We wished to avoid the tsetse of our former path, so kept a course on the magnetic meridian from Lurilopepe.
The direction taken by a magnetic needle is parallel to the magnetic meridian.
Dr. Hooke, 1684, remarked that steel or iron was magnetized when heated to redness and placed in the magnetic meridian.
The line from the origin to M represents the magnetic meridian.
By this means the axis of the coil is brought into the magnetic meridian.
By means of two micrometer screws the inclination of the axis to the magnetic meridian and to the horizontal can be adjusted.
The dip was on the increase 89 degrees 25' and the declination swung to 40 degrees east of the magnetic meridian.
Thus a magnetic meridian lies between Fort Erie and Nottawassaga.
The upper end of the suspension is turned till the axis of the magnet is at right angles to the magnetic meridian.
Deviation of the Compass, the deflection of a ship's compass needle from the magnetic meridian, caused by adjacent iron.
|magnetic meridian |
An imaginary reference line passing through both geomagnetic poles of the Earth, used in models and maps of the Earth's magnetic field.