his clocks were not only of the very finest quality but were also housed in exceptionally beautiful cases; notably those made by jean-michel ziegler and andré-charles boulle. his works are now installed in some of the world’s finest collections including the musée du louvre, musée de cluny and musée national des techniques, paris; the musée des arts décoratifs, lyons; musée de saint-pierre; musée de pau and château de champs; the museum der zeitmessung beyer, zurich; musée d’horlogerie de la chaux-de-fonds; the mathematisch-physikalischer salon, dresden; the victoria and albert museum, london and the museum of art, cleveland, ohio.'