An American mathematical dissecting sphere for use as a demonstration model. The wood demonstration model is by Albert H. Kennedy (1848-1940) of Rockport, Indiana. This form was developed by Kennedy as physical models to show basic mathematical principles, in the case of this sphere demonstrating that spheres consisted of a smaller series of pyramids.
The late 19th century saw a large number American and European mathematical models developed as teachers sought graphic means to teach. The development of these models paralled the teaching of math, the rise in student numbers and mandatory education - though few models survive to this day.
Before this period only the children of the privileged were assured an education and many didn’t receive early education until figures such as the German Friedrich Froebel (1782-1852) invented kindergarten.
United States of America, Circa 1920
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3 800 €