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A Very Ancient Method to Shatter Carbonate Rocks

by Iulia Millesima

In his dreadful crossing of the Alps, Hannibal Barkas removed a gigantic rock by breaking it with an ancient method: the same often used by alchemists.

hannibal barkas crossing the alps jenny dolfenBy the ancient Romans, “to shatter a rock” was not intended as simple as holding a hammer and starting to apply a brute force upon it, nor even with the help of a more sophisticated scalpel. They did know the rudiments of introductory chemistry and applied them. A system not foreign to ancient alchemists to get their Alkahest, for how incredibly simple it may seem.

A piece of rock is alchemically useless if it remains in its bulky state. The matter must be turned into element water, or in a flowing state, that is either melted or powdered as finely as possible. One cannot start the work from the element earth and stay there. According to the theory of elements rotation, we must start from the element earth to return to the more glorious and indestructible earth through the other elements.

The most known European episode about the shattering rocks “technology” was the remotion of a vast and heavy monolith to allow the Carthaginian army elephants to overcome the obstacle and continue the journey along the narrow alpine paths among frightful ravines. That day the military engineers cleared the road by chipping away the rock with the only known system.

Hannibal decided to cross the Alps in 218 b. C. during the winter season, something unheard of at the time. Polybius and Livius were among the most important historical tracks to have the record. Pliny described several steps to enhance the scientific part of the challenge, or naturalistic, as they said at the time. In the sixteenth century Josephus Scaligerus, at that time Professor at Leyden University, compared the original manuscripts of Livius with the often full of errors and oversights transcripts of medieval scribes. Therefore, the report arrived to us is neither legendary nor hagiographic but rather faithful to the actual events.

From the Venetian writer Gianni Granzotto’s “Annibale” 1980, a real exhaustive biography of Hannibal Barkas: “… Hannibal ordered to shovel snow and clear the landslide with picks and shovels. He had brought a department of experts in all those works of embankment and adjustment needed in long journeys accidents.

But the main difficulty was a huge rock slipped with the landslide and remained there, planted among the debris, which blocked the passage between the mountain and the precipice. The boulder was covered with armfuls of resinous wood, pine, and fir branches were torn trunks with axes. When the pile was amassed high as a pyre all around the giant boulder, the fire was lit and crackled, illuminating the night’s darkness and the white snow. Inside the fire, the flames wrapped the rock up all over, and after a while, it became hot. At that point, the square of sappers overturned barrels of vinegar into the bonfire. The whole landslide crackled in outbursts; it seemed like a volcano’s eruption. The vinegar acted on the hot stone with the effect of dynamite. Polybius and Livius claimed that the rock was split into fragments and quickly removed at the end of that hell. A few hours after, the road was open.

This reminded me of a trip I made in China when I was taken to see the Tungkjang dam in Szechuan. Built in 256 b.C, almost at the same time as Hannibal’s march in Europe. Let me explain why the two events were associated in my mind: the builder of the dam, the imperial governor Li-bin, still revered as a deity, diverted the waters of the river out of their bed and launched them to the catchment for irrigation, faced with the need to break down a rock wall twenty meters high. In the year 256 b.C., there were, even in China, neither explosive nor mechanical levers; the Chinese officers’ dam, through an interpreter, told me that the incomparable Li-bin used the method called “of fire and frost”. He had the rock heated till hot, and then he had it poured over waterfalls of vinegar. Repeating the process several times, the rock gradually shattered. The same as Hannibal’s engineers … “

A large percentage of the world’s mountains, seas, and deserts rocks are carbonate compounds. Ancient chemists didn’t use normal culinary vinegar but rectified or distilled it repeatedly.

Some Renaissance chemists then started to add common salt to vinegar. To end, the reference to the night hours by Pliny and Scaligerus was not only for poetic effect (especially knowing Pliny).

Filed Under: Alchemy & Science History Tagged With: Carbonates, Vinegar

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