The pendulum is a neodymium magnet on the head of a bolt, dangling on a one foot aluminium chain. Below, a Hall Effect sensor rests atop an electromagnet — 1″ in diameter, with 6/8″ wire ...

He noticed that he could keep the pendulum moving at a pretty good tick if he triggered the magnetic coil every third pass, so he implemented an Arduino to keep count of passes and apply the ...

Geologists use the discipline of paleomagnetism to measure the Earth's magnetic field as it existed millions of years ago. When molten rock cools, magnetic minerals align with the planet's magnetic ...

A 1.5 inch diameter wooden ball is suspended by a string from a bar attached to a magnet which sticks to the blackboard. The maximum length of the string possible with our blackboards is 90 cm. Mark ...

When the pendulum cable reaches a particular point in its swing, it is detected by an electronic device and the magnet is turned on at just the right time to give the collar (and thus the cable and ...

Self-identifying hammers are mounted to the frame with a quick change connector and their speed is electronically measured by means of a magnetic, non-contacting encoder. Additionally, a transparent ...