You yongsters Redwood ... this was how we LIVED !!
The handle was for the mangle on the top of the machine ... so after the paddle (we had one with the paddle on the side of the drum but later ones had a central paddle) had done it's business bashing your washing around for half and hour or so you hooked the washing out with a pair of wooden laundry tonges and pushed the corner into the mangle whilst your 5 year old son (me !) turned the handle and pressed the water out of the washed clothes ... before they got pegged out on the washing line. Tuimble driers (and even spin driers) came along much later !!
Oh ... and so did the water heaters inside the washing machine.... our water heater was a very large kettle on top of the range which was poured into the washing machine.
My grandmother DID have a hand powered washing machine ... fortunately, she had a housemaid who actually did the washing !!