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As early as 1966, with the introduction of the first computerized word-processing system (I.B.M.’s Magnetic Tape Selectric Typewriter), secretaries were worrying that machines could replace them.

早在1966年，随着计算机化的文字处理机(I.B.M.磁带式自动打印机)的出现，秘书们就开始担心机器会代替他们，他们不再需要因为漏打一个字母而重新再打一页。

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Through the introduction of magnetic vector potential, the mathematical model of electromagnetic field and eddy current field was established.

其中，电磁场和涡流场的数学模型是通过引入复矢量磁位而建立的。

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Before the introduction of magnetic tape, digital storage for early computers used punched cards, paper tape as well as more exotic technologies such as mercury delay lines and the phosphors on cathode ray tubes.

FORBES: Magnetic Tape Turns 60

Much of these increases in storage capacity will involve the introduction of technologies pioneered in the development of magnetic disk drives.

FORBES: Magnetic Tape Turns 60

However with the introduction of lighter weight and more flexible plastic substrate magnetic tapes, combined with a vacuum column to control the tension that the magnetic tape experiences during use, the IBM 726 was a prototype of the modern digital tape recording system.

FORBES: Magnetic Tape Turns 60