National Museum of American History
Geometric Model by A. Harry Wheeler, Spherical Angle and Its Measure
Wheeler, Albert Harry · 1916
The angle between two great circles on a sphere is defined to be equal to the angle between the lines tangent to the circles at their point of intersection. This cut and folded tan paper model of a sphere shows two intersecting great circles and tangents to them. It is among the models Wheeler dubbed collapsible.
🔒
Order museum-quality prints
Sign in to order prints, canvas, and more of this work. Browsing and full-resolution downloads stay free.