Geometry
Keystone View Co.
1892–1920
- Medium
- Gelatin silver print, stereo
- Dimensions
- Each image: 7.8 × 7.6 cm (3 1/8 × 3 in.); Card: 8.8 × 17.8 cm (3 1/2 × 7 1/16 in.)
- Genre
- Photography
- Museum
- Art Institute of Chicago
Tags
photographic techniques19th centuryphotographyalbumen processphotographic processesblack-and-white photographyalbumen silver printphotographstereograph (albumen)
About
Text printed on reverse of stereocard: No. 43 – (34224) Geometry Unit – The SphereA sphere can be circumscribed about any given tetrahedron.Corollary: Through four points not in the same plane one spherical surface, and only one, can be passed.Corollary: The four perpendiculars erected at the centers of the faces of the tetrahedron meet at a point.
