When she’s been especially naughty, he sends her to the basement to do her corner time. It’s lonely, it’s out of the way, and a full cycle of the dryer makes a convenient timer, complete with a loud buzzer at the end:
"...the girls are prepared in the reformatory’s punishment room, naked, lying on their backs on special benches, bound with their legs spread above their heads, shamefully showing the two holes usually hidden..."