Piercy, Willis Duff · New York, Charles E. Merrill company · leaf 185
time-measuringdevices was a stick or pole i)lantcd ui)right in a sunnyplace. The position of the shadow which it cast marked 182 CLOCKS 183 time. The sun-dial was a devcloj)mciit of tliis simpledevice. It consisted essentially of two i)arts: a flatplate of metal marked off much like the dial of a… … A Sun Dial throughout the year, the upright piece was madeparallel to the axis of the earth. As the earth rotatedon its axis, the shadow cast by the upright piece movedfrom point to point on the dial, measuring the flight oftime. The sun-dial was in use among the earliest na-tions. Herodotus is…
Inventions
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