The marble was but roughly hewn, in lines that held the suggestion of an hourglass.
There is a good oak pulpit, with hourglass holder, and some heavy 15th-cent.
To calculate it one must reckon a century for every turn of the hourglass.
At the sound the bearded old man raises his sceptre, opens his mouth, and turns an hourglass.
I think an hourglass running out would help ...