This electrical communication device sent coded messages over wires, famously using Morse code.

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TechnologyOne small aha

Your new ahaThe Telegraph

Telegraphy sends messages across distance using coded signals. Source: Telegraphy ↗

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07Volta's pile was an early example of this device that supplies electric current through chemical reactions.IDENTIFY
The Battery
Alessandro Volta's voltaic pile provided the first reliable continuous electric current.
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08George de Mestral developed this branded hook-and-loop fastener after studying burrs caught in fur.RECALL
Velcro
George de Mestral invented Velcro after studying burrs that had stuck to his dog's fur on a walk.
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09Jacob Perkins patented an early vapour-compression system for this food-cooling appliance.IDENTIFY
The Refrigerator
Jacob Perkins patented an early vapor-compression refrigeration system that made safe food storage possible.
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