Not sure when exactly the spin extraction meets with laundry and how exactly the idea (if we can speak of idea) happened, if someone ever patented the first laundry spinner, or washing machine with spinner incorporated, but I guess the thing of spin in laundry dates back to around the 20s also, and anyway I suppose following the electric motor, am not sure if sorts of spinners were present in laundries having steam engines....
Anyway, the thing of spinning as said applies historically to 2 main operations, separation and extraction, many of which known since the ancient days, cream separation perhaps is the first example for which centrifuge action was used to separate, and perhaps the first uses of centrifuge in extraction was for honey.....
Let's say, that what could not be extracted with pressing, like salad, then had to be spinned.....so for certain things you could not do otherwise even before.
But:
After the advent of electricity in households and later motorization and advent of electric appliances, like OTOH had been in in industrial revolution (in industrial circumstances) so after the steam engine discovery, we had seen how furtherly how many extraction operations that before were made by pressing, then switched to spinning, this is because spinning avoided all the pressing work that otherwise had to be done piece by piece, or that even though not requiring more time and efforts with pressing, and so possible to do all in one operation, then required lot of work to clean up the extracted product from byproducts of the pressing extraction method, not to mention that they allowed to spin in bulk quantities of heavy stuff that otherwise you could not reach with human force, so spinning extraction as for separation in many cases became possible and appliable to certain uses only thanks to the motors, so again, that made possible either to reach high speeds or power/forces that otherwise you could not reach manually or with horse power, whatever, and so giving results you could only get with pressing, but wthouth giving a lot of accessory work ahead because of it.
In laundry:
Of course to emulate the action of a spinner you need a motor, I mean, I am not aware of laundry spinners you could activate with hand power, perhaps pedal, but likely not fast enough to be comparable to a wringer result, and that anyway would be a huge separate unit to have, let alone to include to a manual washing machine, not much worth it, an average person can not anyway manually spin all at once a whole tub of clothes though and get a decent result as of today, at least i am not aware of stuff/objects in the past and present able to do that...
In the case of laundry, I think the electric motor played a main role for it's application in this field, like the others extraction fields, it allowed to avoid to squeeze in the mangle/wringer piece by piece, and allowed more extraction power....
Many machines then still came with the wringer... "wringer washers", we got twin tubs along with separate spinners, and finally spinning automatics.
But cannot tell if the appliacation of spin in laundry machines, came from seeing something like a salad spinner of a french chef, it would seem a kind of urban legend.... I personally find it bizzarre.... why french then? Was it just the fench?
Ok that first patented salad spinner is french...but...it seems unlikely this story.
I mean, the idea of a salad spinner did born thanks to the common technique,to wash salad and collect it in a wire basket and twist it....later did born basket with lateral upper guards on purpose, and later ones with a center hole on purpose to put the sink on an heavy base, even later one with a pump-like mechanism, and later the single hand cranked unit , which was the salad spinner as we know today, french patented salad spinner from a certain Jean something, founder of moulinex company, famous for hand cranked kitchen stuff, vegetable mills hand cranked "mouli legumes", grinders and such, moulin OTOH means mill in french...
Other things than the wire basket, did born much after the earlier documented laundry spinners or spinning washers we can find...so.....not sure how much truth relies in the french chefs or salad spinner tales....
Anyway.....
I am prone to think that it was just thanks to the electric motor, and so in laundry like for the rest,it made possible to go with spin for extractions that otherwise were done by pressing, achieving job faster and saving further work.
[this post was last edited: 8/30/2014-19:22]