Browse Items (15 total)

Physical Description: The Pickett 1000 slide rule is made of three rectangular bars of aluminum alloy coated in plastic with grooved slides.  Two bars are connected at the end with braces that are mounted to the flat side of the bars and the third…

A white plastic protractor connected to a right angle square, allowing for dimension and angle drawing. The window below the protractor is has slightly non-parallel long edges that diverge at about 2-3˚. Design patent no. 93,979—meaning it was…

Planimeters in general are used to calculate the area enclosed inside an arbitrary shape on a plane. Polar planimeter's, 103 types, perform a mechanical integration as a stylus is traced around the perimeter of the shape in question. Because the…