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Measuring Instruments from the 15th to the 19th Century
出版Praeger Publishers, 1971
URLhttp://books.google.com.hk/books?id=Co4SAQAAMAAJ&hl=&source=gbs_api
註釋Clocks are time-keepers, that is they are mechanisms which mark the length of time passed from the moment when they were set in motion. This length of time is composed of simple elements. -- Introduction.