Cyclomathesis: Or, An Easy Introduction to the Several Branches of the Mathematics]., المجلد 91770 |
عبارات ومصطلحات مألوفة
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مقاطع مشهورة
الصفحة 44 - VARIOUS opinions have been held by ancient as well as modern philosophers, respecting the origin of springs and rivers ; but the true cause is now pretty well ascertained. It is well known that the heat of the sun draws vast quantities of vapour from the sea, which, being carried by the wind to all parts of the globe, and being converted by the cold into rain and dew...
الصفحة 51 - B the south point. Through A and B draw the perpendiculars CD, EF, for the extreme parallels of latitude. Divide AB into 8 parts, or degrees, through which draw the other parallels of latitude, parallel to the former. For the meridians, divide any degree in AB into 60 equal parts, or geographical miles.
الصفحة 51 - A, viz. 43 1 nearly ; which set off, from A, 7 times to C, and 6 times to D. Then from the points of division in the line CD, to the corresponding points in the line EF, draw so many right lines for the meridians. Number the degrees of latitude up both sides of the map, and the degrees of longitude on the top and bottom. Also, in some vacant place, make a scale of miles, or of degrees, if the map represent a large part of the earth, to serve for finding the distances of places upon the map.
الصفحة 82 - Maurusii, vel Mauri, were inhabitants of Mauritania, an extensive country in Africa, bounded on the west by the Atlantic ocean, on the north by the Mediterranean sea, and on the east by Numidia and Carthage. It seems this news...
الصفحة 117 - Bring the given ftar to the upper femicircle of the brafs meridian, and fet the index to the given hour; then turn the globe, until the index points to...
الصفحة 116 - ... or in the gulf of California ? How much ? 9. What places have 6 o'clock AM when it is noon. at the Falkland islands ? 10. When it is noon at Lisbon, at what places is it 8 o'clock in the afternoon, and at what places is it 6 o'clock in the forenoon ? 232. PROB. VIII. — To find the antipodes of any place. Bring the given place to the meridian, and find its latitude ; set the index to 12, and turn the globe till the index points to the other 12 ; then the same degree of latitude on the other...
الصفحة 79 - It is bounded on the eaft by the Mediterranean, on the weft by Portugal and the Atlantic Ocean, on the north by France and the Bay of Bifcay, on the fouth by the Atlantic Ocean and part of the Mediterranean.
الصفحة 48 - First, a map of the world must represent two hemispheres : and they must both be drawn upon the plane of that circle which divides the two hemispheres. The first way is to project each hemisphere upon the plane of some particular circle, by the rules of orthographic projection, forming two hemispheres upon one common base or circle. When the plane of projection is that of a meridian, the maps will be the east and west hemispheres, the...
الصفحة 53 - When the place is but small that a map is to be made of, as if a country were to be exhibited, the meridians, as to sense, will be parallel to one another, and the whole will differ very little from a plane. Such a map will be made more easily than by the preceding rules. It will here be sufficient to measure the distances of places in miles, and so lay them down in a plane rectangular map.