But this fact that an electro-magnet would set a tuning-fork humming was new to Bell and very attractive.
He brought Bell to his house and showed him what Helmholtz had done--how he had kept tuning-forks in vibration by the power of electro-magnets, and blended the tones of several tuning-forks together to produce the complex quality of the human voice.
The electricity produced passes forward, where it works, by electro-magnets
of great size, on a system of levers and cog-wheels that transmit the movement to the axle of the screw.
At one of the stores the tobacco had been hidden in a secret compartment behind a shelving unit that could only be opened using an electro-magnet
However, since the main component of an electro-magnet
is a coil of copper wire, we were shown a perfunctory diagram of a coil winding machine on the blackboard.
Considering the lag of the proportional electro-magnet
, pressure sensor, converting time between the signals, it is time-consuming and can't meet the requirement of the system.
- switch on the electro-magnet
and build a magnetic sculpture from pieces of iron.
It has a strong electro-magnet
(or induction coil) positioned just under the ceramic cooking zones.
The BBE extracts the battery from the truck onto its on-board roller bed using a powerful extending electro-magnet
and then pushes the battery into place for charging.