Manuscripts/Mixed Material Journal by Alexander Graham Bell, from June 7, 1902 to December 11, 1902
The second story is formed of three frames standing on the summits of the pyramidal frames constituting the first floor; the third story consists of one frame standing on the second story, thus completing the compound structure which is itself the skeleton of a regular tetrahedron like its constituents.
The second photograph shows the elemental frames piled away for storage.
The two photographs on the next page show 4 frames combined and screwed together, so that the resulting structure can be lifted without the elements falling apart. The young lady