to pursue each other. It may be easily perceived that, to make them turn around the table, they must be fixed on their axes, and these axes, at the place where they rest on the table, ought to be furnished with a very moveable roller.