Text Book to Accompany Holbrook's Scientific Apparatus |
Termos e frases comuns
Arctic Circle Asia ball black board called Cape Cape Horn Capricorn change of seasons China continent cord countries day and night diameter direction distance Diurnal Motion diurnal revolution Earth earth's axis Earth's orbit earth's surface east or west eclipse eight entire revolution equal equator equinox fixed pulleys four fourths fractions Geography Geology Geometry Hemisphere Globe Hence Herschel hour Illustration inclination wire Insert a pin Islands Jupiter larger light lines and divisions Lunarian Mars Mercury meridian miles movable pulley nine north or south north pole northern hemisphere number multiplied Numeral Frame oblate Spheroid Ocean opposite days PARALLELOPIPEDS Parallels of Latitude Planetarium planets polar circles position of places precession Proof pupil round scholar seen side sidereal sixths sphere square root succession of day Sun's teachers thousand three thirds tide tion tropic of Cancer tropic of Capricorn turn the arm turn the globe twelve twenty Venus
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Página 31 - 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.
Página 51 - It was instrumented to study the relationship between the masses of the earth and the moon, the lunar gravitational field, the interaction of the solar wind and the moon, and the characteristics of the motion of the moon in its orbit around the earth.
Página 40 - I the succession of day and night, the change of seasons, the change of the sun's declination, the different lengths of day and night, the rising of the sun north of east in summer, the changes of the moon, solar and lunar eclipses, spring and neap tides, the later daily recurrence of the tides, the length of days on the moon, the appearance of the earth to observers on the moon, the harvest moon, the difference of a synodical and sidereal revolution of the moon, the precession of the equinoxes and...
Página 40 - The most important of these phenomena are the succession of day and night ; the change of seasons ; the change of the Sun's declination ; the different lengths of day and night; the rising of the Sun north of east in summer; the changes of the Moon ; solar and lunar eclipses; spring and neap tides; the later daily recurrence of the tides...
Página 27 - Now it appears, from mensuration, that the earth is not a perfect sphere, but a spheroid, having the equatorial longer than its polar diameter.
Página 40 - This instrument is designed to illustrate all the phenomena resulting from the relations of the Sun, Moon and Earth to each other. The...
Página 31 - ... exception of the polar or north star, notwithstanding they do not change their relative position, appear to have a motion like the sun and moon, rising in the east, increasing in altitude until they approach the meridian, and declining to the western horizon, where they disappear. This apparent motion is caused by the revolution of the earth on its axis from west to east. The immovable appearance of the polar star is occasioned by the axis of the earth pointing directly to it. Its elevation above...
Página 19 - ... explanations, and copied into note books by the scholars, who will afterwards, in succession, from day to day, present it without notes on the blackboard, with definitions and explanations, subject to the criticism of the class and the teachers. "Two or more departments may be assigned to as many pupils for each day's recitation, until every scholar shall have given the whole satisfactorily. In order to economize time, one scholar, or the class at large, may be engaged in reciting the topics...
Página 42 - ... the wire in the handle ; then turn the stand so that the dividing line, between Aries and Pisces, on the horizontal circle on the large fixed pulley, shall be on the east side of the center; again, by applying the thumb and finger to the lower and movable pulley, turn the inclination wire and globe on it, so that the north pole of the globe shall be directed toward the north star. The instrument is now adjusted. If by means of the handle the arm is turned around, it will be observed, that the...
Página 26 - ... are not parallel to each other, as they would be if ^inserted perpendicularly into a plane surface. » Proof 6th. The North Star rises as we travel north, and declines as we go south till we reach the equator, when it disappears. Illustration. The globe being on a stand, let the north pole be directed toward any small object, as a nail in the ceiling. If that nail represent the north star, and a short pin a traveler, and the pin be moved from the pole toward the equator and across it, then will...