Then he reached up and slowly turned the silver knob.

Heavy, with rounded silver knob, it formed an interesting curio.

He twisted the silver knob; then pulled it.

He held up the ebony walking stick and examined the silver knob.

He wore a dark blue coat, and carried an ebony stick with a silver knob.

He was standing directly in front of one of those strange silver knobs in the wall.

There was a large silver knob on the end.

On the library side, it had a keyhole in the middle of a plain silver knob.

A knock on his door had the authority of a silver knob at the end of a rich man's cane.