I was always under the false impression that rotary washing lines were supposed to spin like windmills in the wind.
In fact, the rotation is provided only to allow loading and unloading the line without having to walk about too much whilst carrying a basket of wet washing.
Today’s invention is a version of this device which is free to rotate, when hanging or removing items. The turning part has a weather vane attached (yellow), which orientates it towards the wind, once the washing is aboard.
This vane gradually changes rotational position relative to the turning washing line, under the action of a clockwork motor (blue).
In this way, each face of the triangle lies on the windward side for approximately equal time intervals.