INTENDED FOR THE INSTRUCTION AND ENTERTAINMENT OF YOUNG PEOPLE : IN WHICH THE FIRST PRINCIPLES OF Natural and Experimental Philosophp ARE FULLY EXPLAINED VOL. I. OF MECHANICS. "Conversation, with the habit of explaining the meaning of words BY THE REV. J. JOYCE. NEW EDITION CORRECTED AND IMPROVED. PHILADELPHIA: PUBLISHED BY M. CAREY, 121, CHESNUT STREET, |