Magnetic Storage. Piano wire, an electromagnet and a microphone. This was all the Danish inventor Valdemar Poulsen (1869-1942) needed in 1898 to create the telegraphone or wire recorder â the first known device capable of recording sound magnetically.agnetic Storage. Piano wire, an electromagnet and a microphone. This was all the Danish inventor Valdemar Poulsen (1869-1942) needed in 1898 to create the telegraphone or wire recorder â the first known device capable of recording sound magnetically.
And as of 2016, there are about 2.3 million home-schooled students in the United States (Brian, 2016). The studies found that of these children, 83 percent were White, 5 percent were Black, 7 percent were Hispanic, and 2 percent were Asian or Pacific Islander.
The U.S. is still home to more Christians than any other country in the world, and a large majority of the country identify with that faith. But the percentage of adults who call themselves Christian fell to 71% in 2014, down from 78% in 2007. Over the same period, the percentage of Americans who identify as atheist, agnostic or say they are ânothing in particularâ climbed to 23% from 16%, the survey found.