You can draw straight lines on the globe. This is usually hard to do. You can't use a ruler on a curved surface. However, your globe sits in a cradle that has a ring around it. This ring is the Horizon Ring.
Because your globe sits halfway on this cradle, you can draw a straight line from one place to another.
A straight line on a globe is important because it shows true direction.
The picture below shows how you can use the globe and the mounting to do this.
Step 1
Circle any two cities, say Chicago and Moscow.
Step 2
Place your left thumb on Chicago and your right on Moscow.
Step 3
Move the globe forward until Chicago and Moscow are even in the Horizon Ring.
Step 4
Draw a line, using the Horizon Ring as a straight edge connecting the two cities.