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| Using a metronome and 2 flags,Tim sends a fax over the hill
| Rex,Tim,and Percy the cat marking soggy paper
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| Another transistor loses its head to demonstrate light sensitivity
| Scanning an image by reflecting light into the transistor
| A lathe,a nail,and a telephone line - Tim and Rex build a fax modem
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| The digital reception of a fax on the other side of the hill
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| Tim tests Otis' lift safety as Rex cuts the rope
| The governor stops real lifts plummiting downward
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| Tim talks through an array of lift sensors...
| ...and risks his arm with one of them
| Rex finds out the power of hydraulics at first hand
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