"J. R. Losada fabricó dos modelos de cronómetros marinos con una autonomía de marcha de 56 horas y otro de 8 días, llegando a servir 70 unidades a la marina militar española. A esta serie pertenece el cronómetro aquí expuesto" Datado entre 1850 y 1860. Museo Nacional de Ciencia y Tecnología (Estación de Delicias, Madrid) pieza 2001/26/1 del catálogo.
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