Thomas Telford, Scottish Civil Engineer  
Thomas Telford was a Scottish civil engineer, architect and stonemason, and a noted road, bridge and canal builder. Apprenticeship as a stonemason laid the basis for Telford's move via Edinburgh to London, where he worked on Somerset House...
    Amedeo Avogadro, Italian Chemist  
In 1811 Amedeo Avogadro hypothesized that equal volumes of gases at the same temperature and pressure contain equal numbers of molecules. From this hypothesis it followed that relative molecular weights of any two gases are the same as the...
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