The Double Pneumatic Pump

The double pneumatic pump was invented by denis papin in the early 19th century. But it wasn't until a scottish engineer, william murdock, came up with the idea that others would run with it. Now let me ask you, is this the one where you get in a tube, and you press a button, and then you just fly a crow? Ama, shucks. I don't recommend yo,. well, ok, so they're downsides. You'd really need that air brake system to work really ndyour ears would pop like a mutter.