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http://s3.amazonaws.com/omeka-net/2253/archive/files/a28ba9949285c76f50d85866673836cb.JPG
This model shows a geometric surface called a hyperboloid of one sheet. It was used in mathematics and architecture classes. The wires are straight lines. For any point on the surface, there are two straight lines lying entirely on the surface which…

http://s3.amazonaws.com/omeka-net/2253/archive/files/55aa01966a9826f0904c15714a50a179.JPG
A mathematical instrument for laying down and measuring angles on paper, used in drawing or plotting.
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