Do You Know What Replace What?

Do you know that before we are not using calculator but we used this slide rule? It is a huge ruler with a sliding section in the center; this is used so everyone can compute quickly in Math. The calculate replace the sliding rule the next few years.

Do you still remember the typewriter, we used this in college we even had a subject for this. Typewriter is machine for writing, it reproduce letters just like a printer now. It looks like a hunchback computer keyboard. Now we used the computer in replace with the typewriter.

Phonograph, it is a record player with a special needle that picks up the sound from a record. Phonograph looks like a giant black CD. Now CD replaced the Phonograph.

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