pneumatic tube an inner tube, as in a pneumatic tire.
palimpsest a parchment, tablet, etc. that has been written upon or inscribed two or three times, the previous text or texts having been imperfectly erased and remaining, therefore, still partly visible.
Charlemagne A.D. 742-814; king of the Franks (768-814): emperor of the Holy Roman Empire (800-814), also called Charles I or Charles the Great.
Julius Caesar 00?-44 B.C.; Roman general and statesman; dictator (49-44) of the Roman Empire.
