Abstract<title> RIASSUNTO </title>Amici applicò il principio della duplicazione dell'immagine ad alcuni strumenti astronomici. Tra le numerose invenzioni, in particolare egli costruì un nuovo micrometro basato sul principio della duplicazione dell'immagine fornita da un telescopio.Egli conosceva l'invenzione del micrometro obiettivo di Dollond, del micrometro prismatico di Rochon e del micrometro oculare di Ramsden, ma il suo presentava alcune differenze che egli definì in numerose pubblicazioni.Il micrometro di Amici può venire applicato ad un telescopio a rifrazione con una lunghezza focale molto grande, e veniva utilizzato per misurare la distanza tra stelle doppie. Perciò il vetro, che proveniva dalle manifatture di Fraunhofer, doveva essere di ottima qualità.Sarebbe interessante ricollocare il micrometro di Amici tra quelli simili del suo periodo. In questo modo potremmo precisare le cause e le consequenze dello spirito con cui la ricerca attiva per perfezionare gli strumenti costituiva una emulazione intellettuale e favoriva lo sviluppo di un positivismo relativo.

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In April 1919, delegates of five allied nations gathered in Paris, at the initiative of the Société de Chimie Industrielle (SCI-F) and the French Federation of Chemical Associations (FNAC) to decide on the creation of an interallied confederation for pure and applied chemistry. The delegates were following up on a proposal made by the Interallied Conference of Scientific Academies that had met in London and Paris in 1918. Each country was asked to create a national body in each discipline, and these entities would be united into a Union, at first an interallied then international union when the wounds of war healed. The whole structure was to be headed by an International Research Council (IRC) [1].

Founded in 1919, the International Union of Pure and Applied Chemistry (IUPAC) was successor to the International Association of Chemical Societies (IACS), which had been founded eight years earlier at the initiative of Albin Haller. The statutes of the IUPAC (like those of the IACS) were written in French, and it was agreed that the IUPAC's administrative headquarters should be in Paris. With these arrangements in place, the role of French chemists generally, and of Haller and Charles Moureu in particular, assumed crucial importance. In 1927, on the occasion of the centenary of Marcelin Berthelot's birth, plans were laid for an international centre for chemistry in Paris, soon to be known as the Maison de la Chimie. From the start, the Maison de la Chimie project was led by the French, most conspicuously by Jean Gérard, general secretary of the Société de chimie industrielle and of the IUPAC. Gérard's contribution to a number of national and international committees, notably for scientific documentation, left an enduring legacy. The years between 1918 and 1927, especially 1918-1919, were decisive for the rebuilding, on many fronts, of international networks embracing individuals and institutions recently separated by war. This article examines the particular case of chemistry, with reference to this wider context and to the widely shared determination to fashion an organisation that would transcend national boundaries and embrace both the pure and the applied aspects of the discipline.