From: "John Beamish" 

More likely they were marks made by the proofreader examining the galley
proofs.  One underline shows the text to affected, "ital" in the
margin says "Italics".  Two underlines shows the text and
"SC" (or was it "small"
-- can't remember) is small caps.  Three lines and caps is, as expected,
all capitals.

Done with a blue pencil (I don't know why).

I remember my dad doing that on a number of occasions.

On Tue, 02 Jan 2007 11:48:09 -0500, Gary Britt
 wrote:

> It probably relates back to the old "proof reader/book editor"
> conventions used in the pre-computer days for manually marking revisions
> to text to be made by the typing pool/secretary.
>
> Gary
>

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