Electricity for public schools and colleges . Fig. Fig. lii. turned over in its stirrup, it will now lie as much to the one side ofmagnetic north and south as it before did to the other. Hence, the average position of the needle will give us the truedirection 7i in of its magnetic {see fig. iii.) D 34 ELECTRICITY CH. HI. So that if the process given in correction (i.) be applied over againwith the needle turned over in its stirrup, then the average value of8, as obtained from these/^z,rr readings, will be the true declination. [There are also other corrections not given here.] § 13.
Electricity for public schools and colleges . Fig. Fig. lii. turned over in its stirrup, it will now lie as much to the one side ofmagnetic north and south as it before did to the other. Hence, the average position of the needle will give us the truedirection 7i in of its magnetic {see fig. iii.) D 34 ELECTRICITY CH. HI. So that if the process given in correction (i.) be applied over againwith the needle turned over in its stirrup, then the average value of8, as obtained from these/^z,rr readings, will be the true declination. [There are also other corrections not given here.] § 13. Resolution of Earths total Field into two, or three,Components.—Let us first suppose that we are viewing the planeof the magnetic meridian at a place, from a position off to thewest of this place, In the diagram, VON represents the plane of the magneticmeridian ; O R represents in direction and magnitude the earths total field ; which, as we know, lies inthis plane. We can resolve this into twocomponents ; O H, or H, horizontal; OV,or V, vertical.
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Keywords: ., bookcentury1800, bookdecade1890, bookpubl, booksubjectelectricity
