Curiosities from 150 years of The Engineer archive

Following the Horse Tank described in our last issue, the Engineer's first-ever team of intrepid journalists turned their attentions to underwater travel, revealing to the world 'Deschamps and Vilcocq's free diving boat' - a hand-powered submarine.

The article described a vessel 'which may be freely directed backwards and forward at the surface or at the bottom of the sea by the operator by means of a screw helix and a rudder, both set in motion by means of gear wheels arranged inside so as to be worked by the hand of the operator'.

According to the article, the submarine operator would be able to breath freely and work underwater for several hours thanks to an onboard store of compressed air accessed by sucking on a plastic pipe. Other frills included a glass floor for close analysis of the sea bed and a built-in set of rubber gloves for the submariner to touch and palpate objects outside the submersible.

Employing the same principles of buoyancy seen in today's underwater vehicles, the submarine could be made to rise and fall by filling and emptying two sets of hosing attached to the outside of the vessel with compressed air. Batteries contained within a watertight chamber powered onboard lights as well as a search lamp to 'project light to a very great distance'.

According to The Engineer, the vesssel had a host of applications from making 'investigations and discoveries at the bottom of the sea' to raising or destroying foundered vessels and 'reconnoitring without any danger of being discovered'.

But while it's certainly an early example, this is not the first submarine. That honour, according to Aristotle, goes to Alexander the great, who developed a primitive underwater reconnaissance vehicle in 332 BC.

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