Outlines of Natural Philosophy
Outlines of Natural Philosophy
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In our eReader you can find the full English version of the book. Read Outlines of Natural Philosophy Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Outlines of Natural Philosophy
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The height represents the vertical magnetic force on one pole of a needle, the base the horizontal force, and the diagonal the total force.
808. It is not easy to make experiments on dip, or on vertical force, without very well-constructed apparatus; for if the axis of suspension, about which the needle turns, does not pass accurately through the centre of gravity of the needle, the tendency of the centre of gravity to descend will conflict with the tendency to point in the direction of magneti...c force, and the needle will assume an intermediate position.
809. Figs. 164, 165, which are taken from Airy's Treatise on Magnetism, are maps of the northern and southern hemispheres. The thin lines represent the geographical meridians (represented as straight lines), and the parallels of latitude (represented as circles). The thick lines represent the magnetic meridians meeting in the two magnetic poles A A, and a set of curves drawn through places at which the dip is the same.
310. Since a compass-needle points along the magnetic meridian, and a true north-and-south line is the same as the geographical meridian, the angle at which these two meridians cut one another is the difierence between magnetic north and true north.
What to read after Outlines of Natural Philosophy?
You can find similar books in the "Read Also" column, or choose other free books by J D Joseph David Everett to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The height represents the vertical magnetic force on one pole of a needle, the base the horizontal force, and the diagonal the total force.
808. It is not easy to make experiments on dip, or on vertical force, without very well-constructed apparatus; for if the axis of suspension, about which the needle turns, does not pass accurately through the centre of gravity of the needle, the tendency of the centre of gravity to descend will conflict with the tendency to point in the direction of magneti...c force, and the needle will assume an intermediate position.
809. Figs. 164, 165, which are taken from Airy's Treatise on Magnetism, are maps of the northern and southern hemispheres. The thin lines represent the geographical meridians (represented as straight lines), and the parallels of latitude (represented as circles). The thick lines represent the magnetic meridians meeting in the two magnetic poles A A, and a set of curves drawn through places at which the dip is the same.
310. Since a compass-needle points along the magnetic meridian, and a true north-and-south line is the same as the geographical meridian, the angle at which these two meridians cut one another is the difierence between magnetic north and true north.
What to read after Outlines of Natural Philosophy?
You can find similar books in the "Read Also" column, or choose other free books by J D Joseph David Everett to read onlineMoreLess
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