Entra in un mondo di storie
Non-fiction
Please note: This is a companion version & not the original book. Book Preview:
#1 The telegraph, a system of sending messages or information to a distant place, was invented in 1746. It was a big deal because it suggested that it should be possible to harness electricity to build a signaling device that could send messages over great distances incomparably faster than a human messenger could carry them.
#2 In 1617, Famianus Strada, a learned Italian, wrote a book explaining how two needles could be touched with a lodestone and then balanced on separate pivots, and the one turned in a particular direction would cause the other to sympathetically move parallel to it.
#3 The story of the magic needles was based on a germ of truth: there are naturally occurring minerals called lodestones that can be used to magnetize needles and other metallic objects. However, these did not exist in the form described by Strada.
#4 Chappe's telegraph was a series of wooden panels that could be flipped from black to white as the second hand passed over a particular number. The messages were sent over very great distances very quickly, and a telescope was used to observe the panels.
© 2022 IRB Media (Ebook): 9798822515376
Data di uscita
Ebook: 13 maggio 2022
Tag
Più di 400.000 titoli
Kids Mode (accesso sicuro per bambini)
Scarica e ascolta offline
Disdici quando vuoi
Per te che non sei un avido ascoltatore.
1 account
10 ore/mese
Disdici quando vuoi
La scelta migliore per 1 utente. Ascolta e leggi quanto vuoi.
1 account
Ascolto illimitato
Disdici quando vuoi
12 mesi al prezzo di 9. Ascolta e leggi quanto vuoi.
1 account
Ascolto illimitato
Disdici quando vuoi
Storie per tutta la famiglia. Entrate insieme in un mondo di storie.
2 account
Ascolto illimitato
Disdici quando vuoi
Italiano
Italia