On Sunday, 20 February, Tom, Mary Kay, Susie and Steve went to a special exhibition at the Palazzo della Cancellaria (Palace of the Papal Chancellery). The palace itself, dating from 1485-1513, is still a working papal "exclave" in the city of Rome. It was built for the nephew of Pope Sixtus IV out of travertine stone taken from the ancient Theater of Pompey. Rumor has it that the construction funds came from a single night's gambling.A team of historians, scientists, and engineers have built models of 45 devices that Leonardo da Vinci (1452-1519) designed and described in his notebooks. Many of the models are interactive so that you can play with them and see how the ingenious arrangements of wings, cams, screws, pulleys, belts, weights, levers, floats, ball bearings, flywheels, rollers, and springs operate a wide range of scientific instruments, military weapons, and industrial devices.
https://picasaweb.google.com/SteveDC505/LeonardoDaVinci#
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