From chapter 3
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From what I can tell of the quote, it means a full glass of alcohol,
"Though true cylinders without --within, the villanous green goggling
glasses deceitfully tapered downwards to a cheating bottom. Parallel
meridians rudely pecked into the glass, surround these footpads' goblets.
Fill to this mark, and your charge is but a penny; to this a penny more;
and so on to the full glass --the Cape Horn measure, which you may gulp down
for a shilling."