Volvelles and slide charts
Matthew Paris, a Benedictine monk of 1200, was the inventor. At the time the books were very heavy and to consult the circular tables, used to calculate religious holidays, he had to walk around them: Paris realized that it was more comfortable to turn the tables instead walk up and down!
They replace the manual exploration of the tables needed to identify the stars, to help in first aid, to calibrate mixtures of colors or to choose the wine for an elegant meal.
Petrus Apianus in 1500 created true works of art, with hand-painted engravings, but only with the introduction of the printing press the production of smaller and cheaper models became possible.
One of the first volvelle, inserted in a book, Petrus Apianus ca. 1540
Volvelles for agricultural and navvy use, ca. 1945
Parking disc and volvelle for the calculation of the DNA
Modern volvelle, inserted in a magazine, 2012
Slide chart for fuel calculation, 1958, and a
Modern slide chart with takeoff nomogram
Software with analog interface
Nicola Marras 2008
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