Recreations in Mathematics and Natural Philosophy ...G. Kearsley, 1803 |
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Otras ediciones - Ver todas
Recreations in Mathematics and Natural Philosophy ... Jacques Ozanam,Jean Etienne Montucla Vista completa - 1814 |
Términos y frases comunes
according altitude angle Asia astronomers axis azimuth bissextile Cayenne cent centre Christian æra circle comets consequently constellations constructed corresponding degrees describe diameter difference of longitude disk distance divided dominical letter earth eclipse employed England 51 epact equal equator example fixed stars France 49 full moon Germany given globe Gnomonics golden number height hemisphere hence horizontal dial horizontal plane hour-lines India intersect Italian hour Italy Italy 43 January Julian period Jupiter latitude libration London longitude loxodromic lunar lunations manner meridian merids method miles minutes month moon partial moon total moon's morn motion Names of places noon observed orbit parallel passing perpendicular pole PROBLEM proposed radius refraction remainder REMARK revolution rudder Saturn seen shadow shew the hours signs solar cycle style subtracted sun-dial sun's suppose surface tangent tion toises vertical dial vessel voussoirs zodiac
Pasajes populares
Página 174 - The number of days in each month may be easily remembered by committing the following lines : — « Thirty days hath September, April, June, and November ; All the rest have thirty-one, Except the second month alone, Which has but twenty-eight, in fine, Till leap year gives it twenty-nine.
Página 97 - 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.
Página 91 - 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.
Página 431 - ... placed in the water, the lead by its gravity will make the aperture tend directly downwards, and keep in a perpendicular direction the cylinder, to which fire must have been previously applied. To ascertain whether the lead, which has been added to the globe, renders its weight equal to that of an equal volume of water, rub the globe over with pitch or grease, and make a trial, by placing it in the water. The composition with which the globe must be loaded is as follows ; to a pound of grained...
Página 400 - It is evident there must be at least three rods, pierced in proportion to the diminution of the piercer, in order that the powder which is rammed in by means of a mallet, may be uniformly packed throughout the whole length of the rocket. It may be easily perceived, also, that these rods ought to be made of some very hard wood, to resist the strokes of the mallet. In loading rockets it is more convenient not to employ a piercer. When loaded on a nipple, without a piercer, by means of one massy tod,...
Página 208 - XVIII XVII XVI XV XIV XIII XII XI X IX VIII VII VI v IV III p cT W S.
Página 410 - 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...
Página 401 - These boles serve to form a communication between the body of the rocket and the vacuity at the extremity of the cartridge, or that part which has been left empty. In small rockets this vacuity is filled with granulated powder, which serves to let them off: they are then covered with paper, and pinched in the same manner as at the other extremity. But in other rockets, the pot containing stars, serpents, and running rockets, is adapted to it, as will be shown hereafter.
Página 397 - Rockets may be regarded as the grand basis of all pyrotechnical exhibitions, which are little more than modifications of their form, and of the materials of which they usually consist. A rocket is a cartridge or case made of stiff paper, which being filled in part with gunpowder, saltpetre, and charcoal, rises of itself into the air when fire is applied to it. There are three sorts of rockets : small ones, the...
Página 434 - ... 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...