"[...]up some old records putting it back to Hoang-ti 2679 B.C., but it appears to have been certainly in use in China in 1100 B.C., so we will be satisfied with that date. In presenting a subject to the young student it is sometimes advisable to use round numbers to give a simple comprehension and then leave him to find the overlapping of dates and methods as he advances. Keeping this in mind, the following table may be used to give an elementary hint of the three great steps in time measuring: Shadow time, 2000 to 1000 B. ...
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"[...]up some old records putting it back to Hoang-ti 2679 B.C., but it appears to have been certainly in use in China in 1100 B.C., so we will be satisfied with that date. In presenting a subject to the young student it is sometimes advisable to use round numbers to give a simple comprehension and then leave him to find the overlapping of dates and methods as he advances. Keeping this in mind, the following table may be used to give an elementary hint of the three great steps in time measuring: Shadow time, 2000 to 1000 B. C. Dials and Water Clocks, 1000 B. C. to 1000 A. D. Clocks and watches, 1000 to 2000 A. D. I have pushed the gear wheel clocks and watches forward to 2000 A.D., as[...]."
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