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angle appear atmosphere attraction axis ball body bottom called centre of gravity centre of motion circle concave conductor consequently CONVERSATION convex convex lens copper degrees descend diameter direction distance diurnal motion earth ecliptic electricity equal equator experiment fall feet fixed stars fluid force fulcrum glass globe greater heat heavens hygrometer inch inclined plane iron kind length lens less lever Leyden jar light machine magnet marble means mechanical powers mercury metals millions of miles minutes moon move multiplied nearer object observe orbit ounces papa particles pass perpendicular piece planets polar polar circles poles pound pound weight pressure principle produced proportion pulleys quantity quicksilver rays refraction retina rise round Saturn screw seen side space specific gravity square substance suppose surface tube turn valve velocity vessel weight wire
Page 298 - ... 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.
Page 113 - Annual for me, the grape, the rose renew The juice nectareous, and the balmy dew; For me, the mine a thousand treasures brings; For me, health gushes from a thousand springs; Seas roll to waft me, suns to light me rise; My foot-stool earth, my canopy the skies.
Page 97 - This alteration took place through the greater part of Europe, and the year was afterwards called the Gregorian year, or New Style. In this country, the method of reckoning, according to the New Style, was not admitted into our calendars until the year 1752, when the error amounted to nearly 11 days, which were taken from the month of September, by calling the 3d of that month the 14th.
Page 99 - Shedding sweet influence. Less bright the moon, But opposite in levell'd west was set His mirror, with full face borrowing her light From him, for other light she needed none In that aspect, and still that distance keeps Till night ; then in the east her turn she shines...
Page 106 - The attraction of the sun and moon upon the waters of the ocean. The moon being nearest to the earth, her attraction is six times greater than that of the sun. This attraction of the moon raises the waters of the ocean as they come under her influence by the motion of the earth on its axis.
Page 260 - ... will slide on towards the narrow end, less or more, according to the degree of heat to which it has been exposed*. Each degree of Mr. Wedgewood's thermometer answers to 130 degrees of Fahrenheit, and he begins his scale from red heat fully visible in daylight, which he finds to be equal to 1077° of Fahrenheit's scale, if it could be carried so high.
Page 284 - A lens is glass ground into such a form, as to collect or disperse the rays of light which pass through it. These are of different shapes, and from thence receive different names.
Page 300 - When the object is more remote from the mirror than its centre of concavity C, the image will be less than the object, and between the object and...
Page 43 - ... to his strength; which is done by so dividing the beam they pull, that the point of traction may be as much nearer to the stronger horse than to the weaker, as the strength of the former exceeds that of the latter. To this kind of lever may be reduced...