FROM time to time accounts appear of experiments on new kinds of steel which have been undertaken with the object of determining the most suitable material from which to construct a permanent magnet.

The mechanism that reads and writes magnetic tape as it moves past. Quality tape recorders have three heads: play (read), record (write) and erase. Many consumer products have only two: one that plays ...

The computer's storage media prior to solid state drives (SSDs). Magnetic tape and disks were developed in the 1950s and commonly used together in companies for decades. Tape was the primary medium ...