Parry Moon. Parry Hiram Moon (; February 14, 1898 – March 4, 1988) was an American electrical engineer who, with Domina Eberle Spencer, co-wrote eight scientific books and over 200 papers on subjects including electromagnetic field theory, color harmony, nutrition, aesthetic measure and advanced mathematics. He also developed a theory of holors.

Biography
Moon was born in Beaver Dam, Wisconsin, to Ossian C. and Eleanor F. (Parry) Moon. He received a BSEE from University of Wisconsin in 1922 and an MSEE from MIT in 1924. Unfulfilled with his work in transformer design at Westinghouse, Moon obtained a position as research assistant at MIT under Vannevar Bush. He was hospitalized for six months after sustaining injuries from experimental work in the laboratory. He later continued his teaching and research as an associate professor in MIT's Electrical Engineering Department. He married Harriet Tiffany, with whom he had a son. In 1961, after the death of his first wife, he married his co-author, collaborator and former student, Domina Eberle Spencer, a professor of mathematics. They had one son. Moon retired from full-time teaching in the 1960s, but continued his research until his death in 1988.

Scientific contributions
Moon’s early career focused in optics applications for engineers. Collaborating with Spencer, he began researching electromagnetism and Amperian forces. The quantity of papers that followed culminated in Foundations of Electrodynamics, unique for its physical insights, and two field theory books, which became standard references for many years. Much later, Moon and Spencer unified the approach to collections of data (vectors, tensors, etc.), with a concept they coined "holors". Through their work, they became disillusioned with Albert Einstein's theory of relativity and sought neo-classical explanations for various phenomena.

Holors

Moon and Spencer invented the term "holor" (; Greek ὅλος "whole") for a mathematical entity that is made up of one or more "independent quantities", or "merates" (; Greek μέρος "part") as they are called in the theory of holors. In modern parlance, holors are precisely multidimensional arrays of real numbers, and the terminology of holors is very rarely encountered. See the appendix of  for a concise description of holors.

Bibliography

Books
 Parry Moon, The Scientific Basis of Illuminating Engineering, McGraw-Hill, 608pp. (1936) (ASIN B000J2QFAI).
 Parry Moon, Lighting Design, Addison-Wesley Press, 191pp. (1948) (ASIN B0007DZUFA).
 Parry Moon, A Proposed Musical Notation, (1952) (ASIN B0007JY81G).
 Parry Moon & Domina Eberle Spencer, Foundations of Electrodynamics, D. Van Nostrand Co., 314pp. (1960) (ASIN B000OET7UQ).
 Parry Moon & Domina Eberle Spencer, Field Theory for Engineers, D. Van Nostrand Co., 540pp. (1961) ().
 Parry Moon & Domina Eberle Spencer, Field Theory Handbook: Including Coordinate Systems, Differential Equations and Their Solutions, Spring Verlag, 236pp. (1961) ().
 Parry Moon & Domina Eberle Spencer, Vectors, D. Van Nostrand Co., 334pp. (1965) (ASIN B000OCMWTW).
 Parry Moon & Domina Eberle Spencer, Partial Differential Equations, D. C. Heath, 322pp. (1969) (ASIN B0006DXDVE).
 Parry Moon, The Abacus: Its History, Its Design, Its Possibilities in the Modern World, D. Gordon & Breach Science Pub., 179pp. (1971) ().
 Parry Moon & Domina Eberle Spencer, The Photic Field, MIT Press, 267pp. (1981) ().
 Parry Moon & Domina Eberle Spencer, Theory of Holors, Cambridge University Press, 392pp. (1986) ().

Papers

Notes

References

American electrical engineers
University of Wisconsin–Madison College of Engineering alumni
MIT School of Engineering alumni
MIT School of Engineering faculty
1898 births
1988 deaths
People from Beaver Dam, Wisconsin
20th-century American engineers