He met with the Royal Society where he demonstrated a calculating machine that he had designed and had been building since 1670 .
There Leibniz came into acquaintance of Henry Oldenburg and John Collins .
Leibniz met with the Royal Society where Leibniz demonstrated a calculating machine that Leibniz had designed and had been building since 1670 .
There Leibniz came into acquaintance of Henry Oldenburg and John Collins .