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.
While blacks make up 18 percent of students in preschool, they account for 42 percent of students with an out-of-school suspension and 48 percent of students with multiple out-of-school suspensions. Black Americans are suspended and expelled at three times the rate of white students. They make up 16 percent of school enrollment, but account for 32 percent of students who receive in-school suspensions, 42 percent of students who receive multiple out-of-school suspensions and 34 percent of students who are expelled.