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Teddy Zhang

📍 Shanghai City

《Isochronism of Balance-Springs》(1862)

《Isochronism of Balance-Springs》(1862)

《How to Keep the Clock Right by Observations of the Fixed Stars》

《How to Find the Time at Sea in Less than A Minute》(1918)

《Horology》(1868)

《Horologium Oscillatorium》(1673)

《Horological Time》

《Horological Department》(1918)

《History of the American Waltham Watch Company of Waltham, Mass》

《History of the American Clock Business for the Past 60 Years》

《Histoire de la mesure du temps par les horloges Vol.1/2》(1802)