Pop Pop the Hubble Bubble Tug is a self-propelled, steam-driven toy boat. Made of metal covered in blue enamel. Included is the original box, original instructions, and an article about how the toy works from New Scientist Magazine.
Pop Pop the Hubble Bubble Tug / a self-propelled, steam-driven boat. / Pop Pop the Hubble Bubble Tug / Manufactured by: Dive & Boats, / P.O. Box 12, / Waiheke Island, / New Zealand. / Pop Pop the Hubble Bubble Tug / The longer lasting toy. / Suitable for children between the ages of 10 and 60 (70). / Tin plated Steel, covered with Baked enamel ensures that rusting will not occur. / Runs on a small piece of candle, or a simple meths burner, or solid fuel tablets. / Full instructions enclosed. Printed
Pop pop the Hubble Bubble Tug / Instructions: The Pop Pop Tug runs on the simple scientific / principle of the Thermo Syphon. To operate, the Boiler Tube must be filled with water — this is most / easily done by blowing water through one tube / outlet — and allowing the water to flow out the / other. Once primed, the source of heat is placed / under the Boiler Coil and lit. Thus Tug will start to / move after a warm up period of between 30—60 sec. / No fuel included. Printed
Dive and Boats. Toy Tug Boat [Pop Pop], 2011.361. The Museum of Transport and Technology (MOTAT).