The firemen's songs continued in the 1840s, too.

THE BALTIMORE PHOENIX AND BUDGET, 1(11), Feb 1842, carried a story with this line in reference to a steamboat on the Ohio:

"The half-naked negro firemen busily casting huge sticks of wood into
the mouths of the row of yawning furnaces beneath the serried boilers,
accompanying their labor by a loud and not unmusical song;"