This is the simplest/ easiest way that I could think of, of making a large compass. Enjoy!
Watch the video, or scroll below for all the steps.
Step 2: Gather Materials
Gather 2 pieces of identical length wood for the 'beam', and 2 identical pieces for the inner channel. Also two misc sized pieces for the pencil hole. The sizes you choose dont matter, just as long as they are the same.
Step 3: Glue the Small Pieces on Either Inner End of the Long Stick.
Step 4: Create a Sandwich the Next Long Piece - Using Glue to Adhere Them Together
Step 5: Drill a Hole Into the Pencil Holder
Step 6: Attach the Pencil Holder to the Rest of the Body of the Compass
Step 7: Find a Bolt With a Pointy End and a Bolt + Washer
Step 8: The Final Step
Stick bolt and nut through channel, and pencil in hole- the ruler is now ready for use!