1. instruments that automatically record variations in the Earth’s magnetic field
Usage: scientific; plural form

Examples

• The observatory installed several magnetographs to monitor geomagnetic activity.
• Scientists use magnetographs to study magnetic storms and their effects.
• The magnetographs detected unusual fluctuations in the magnetic field last night.
• Modern magnetographs can record data continuously for months without interruption.
• Researchers compared readings from magnetographs around the world to track the solar storm.
• The university’s magnetographs help predict space weather conditions.