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The Magic School Bus is a series of children's books about science, written by Joanna Cole and illustrated by Bruce Degen.Designed for ages 6-9, they feature the antics of Ms. Valerie Felicity Frizzle and her class, who board a sentient anthropomorphic mini school bus which takes them on field trips to impossible locations, including the solar system, clouds, the past, and the human body.
The magnet was made of 18 turns of bare copper wire (insulated wire had not yet been invented). [1] William Sturgeon (/ ˈ s t ɜːr dʒ ə n /; 22 May 1783 – 4 December 1850) was an English electrical engineer and inventor who made the first electromagnet and the first practical electric motor.
Geomag, stylized as GEOMAG, is a magnetic construction toy consisting of a collection of bars, each set with a neodymium alloy magnet at both ends, connected by a magnetic plug coated with polypropylene, and nickel-coated metal spheres. These elements interlock using magnetism, allowing for them to be assembled in various ways.
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A magnetic gear is composed of magnets of the type permanent, electromagnetic or otherwise magnetically induced fields. It consists of two or more elements that are usually rotating but can be linear or curve linear in nature. The classical gear is defined as a ratio of pole pairs. Where the Pole pairs are magnets N-S and S-N in nature.
One of the earliest known references to lodestone's magnetic properties was made by 6th century BC Greek philosopher Thales of Miletus, [12] whom the ancient Greeks credited with discovering lodestone's attraction to iron and other lodestones. [13]
The idea that the legend of Magnes the shepherd could be the origin of magnet, et al., and the legend itself has been criticized. Pliny's story is characterized in Gillian Turner's book North Pole, South Pole: The Epic Quest to Solve the Great Mystery of Earth’s Magnetism (2011) as "no doubt embellished by centuries of retelling."
The machine illustrated here uses eight disks and nine rows of magnets: 72 magnets in all. The rotors first used were wound as sixteen axial bobbins, one per pole. Compared to the bipolar dynamo, this did have the advantage of more poles giving a smoother output per rotation, [ note 2 ] which was an advantage when driving arc lamps.
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