19 votes

Mechanical Pencil — An illustrated celebration of the engineering around us

1 comment

  1. thenetnetofthenet
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    the illustrations are great, but I'm also a fan of the writing style. From the Pilot G2:

    the illustrations are great, but I'm also a fan of the writing style.

    From the Pilot G2:

    Click! Click! Retractable pens feature a very clever mechanism called a "push-push" mechanism. This type of mechanism exists in many forms: old push light switches, cabinet latches, sim card readers, and more. But this is probably the most recognizable implementation.

    The main question: why does the pen tip press out when you push the pen down, but the pen tip retracts when you push down again? Let's get into it.

    4 votes