In photos of those old clotheslines, I remember seeing double lines with pulleys on each end.
Wonder if anyone ever took an other's laundry?
The idea is that one of your pulleys attaches on your back porch, balcony, etc.; the other runs to some distant anchor point. You bring the clothesline tight enough not to sag much, putting your knot on the top line. You pin an item of laundry on the lower line, push it out to make room for the next piece, pin that one on; repeat until the first piece of laundry is almost touching the other pulley. Let it dry, then remove the piece closest to you, pull the lower line toward you, remove the second piece, and repeat again.
My grandmother (Dad's mother) had one of these attached at her back porch, five steps from the washing machine. Very efficient, and it allowed you to use airspace not otherwise in use, high enough that it didn't interfere with traffic (in the yard or street).
It's about time for a revival of this design of clothesline.