A full gill of whale oil! Unless it’s exceptionally hot out.
And of course we wore an onion on our belt in those days, it being the fashion…
Edit: I actually own an elaborate whale oil lamp. It is the most aweful example of Victorian “taste” I have ever seen, which is why I cannot seem to throw it away. It’s hideous and lives in an obscure corner of the barn, so as not to accidentally damage anyone’s eyeballs or psyche.
Edit2: Damn, that got off topic fast.