The vacuum cleaner connected to the exhaust

An invention from the past that suggests a project for the future, the car vacuum cleaner connected directly to the exhaust is a dream, but its use raises several questions: where do the vacuumed things go, what happens to the exhaust gases? A utopia that has existed since 1932 and was even proposed on the most popular model of the time, the VW Beetle.

Its use is simple: an aluminum bracket is attached to the exhaust pipe and the engine is left idling. As the exhaust gas passes through this device, suction is created at the inlet. Collected by a nozzle, dust and dirt are sucked through the pipe and expelled into the air at the rear of the car. It is manufactured in three models, for cars of different sizes.

Exhaust gases are not pumped through this pipe and deep into the seats, but rather the exhaust is passed through the device to create suction, via the Bernoulli principle. So, what we have here is actually a vacuum cleaner, albeit an incredibly noisy, expensive, and inefficient one. Which explains why this system was so popular.