From before gadgets were invented

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The flying ferry in the german city of Rendsburg across the Kiel Canal
which is the very trafficked waterway from the North Sea to the Baltic Sea.

The ferry floats over in the short breaks between the many passing ships.

Known as the Rendsburg High Bridge – with railway track on the top
and a transporter bridge underneath but still above water.
A design by Friedrich Voss a german civil engineer and built 1887-95.

The train running are independent of the large vessel traffic.

A kind of gadget from before they were famous and very useful on top of that.

Daily prompt “Pick a gadget

Are there any rules on how large gadgets can be ..?

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