Which preposition to use with caldrons

of Occurrences 24%

Immediately after, the lictors seized him, and threw him into a caldron of boiling water.

with Occurrences 5%

In the center of a large room are rows of immense caldrons with coils of steam pipe embracing them.

in Occurrences 4%

Though indestructible, they may be banished for a time by the perverted Will, and mockeries of the brain, like the fume-born phantoms from the witches' caldron in Macbeth, take their places, and assume their functions.

Which preposition to use with  caldrons