...which passes through the north and south magnetic poles. There are places where the magnetic meridian coincides with the terrestrial meridian ; in these...north and south, are called lines of no variation, and are extremely complicated. The direction of the needle is not even constant in the same place, but...

...which passes through the north and south magnetic poles. There are places where the magnetic meridian coincides with the terrestrial meridian ; in these...north and south, are called lines of no variation, and are extremely complicated. The direction of the needle is not even constant in the same place, but...

...which passes through the north and south magnetic poles. There are places where the magnetic meridian coincides with the terrestrial meridian ; in these...few years according to a law not yet determined. In 1657, the line of no variation passed through London; from that time it has moved slowly, but irregularly,...

...which passes through a north and south magnetic pole. There are places where the magnetic meridian coincides with the terrestrial meridian. In these...no variation, and they are extremely complicated. Lines drawn through all those places where the needle deviates from the geographical meridian by an...

...obliged to make allowances for these variations in their reckonings. The lines drawn on the globe through places where the needle points due north and south are called lines of no variation. One line of no variation runs from the north magnetic pole through Washington, and through Bahia in...

...direction will deviate, sometimes to the east, and sometimes to the west of the true north. Imaginary lines drawn on the globe through all the places where...north and south are called lines of no variation. Imaginary lines drawn through all those places where the needle deviates from the geographical meridian...

...direction will deviate, sometimes to the east, and sometimes to the west of the true north. Imaginary lines drawn on the globe through all the places where...north and south are called lines of no variation. Imaginary lines drawn through all those places where the needle deviates from the geographical meridian...

...it. This tendency to change is termed the variation of the needle, and was noticed in the year 1500. Lines drawn on the globe through all the places where...no variation, and they are extremely complicated. Again, an unmagnetized needle, suspended so as to be freely movable in a vertical plane, (that is,...

...there to be a divergency between the poles (if rotation and those of terrestrial magnetism. — AUTHOR. suspended, points to the true north ; but, if it be...variation, and they are extremely complicated. ..... " The needle is also subject to diurnal variations. In our latitudes it moves slowly westward during the...

...direction will deviate sometimes to the east and sometimes to the west of north. Lines drawn on the glohe, through all the places where the needle points due...variation, and they are extremely complicated " The needle is also suhject to diurnal variations. In our latitudes it moves slowly westward during the...