Scientific Dialogues: Intended for the Instruction and Entertainment of Young People: in which the First Principles of Natural and Experimental Philosophy are Fully ExplainedScott, Webster and Geary, 1841 - 495 pages |
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Common terms and phrases
air-pump angle appear ascer atmosphere attraction axis ball body bottom called centre of gravity circle conductor consequently CONVERSATION convex convex lens degrees diameter direction distance diurnal motion earth ecliptic electric fluid Ephemeris equal equator experiment explain fall feet figure fixed stars force fulcrum glass globe grains greater heat heavens heavier hydrometer inches inclined plane kind length less lever light magnet marble means mechanical power mercury millions of miles minutes moon move multiplied nearer object observe orbit ounces papa particles pass perpendicular piece pipe piston planets polar circles pole pound pound weight pressure principle proportion pulleys pump quantity quicksilver rays refraction retina rise round Saturn screw seen shew shewn side space specific gravity square stand substance superior planets suppose surface tion tube turn valve velocity Venus vessel weight
Popular passages
Page 364 - Thus with the year Seasons return ; but not to me returns Day, or the sweet approach of even or morn, Or sight of vernal bloom, or summer's rose, Or flocks, or herds, or human face divine ; But cloud instead, and everduring dark Surrounds me, from the cheerful ways of men Cut off, and for the book of knowledge fair Presented with a universal blank Of nature's works, to me expunged and rased, And wisdom at one entrance quite shut out.
Page 120 - evidence of things not seen," in the fulness of Divine grace ; and was profound on this, the greatest concern of human life, while unable even to comprehend how the " inclination of the earth's axis to the plane of its orbit" could be the cause of the change of the seasons.
Page 46 - Powers, are certain simple instruments, commonly employed for raising greater weights, or overcoming greater resistances, than could be effected by the natural strength without them. These are usually accounted six in number, viz. the Lever, the Wheel and Axle, the Pulley, the Inclined Plane, the Wedge, and the Screw.
Page 334 - ... 1. The rising of the mercury presages, in general, fair weather ; and its falling foul weather, as rain, snow, high winds, and storms.
Page 226 - It is not so generally known as it ought to be, that the...
Page 87 - The Ram, the Bull, the heavenly Twins, And next the Crab the Lion shines, The Virgin and the Scales ; The Scorpion, Archer, and He-goat, The Man that holds the watering-pot, And Fish with glittering tails.
Page 118 - The reason of the difference between the solar and sidereal day is, that as the earth advances almost a degree eastward in its orbit, in the same time that it turns eastward round its axis, it must make more than a complete rotation before it can come into the same position with the sun that it had the day before...
Page 57 - ... proportion as the circumference of the wheel is greater than that of the axle. If the...
Page 325 - ... ascertained. The fire, according to its heat, contracts the earthy body, so that, being applied to the wide end of the gauge, it will slide on towards the narrow end, less or more, according to the degree of heat to which it has been exposed.* ' We have in the former parts of this work observed, that all bodies are expanded by heat.
Page 373 - ... as the angle of reflection is always equal to the angle of incidence, the image for any point can be seen only in the reflected ray prolonged.