Rub-a-dub Tub

Bathtubs when first introduced in 1840 and laws were passed against their use due to safety reasons. Someone conceived the idea of a bathtub on wheels which visited homes by appointment. The idea worked so well these wheeled tubs were introduced in most of our larger cities and were quite a moneymaker. Most of them were built of steel and copper and about 7 feet long and nearly as wide. At least curtains on a frame gave some privacy.
(Capper’s Weekly, 1930)