When a British ship passed over it, the mass of the ship caused the magnetic needle inside the mine to move slightly.
12.
The author of " The Magnetic Needle of Islam ", Ma Chu ( 1630 1710 ), was a descendant of Sayyid Ajall.
13.
In the subsequent experiments, Garzoni studies the external diffusion of magnetic virtue by displacing a magnetic needle within the sphere of action.
14.
The device consisted of two circular boxes, similar to compasses, each with a magnetic needle, supposed to be magnetized by the same lodestone.
15.
The brittle magnetic needle stopped moving in the compass liquid within four seconds as opposed to up to 30 seconds in older compasses.
16.
The magnetic equator is an imaginary line around the planet that connects all the points where a magnetic needle, when freely suspended, is horizontal.
17.
Hood also gave an account of the diurnal variation of the magnetic needle and its correction, and a description of a new surveying instrument.
18.
For most of Chinese history, the compass that remained in use was in the form of a magnetic needle floating in a bowl of water.
19.
However, his experiments did not deal with electric currents, and only showed that an electrostatic charge from a voltaic pile could deflect a magnetic needle.
20.
On the transplanted flesh was tattooed an alphabet whereby, by pricking the letters with a magnetic needle, the users believed they could communicate instantaneously across great distances.
