Libros de systems and standards

Documents in reference to the general adoption of the twenty-four notation of the rail-ways of America

Vom Herrscher zur Dynastie

Papers on time-reckoning and the selection of a prime meridian to be common to all nations

[ Letter to the Astronomer Royal, Greenwich, June 21st, 1887]

L' adoption d'un maître méridien international

Greenwich time and the longitude

From Sundials to Atomic Clocks

The global transformation of time