1
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Hi. Are you Mr. Harding?

2
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Yes, that's right. You must be one of the treehouse detectives.

3
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Dr. D tells me you need to learn more about safety.

4
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That's right. Dr. D mentioned that you rock climb.

5
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We were wondering how you make it safe.

6
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Well, I can show you that right here.

7
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But first we need to outfit you with the climbing harness to tie the rope into you.

8
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You aren't going to pull me up, are you?

9
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No, you're going to have to do the climbing yourself.

10
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The rope is just simply there to keep you safe.

11
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How does that work?

12
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It's called belaying.

13
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I tie one end of the rope into your harness, and then it goes through the eye bolt at the top,

14
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and then down to me, the belayer.

15
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It passes through this belay device called an ATC or figure eight.

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If you slip and begin to fall, I simply pull on the rope like this,

17
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and the friction with the ATC stops the rope.

18
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Are you sure this is going to work?

19
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Let me show you.

20
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Climb up a few feet and then let go.

21
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Okay.

22
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Wow, it stopped me right away.

23
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I told you it would.

24
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Another important safety feature is the type of rope we're using.

25
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It's called a dynamic rope because it has stretch to it.

26
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That way you don't stop too suddenly.

27
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You want to try some rappelling?

28
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What's that?

29
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Let me have my son demonstrate.

30
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It looks like he used the same device that you used to belay me.

31
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That's right. I have a belay attached to him to keep him safe.

32
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I'll bet we could use the belay principle as a safety device for a lift chair.