National Museum of American History
Geometric Model by A. Harry Wheeler, Measurment of a Spherical Angle
Wheeler, Albert Harry
This cut paper tan model consists of two pieces showing circular discs with a projecting tangent plane at the top, as well as a paper ring of the same diameter. The ring fits in the intersecting discs to show how one measures a spherical angle. Two stickers read: MSA*. Another mark reads: Pat 1,192,483.
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