The hot-water cylinder is closed firmly at the top, and therefore, when the air is allowed to escape, the water rises to the top.
And you boys fill the ice-cap—and the hot-water bag and—hurry!
Are you still as obstinate as ever about that hot-water bottle?
If the photophore is unavailable, a hot-water bottle may be applied.
He hated to have that hot-water bottle dangling ...