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Lightbulbs in Stand
These light bulbs were manufactured around 1905. They can be dated by the construction of the filament. To learn more about antique light bulbs,…
String Model of a Hyperboloid
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…
Circular Protractor
A mathematical instrument for laying down and measuring angles on paper, used in drawing or plotting.