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.
According to the 2015 PDK / Gallup Survey of the Public âs Attitudes Toward the Public Schools , 64 percent of Americans ( and 67 percent of public school parents ) say there is â too much emphasis on testing. â Only 14 percent rated standardized testing as a â very important â factor in measuring school effectiveness , and 55 percent ( 66 percent ...