Harlow leaves no doubt about his claim to have sung "Columbo" on board "Akbar" in 1876-77. After noting that the words of "The Hog-eye Man" were "of the vilest" (and printing a bowdlerized version), he goes on to say:

"Another chantey that [Brooks] sang was of the same sort. He said it was sung by sailors in the navy, not as a chantey but as a fo'c'sle songs, but we sang it at the pumps as it fitted the time of the pump brakes monotonously working up and down."

Harlow's tune for "Christopher Columbus" is a little unusual but clearly resembles the one sung by, e.g., Oscar Brand.

Cf. these two clumsily bowdlerized stanzas with D above, stz. 10:

Now Chris has brought his monk aboard,
The monkey's name was Jumbo,
And all on board they liked that monk,
Especially Columbo. ...

The monk was found while poor Chris slept;
They hazed him till he died-o.
The first mate wept, the second cursed,
The third mate up and cried-o.

Columbus took his drunken crew "and bound them to the mast-o" to give them "six and thirty lashes-o."