Mop No More

Lili McGrath’s admirably low-tech “floor polisher,” patented in 1915, is little more than a pair of slippers, but the description is charming:

The wearer merely places his or her feet within the slippers and begins to dance, preferably such dances as require long glides, and it will be seen that the floor polishing operation becomes a pleasure.

The cord “is made of a length permitting a full stride of the wearer, as in dancing, but not sufficiently long to admit of the wearer’s feet spreading apart to permit his or her fall.” We could market this today.