Concept of drying laundry by suspension from various devices hung on ceilings goes back ages.
In large estates or laundries all over Europe systems of large poles were suspended from stationary racks hung on ceilings.
Sheila Maid, Clothesmaid and other brand names are just various versions of the Victorian, Edwardian or Lancaster racks and pulley systems that came out around middle to late 1800's.
https://www.clothesmaid.com/
https://artofidentification.com/furniture/rack/pulley-clothes-rack
These pulley clothes racks grew in popularity along with the rise of the middle class of Victorian GB. All those new terraced houses and so forth built for the middle class had to have some way for laundry to get done. So besides the copper you had these ceiling clothes racks.
Besides taking advantage of fact hot air rises (so air at ceiling was warmer than lower down), these suspended contraptions allowed wash to be dried indoors when weather didn't permit it being done outside. Thus giving Her Indoors a bit more control over her wash days. Hanging the wash up and out of the way got rid of the various drying racks/clothes horses that would be scattered around a house or in front of a fire/AGA type range.
In great estates or laundries a small coal or whatever fueled stove would provide heat in a room that through convection air currents helped dry things. It also dealt with the dampness that not only came with climate, but from drying things indoors to some extent.
In the new middle class homes the various AGA type ranges (which were always fired up) provided heat, which is why the pulley racks were always located in kitchens. This provided several downsides.
One, thanks to poor extraction of wringers/mangles it often meant dealing with wash dripping from ceiling onto things and those below until it dried sufficiently.
Two, often whatever was drying was scented by whatever was being cooked in kitchen. If it was kippers then you had fish scented washing. *LOL*
Between heat and damp from the coppers, wet laundry drying indoors, then steam from ironing as you can imagine many homes back then were not very pleasant on the several days it took to get washing done. All this piled onto naturally damp climate conditions.