is divided into two subseries and contains graphs, unbound loose notes, notebooks, data books, and research papers. Material is arranged chronologically with the physical description (i.e. "graphs") and subject (if known) as folder headings. Series X is primarily of interest as a record of Smyth's early research in physics and for examples of courses he taught at Princeton University. The entire series contains only a small portion of Smyth's scientific notes taken as a student and given as a professor. Only materials relating to his studies and teaching at Princeton University have been preserved by Smyth; notes involving Smyth's research at Cambridge do not exist in this collection.

Scientific class notes taken by Smyth as an undergraduate student at Princeton are located in Subseries A (Box 1) and date from 1916 through 1919. Folders are entitled with references such as "Mechanics Problems" and "Senior Experimental Physics." Material dating from 1919 appears to relate to Smyth's independent research on nitrogen with Professor Karl Compton of the Princeton physics department after he received an A.B. in 1918 but before he entered his masters program.

Subseries B (Box 2) holds Smyth's notes prepared for physics courses he taught at Princeton from 1927 through 1935. These materials take the form of lecture and experiment notes and are often referred to by course title (i.e. "Physics 109"). Researchers should note that Subseries B only provides a small sampling of his teaching at Princeton; unfortunately, a greater portion of his preparatory course material was not preserved.

contains the typescript and manuscript letters, carbon copies, postcards, and telegrams generated between Smyth and his family members and friends throughout his lifetime. Materials are arranged alphabetically by correspondent's name and then chronologically within each file. A major portion of this personal correspondence dates during the 1920s, when Smyth was traveling and studying abroad as a young man. Another significant group of correspondence in this series is dated 1945; these letters are primarily congratulatory notes from friends and family to Smyth after his work with the Manhattan Project and the Smyth Report was revealed to the public.

The bulk of Smyth's personal correspondence involves his family members. A letter from Smyth as a child in 1902 to his grandfather, [?] Phelps, is the earliest piece of this series as well as the first manuscript in the Smyth Papers bearing his signature. Dictated to and typed by his paternal grandfather, Charles H. Smyth, this charming letter describes the ponies, canal boats, trains, and trollies seen by Smyth at age three; unable to sign his name at this young age, Smyth places an "X" besides his typed name.

The most noteworthy family letters in this series are written by Smyth to his parents while studying for a Ph.D. at Cambridge University (1921-1923) and as a Guggenheim Memorial Foundation Fellow in GC6ttingen (1931-1932). A postcard to his father dated 1922 displays the Cavendish Laboratory at Cambridge, where Smyth studied under Ernest Rutherford. These manuscripts contain extensive descriptive information regarding Smyth's research and travels in Europe. Researchers should note that these materials are filed as "Smyth, Charles H., Jr. and Ruth Anne (Phelps)" in eight chronologically arranged folders.

Other family correspondence of interest is filed under "Smyth, Charles P." These are letters of condolence received by Smyth's elder brother after his death in 1986. Mainly from colleagues and close friends, the letters are addressed to Smyth's brother Charles and are therefore filed with his correspondence. Friends who were also professional correspondents with Smyth have been cross referenced to their primary folders in Series I.

Personal correspondence involving Smyth's friends is primarily dated from the earlier part of the twentieth century. Correspondence between Smyth and close friends later in his career usually involves colleagues and associates; therefore, these manuscripts have been filed with the professional correspondence of Series I. Letters from friends he met during his travels abroad and across the United States as a young man remain with the personal correspondence of Series XI.

consists of correspondence (Subseries A, Boxes 1-4) and diaries (Subseries B, Boxes 5-8) maintained by Smyth's wife throughout their courtship and marriage. Letters from Henry Smyth to his wife have been filed in this series instead of with his personal correspondence of Series XI. This was done primarily because these manuscripts were stored with Mary Smyth's letters to her husband and appeared to have been preserved and arranged by her after their marriage. All other correspondence in the papers of Series XII consists of incoming letters received by Mary Smyth or copies of her outgoing letters. The earliest piece of this series is a letter from Smyth to Mary de Coningh dated 1928 in which he refers to their recent meeting in Europe.

Mary de Coningh Smyth was born in Chicago, Illinois to Lucy and Frederick de Coningh on New Year's Eve, 1904. She was raised with her two brothers, Peter C. and Edward Hurlburt de Coningh, in "one of the old houses" on the prosperous south side of Chicago (see Series II, General Subject Files under wedding announcement). After preparing at the Faulkner School for Smith College, she attended Smith in Massachusetts for four years and was graduated in 1926. Upon completion of her degree, Mary de Coningh spent several years traveling and studying abroad, including some work at the Sorbonne in Paris. During these early years in Europe, she started a career in journalism and worked on a newspaper in Geneva, Switzerland. It appears from her initial correspondence with Smyth that it was at this time they made their first acquaintance and began an approximately eight year-long friendship/courtship.

In 1932, Mary de Coningh returned to Illinois to accept a position with the Chicago Council on Foreign Relations to "promote public discussion of the foreign relations of the United States."

Kenneth T. Jackson. Chicago Council on Foreign Relations, a Record of Forty Years, (Chicago: Chicago Council on Foreign Relations, 1963)

After her marriage, Mary Smyth applied the skills which she had developed in her own profession to managing her husband's career as a prominent Princeton University physics professor and department head, statesman, and historian. She often acted as his personal secretary, editor, and writing associate. Besides providing intellectual support to Smyth's career, she appears to have been solely responsible for the maintenance, both physical and financial, of their homes in Princeton and Washington, D.C.

Subseries A holds four boxes of correspondence generated and collected by Mary Smyth for the near fifty years she was associated with Henry Smyth. Correspondence exists in the form of incoming and outgoing manuscript and typescript letters, carbon and handwritten copies, telegrams, and cards. It is organized alphabetically by correspondent's name and then chronologically within each file.

The most significant run of correspondence in this series consists of letters written between Henry and Mary Smyth. The bulk of this material dates between 1928 and 1936, documenting the years of their courtship. Much of this correspondence refers to Smyth's early research and teaching in the Princeton University physics department as well as Mary Smyth's work with the Chicago Council on Foreign Relations. Although correspondence between husband and wife after their marriage does exist, it is not nearly as regular and extensive. Obviously, their long distance relationship between Chicago and Princeton required much more written correspondence.

This personal correspondence between Mary Smyth and her husband has been filed within this series under "Smyth," with letters from Henry Smyth to Mary Smyth arranged first, and Mary Smyth to Henry Smyth second. This was done primarily because Smyth's letters to his fiancée and wife start at an earlier date. All correspondence between the two which has been preserved ends in 1976. It should also be noted by researchers that this personal correspondence is not always fully dated, carrying only notations such as "Monday evening." For this reason, readers should take extreme care to maintain the original order of the letters as they appear in each folder. These manuscripts were left in the same order they were found and labeled; as their text appears to follow a general chronological order, no attempt has been made to reorder these files.

Other correspondents of Subseries A mainly include family members and friends, although there is also a small amount of material relating to Mary Smyth's duties as personal secretary to her husband. Many personal, family-related matters are discussed in letters to and from her brother Edward ("Edro") de Coningh. Mary Smyth's involvements in local Princeton politics and culture are reflected in her correspondence as well; several folders containing material relating to her work as secretary to the New Jersey Adlai Stevenson for President Committee (1956) and her patronage of the McCarter Theatre for the Performing Arts of Princeton University (1961-1973) document such activities. Occasional correspondence between Mary Smyth and her husband's colleagues and their wives provides a limited view of the Smyths' social life. Descriptive entries in her diaries offer a much more detailed look at their socializing in Princeton and Washington, D.C.

The diaries of Subseries B offer extensive personal and historical information relating to the Smyth marriage and Henry Smyth's career. Field in four boxes, these bound volumes are arranged chronologically by year. Starting in 1935 and ending in 1970, Mary Smyth chronicles her marriage in three entries per day; morning, afternoon, and evening notes record her chores, pastimes, emotions, illnesses, appointments, travels, and social events. Entries often provide detailed information regarding her husband's scientific work and government involvements; as such, they offer some of the most accurate and insightful documentation of Henry Smyth's career found in the Smyth Papers. Both Smyth and his wife recognized the historical significance of these volumes, as they both often used them to verify dates of important meetings, letters written and received, drafts of speeches and manuscripts prepared for publication, telephone calls, etc.

Mary Smyth's dedicated support of her husband's career is fully illustrated throughout her diaries. As mentioned earlier, she often worked as his personal secretary at home, writing and typing letters and manuscripts. Many materials throughout the Smyth Papers bear her handwriting and edits; Mrs. Smyth's diary entries record the amount of time spent on this work and provide much insight into Henry Smyth's thoughts and concerns when collaborating with his wife. Probably the most significant instance of this occurs in the 1954 diary, in which Mrs. Smyth documents her day by day involvement with Henry Smyth and his U.S. AEC assistants, Clark Vogel and Philip Farley, on the Oppenheimer dissenting opinion. Comments on their progress as entered in the diary are further illustrated by manuscript drafts of the "Dissenting opinion of Henry DeWolf Smyth in the matter of J. Robert Oppenheimer [in U.S. AEC "Statement by the AEC"]" filed in Series VIII with manuscripts of published works.

The diaries of Subseries B also illustrate Mary Smyth's management of their homes in Princeton, New Jersey and Washington, D.C. Many entries refer to her handling of household related finances and supervision of employees. Mrs. Smyth was also responsible for planning all social events held in their homes. Diaries hold much detailed information regarding their cocktail parties and dinners, including lists of invited guests (noting those who actually attended), menus, and her personal comments on the following day. These social gatherings were often for pleasure, including close friends and colleagues of Henry Smyth. It does appear that some events were organized primarily for U.S. AEC, IAEA, or Princeton University physics department associates.

is composed of Smyth's newspaper and magazine clippings, some of which are arranged in scrapbooks, and a few complete newspapers. The bulk of the material covers activities from 1945 to 1954. During this period Smyth collected in many areas, most notably the social and political impact of the atomic bomb, the J. Robert Oppenheimer security clearance case, and the nomination of Lewis L. Strauss for Secretary of Commerce. The atomic bomb scrapbook is arranged chronologically and begins with the reports on Hiroshima from 6 August 1945. It also covers the release of the "Smyth Report" and its reception by the public.

Smyth's clippings regarding the Oppenheimer case are extensive. They reflect the diversity of opinion in the country and document Smyth's public response to the case. The clippings on the Oppenheimer case, and perhaps other subjects as well, were in large part collected by Mary Smyth (see HDS letter to Templeton Peck, 22 Apr. 1963, Series I). The press accounts of the Strauss hearing discuss many issues involving the U.S. Atomic Energy Commission. The clippings illustrate Strauss' public image, or, at least, the public's opinion of him.

For purposes of conservation, all newspaper clippings, with the exception of the scrapbooks, have been photocopied onto acid free paper. The scrapbooks have been left intact and will be microfilmed; they are stored with the oversized materials at the end of the collection.

contains black and white photographs in various sizes which are organized alphabetically by subject or last name and then chronologically within each file; unidentified material is filed as "unknown." The majority of photographs measure 8x10" or smaller; for the most part, they are filed within two standard size boxes. Larger formats are located in oversize storage and follow the same arrangement as noted above. The earliest image of this series dates 18 December 1885 and depicts Smyth's father, Charles Henry Smyth, Jr., with his 1888 class of chemists and metallurgists at the Columbia College School of Mines. A 1983 photograph of the [Princeton University?] physics faculty and research staff with an elderly Smyth in the front row appears to be the most recent image in Series XIV.

Photographs are those of Smyth, family members, professional associates, events, and places. Smyth's portraits, individual, and group photographs are organized into three folders. As many of his photographs remain undated, these folders have been arranged by Smyth's approximate age. Fortunately, quite a few of Smyth's portraits from infancy through early childhood (often with his elder brother, Charles Phelps Smyth) have been preserved; these date from ca. 1898 through 1905 and depict his early years in birthplace Clinton, New York, to his first year in Princeton, New Jersey at the age of seven. This series is particularly strong as a visual record of Smyth and de Coningh family members. Many of these images were removed from a large folder carrying Mary de Coningh Smyth's monogram.

Series XIV offers a wide range of interesting images which relate to significant events in Smyth's lifetime. An early group photograph of the Cavendish Laboratory at Cambridge University ca. 1922 contains Smyth as a young student as well as colleagues Ernest Rutherford and J. J. Thomson. Other group photographs of note include those involving U.S. AEC and IAEA members, as well as those filed with "Smyth family portraits." The latter folder contains a formal portrait of Henry DeWolf Smyth with father and brother in academic gowns. Throughout Series XIV, individuals who have been identified in group photographs are listed on the outside of folders and are cross-referenced on folders filed under their names as well.

contains a variety of miscellaneous items collected by Smyth during his lifetime and is arranged alphabetically by folder heading. One of the smallest series of the collection, it mainly holds material relating to significant honors and events of Smyth's life and his travels while involved with the IAEA. Two of the most interesting pieces of memorabilia in this series are Smyth's photo I.D. badges used while involved with the Manhattan Project (dated 1944) and Operation Castle (an atomic test at Eniwetok Proving Ground on the Marshall Islands in the winter of 1954).

A portion of the memorabilia consists of documents received at various points in Smyth's education, such as an early Lawrenceville School diploma and Princeton University A.B., A.M., and Ph.D diplomas. Other important items of this nature include certificates of membership for various honorary and professional societies as well as certificates received for his participation in nuclear weapons research and testing. Certificates and medals relating to honors such as Smyth's Atoms for Peace Award (1968) and the Nuclear Statesman Award (1972) are also a part of this series. All medals are stored in the Vault; cross references on folders in the box and the container list direct researchers to request these materials from the Manuscript Librarian.

There is some memorabilia relating to Smyth's travels which dates from his studies at Cambridge University in 1921 through his later years with the IAEA in Vienna. Various maps and tour books can be located in this series, as well as a collection of blank postcards.