Piercy, Willis Duff · New York, Charles E. Merrill company · leaf 187
th century, though theinventor is not known, nor the exacttime or place of invention. AVhen portable clockswere invented, the motive power must have beenchanged from weights to main-springs, and thischange in motive force marks an era in the devel-opment of the clock. The introduction of the… … A GrandfathersClock, belongingTO William Penn 186 INVENTIONS AND DISCOVERIES lum, the first to bring it into practical use, about 1G57.Credit for inventing the pendulum is also claimed forHarris, a London clockmaker; for Hooke, the greatEnglish philosopher; for a son of Galileo, the…
Inventions
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