See photos of all shades of blue, from National Geographic.

Figure 2.1: Backlash narrows the teeth by the specified length along the pitch circle. Below the ideal gear appears in the lighter color and the darker color shows the same gear with a very large ...

Each group is color-coded. The yellow group is the easiest to figure out, followed by the green, blue, and purple groups. Pick four words and hit Submit. If you’re correct, the four words will ...