The harder the lead, the lighter the line. Soft, dark lead smudges and breaks more easily than hard lead. Selecting the best lead is usually a compromise, but a good starting point is either F or HB lead. We will use the lettering style on page 81. Either vertical or inclined lettering is acceptable, but don't mix both styles on one sheet.
Most students use vertical lettering.
You must always draw guidelines for your lettering, and these guidelines must not be erased. You may use a straightedge for guidelines only. Many students use a template for making guidelines. The best option is the required rolling ruler. You should disregard the numbers and arrows on the textbook examples.