Tub Sub (Jul, 1947)
THE bathtub battle fleet has a colorful new recruit—a plastic “rocket” submarine that performs a series of gliding dives on- pill-power. The manufacturer, Payne Products, Inc., of Midland, Mich., supplies effervescent tablets designed to propel the craft for six or seven minutes. Agitating the water slightly makes the submarine dive oftener.
When the submarine is placed under water to start its voyage, the gas-releasing “fuel” acts as a pump, expelling water and sending the craft to the surface. Then it submerges again, and the cycle is repeated. Balance and glide as the toy rises and sinks provide its forward motion.