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Perspective drawing with observer on swivel swing behind mirror. Pencil on paper, 8 x 12 inches, mounted on board, 9 x 13 inches. Signed R.W.P. and dated 1934. Palomar. Porter Papers.
- California Digital Library
- Contributing Institution
- California Institute of Technology
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- Chicago citation style
- Cassegrain focus. 1934. Retrieved from the Digital Public Library of America, http://archives-dc.library.caltech.edu/islandora/object/ct1%3A3644. (Accessed December 11, 2018.)
- APA citation style
- (1934) Cassegrain focus. Retrieved from the Digital Public Library of America, http://archives-dc.library.caltech.edu/islandora/object/ct1%3A3644
- MLA citation style
- Retrieved from the Digital Public Library of America <http://archives-dc.library.caltech.edu/islandora/object/ct1%3A3644>.