J’ai trouvé une énorme boule en acier d’environ 150 livres (env. 68 kg) dans un ruisseau près de chez moi. Elle présente de minuscules trous de forage et a laissé s’écouler un liquide noir quand nous l’avons fait rouler. Une idée de ce que ça peut être ?

received recognition.

Grinding balls were among them.

They were replaceable tools in a much larger system, yet without countless pieces of industrial equipment like these, many raw materials could not have been processed at the scale required by expanding industries.

In that sense, the humble steel ball represents the hidden machinery behind modern development.

A Reminder of How Quickly Technology Changes

Industrial technology is constantly evolving.

Machinery that once represented the latest engineering solutions can eventually become inefficient, expensive, or obsolete. New designs, materials, automation, and processing techniques replace older