Manual of cardboard construction for third and fourth grades (1902)
Kunou, C. A. (Charles A.), Board of Education of the City of Los Angeles · [Los Angeles] · leaf 67
each side of outside square and draw oblique lines to angles of inside square as shown in drawing. Draw triangles A, B, C, D, f " altitude. Note points of connection. Cut out figure following the full outline. Score on dashed lines in the corners and on the lines of inner square. Fold sides upward… … .64
Paper work
Internet Archive · University of California Libraries · Public domain (published before 1931). Free to use for anything.
