(2) The rod may be placed horizontally east and west in such a position that the direction of the undeflected suspended needle bisects it at right angles.
AB is the rod and C the middle point of its axis; NS is the magnetometer needle; AM bisects the undeflected needle NS at right angles.
drawn perpendicularly to the undeflected needle from its centre of suspension.
The word usage examples above have been gathered from various sources to reflect current and historial usage. They do not represent the opinions of YourDictionary.com.