A New Treatise on the Use of Globes: With Notes and Observations, Containing an Extensive Collection of the Most Useful Problems, Illustrated by a Suitable Variety of Examples. Designed for the Use of Schools and Academies

Εξώφυλλο
E.J. Coale; Benjamin Edes, Printer, 1826 - 215 σελίδες
 

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Σελίδα 123 - Rectify the globe for the latitude of the place, find the sun's place in the ecliptic and bring it to the brass meridian, and set the index of the hour circle to 12. Turn the globe westward till the sun's place...
Σελίδα 142 - Set the index of the hour circle again to twelve, and turn the globe on its axis till the index has passed over twelve hours ; then to all places above the horizon the eclipse will be visible ; to those places along the western edge of the horizon the moon will rise eclipsed ; to those along the eastern edge she will set eclipsed ; and to that place immediately under the sun's declination the moon will be vertically eclipsed.
Σελίδα 69 - If both the places be situated on the same parallel of latitude, their bearing is either east or west from each other ; if they be situated on the same meridian, they bear north and south from each other ; if they be situated on the same rhumb-line, that rhumbline is their bearing : if they be not situated on the same rhumb-line, lay the quadrant of altitude over the two places, and that rhumb-line which is the nearest of being parallel to the quadrant will be their bearing.
Σελίδα 65 - Lay the graduated edge of the quadrant of altitude over the two places, so that the division marked 0 may be on one of the places, then observe what degree of the quadrant stands over the other place ; move the quadrant entirely round, keeping the division marked 0 in its first situation, and all places which pass under the same degree which was observed to stand over the other place, will be those sought. OR, Place one foot of a pair of compasses in one of the given places, and extend the other...
Σελίδα 175 - Bring the sun's place in the ecliptic for the given day to the meridian, and set the index to XII. at noon : turn the globe westward till the index points to the given hour ; then the surface of the globe represents the exact face of the heavens at the given place.
Σελίδα 97 - Find the sun's declination and elevate the north or south pole, according as the declination is north or south so many degrees above the horizon, as are equal to the sun's declination ; bring the given place to the brass meridian, and set the index of the hour circle to 12.
Σελίδα 92 - ... the equator, the days are decreasing. The sun's meridian altitude for any day may be found by counting the number of degrees from the parallel in which the sun is on that day, towards the horizon, upon the brass meridian ; thus, when the sun is in that parallel of latitude which is ten degrees north of the equator, his meridian altitude will be 48 J- degrees.
Σελίδα 102 - Find the latitude of the given place, and elevate the north or south pole, according as the latitude is north or south, the same number of degrees above the horizon ; bring the middle of the analemma to the brass meridian, and set the index of the hour circle to twelve ; turn the globe westward till the day of the month on the analemma comes to the western semi-circle of the horizon, and the number of hours passed over by the index, will be the time of the sun's setting, &c. as above. Examples. 1....
Σελίδα 105 - XX.) bring it to the brass meridian, and observe the degree above it ; turn the globe on its axis till some other point of the ecliptic falls under the same degree of the meridian : find this point of the ecliptic on the horizon, and directly against it you will find the day of the month required. This Problem may be performed by the celestial globe in the same manner.
Σελίδα 83 - Find the longitude of the given place on the equator, bring it to that part of the brass meridian which is numbered from the equator towards the poles ; and then, under the given latitude, on the brass meridian, you will find the place required.

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