## Step 9: Test Gauge

In this step we measure the opening of the gauge to make sure it maintains the 1:1.6 ratio. And we verify the gauge against known golden section architectures.

As you can see in the picture below, I've opened the gauge to a somewhat arbitrary width of 2" and measure the width on the other side of the gauge. The other side is about 3.2", which is what we expect (2" * 1.6 = 3.2").

Additionally, from the picture of the Parthenon in Greece, it is clear that the gauge accurately measures two aspects that follow the golden section.

Great Instructable. I make my guages out of wood scraps and don't put in the scissor handles (it's easier for a klutz like me) and use rivets to connect the pieces. <br> <br>I get the wood when I rip a larger piece of wood. For example, when you remove the round-over on a piece of lumber, keep the thin section. It's perfect. <br> <br>Great gifts for my math and wood working friends. <br> <br>j
I'm having trouble understanding what kind of screws you used. You said machine screws. You also said they thread directly into the plastic. Machine screws normally thread into a nut.
Charles, I must not have been clear, I will review the instructable and try to clarify. <br><br>I'm suggesting something a bit unconventional. Through my experimentation on this instructable I discovered that machine screws will thread into the right size (unthreaded) plastic hole. If you simply screw the recommended machine screw into the unthreaded 1/8&quot; hole slowly with a screwdriver by hand, it will start threading the plastic as you tighten the screw. The metal screw is able to carve the threads into the hole. Obviously, do not over tighten as you could fairly easily strip these threads that are cut...but you don't want the screw so tight anyway so it allows the pieces to move as the gauge is opened and close.<br><br>If this is confusing or if you have any trouble, you can definitely buy a tap and tap the threads in the plastic, but I found that to be an unnecessary step.
Can't wait to make this. Thanks a bunch
excellent job, greate idea,,,,
Great idea! Automates the design process. Very handy, I could use this for design &quot;on the fly&quot;.
nice 'ible and very helpful tool