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to markers with fatter tips or writing instruments that require more downward
pressure. The vertical orientation is usually the best choice when making plots
where you will need to switch between pens (for example with different colors)
while maintaining the pen in the same location.
8.3 Inserting a pen
You can insert a pen – or other writing instrument that you are using – into the
pen clip and tighten it in place with the thumbscrew.
Take care to only apply
gentle force
with the thumbscrew: You need merely to
immobilize the pen, so stop turning once you encounter moderate resistance.
When using any ink-based pen (whether rollerball, fountain pen, or permanent
maker), it is helpful to “bleed” out the tip before writing. Try it by hand on a piece
of scratch paper, and make sure that ink is actually flowing.
Note on fragile or delicate pens:
If you choose to use fragile pens (such as high-
end fountain pens with celluloid barrels), exercise great care when inserting the
pen. You may wish to wrap the barrel in a thin, soft cloth to avoid scratching, and
use little or no pressure from the thumbscrew. Moderately priced fountain pens,
like the Lamy Safari shown above, tend to be quite tough, and require little special
treatment.
