A single steam drum is mounted at the top between them, with smaller water drums at the base of each bank.

One bank of the generator tubes was separated in two, with individual lower water drums for them.

Sinak set off toward Khulr and the water drums.

Getting her bearings, she saw where the water drums still sat near the entrance to the small connecting tunnel.

Five of the six water drums were still intact as she had first seen.

The earth to make an earth bow, the river to make water drums.

The upper drum was shared, but the lower water drums were separate.

There, to their surprise, they found provisions that civil defense types had stockpiled some 50 years ago, items like medical supplies, water drums and drugs.

The forward "boiler" region was narrow-set, with its water drums placed between the frames.

In later years it was a problem for the non-circular water drums of Yarrow boilers.