That old master of all trades, Leonardo da Vinci, had so many ideas he could never get around to putting them all into practice. His notebooks are filled with detailed drawings of unfinished projects that have always fascinated his latter-day admirers. In its Manhattan headquarters last week, the International Business Machines Corp. put on display a traveling exhibit of 66 models of Leonardo's inventions, built to the master's own specifications by an Italian engineer named Roberto A. Guatelli, who helped build an earlier exhibit in 1939 (TIME, May 29, 1939).
Most of the models work, and all look much too modern to...
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