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The bulk of this sous-fonds consists of records documenting Northcott's teaching activities covering nearly twenty-five years. It is principally comprised of lecture notes, laboratory exercises, tests and examinations, class observations and student lists encompassing the years 1945-69. The remainder of the sous-fonds contains correspondence with professional associations, primarily the R.A.S.C. and R.C.I., manuscripts, draft articles and scripts for radio programmes, as well as miscellaneous research materials. It includes a copy of Northcott's 1964 publication list.

This series contains records from three accessions: B1994-0002, B2009-0021, and B2015-0007. The bulk of the files are from accession B1994-0002, and consists of general incoming and out-going correspondence mainly of a professional nature. It is arranged in two parts. The first part consists of files created by Helen Hogg containing correspondence and other accompanying material with individuals, institutions, clubs and associations regarding research, special projects, events, visits, excursions, travel, donations, lectures, awards and publications. For access, these have been arranged alphabetically by file title. Some of the more notable correspondence are with colleagues such as Amelia Whelau (University of Western Ontario), Steven Van Agt (Germany), Martha Liller (Harvard Observatory), Bart J. Bok (Harvard and Australia), Chu Yu-Hua (China), and there is also extensive correspondence with Harlow Shapley, director of the Harvard College Observatory and mentor to Prof. Hogg.

The second part of this series consists of miscellaneous correspondence arranged by decade. Far from being extraneous pieces, this correspondence is quite extensive and reveals much about her professional activities and on-going research. These files contain the largest volume of correspondence documenting both her and Frank Hogg's early career in the 1930s and 1940s. These files were created from loose correspondence within the records or from files, which were clearly miscellaneous.

Researchers should note that while this series does not represent the whole of the Hogg correspondence (much of which is specific to each series), it is a good representation of the scope of her interests and activities. Some of the correspondence relates directly to records in other series and researchers should bear this in mind when investigating a particular topic.

Series includes short stories and poetry written by Dr. Hogg. Also included are some collected poems and a quotations book.

Records in this sous-fonds offer a good outline of the educational and professional achievements of Frank Scott Hogg. Correspondence, lecture notes and related teaching files, research notes and draft manuscripts of articles all document his professional career as an astronomer. There are also draft articles for his Toronto Star column which, after his death, was taken over by his wife.

Of special mention are the notes, reports, correspondence and blueprints relating to the invention of the two-star sexton, a device designed to simplify astronomical navigation (1940-1943). The project was supported by government grants and the working models, designed and built at the Dunlap Observatory by Dr. Hogg and Dr. R.K. Young, were extensively tested by the Armed forces during World War II. Two original sextants have survived: one is housed at the National Museum of Science and Technology in Ottawa, the other at the Royal Ontario Museum in Toronto.

Nearly half of the records in this sous-fond are Frank Hogg's student papers, documenting his undergraduate course work at the University of Toronto (1922-1926) and subsequent graduate research at Harvard University culminating in his earning the first astronomy Ph.D. from this institution (1926-1929). Course notes, laboratory exercise books, statements of academic standing and scholarships provide a record of the structure and content of his education over a seven-year period. Books III, IV and V of research observations used for his Ph.D. thesis have survived along with a copy of his thesis. Books I, II and VI of his Ph.D. research were acquired earlier by the University of Toronto Archives and can be found in accession B82-0026. There are also some photos that relate to his education including his graduation portrait from the University of Toronto (1925).

In terms of personal papers, there is a small sampling of correspondence that has been filed at the beginning with his professional correspondence. For the period after 1930, correspondence found in Series I and X of the Helen Hogg fond is far more extensive. There are a few files that show his involvement in the Presbyterian Church, the Lions Club, and the Richmond Hill District High School Board that he chaired from 1949-50. Some memorabilia and some biographical files complete this scant collection of his personal life.

This series consists of 27 diaries and 3 appointment/address books. The former is particularly valuable in chronicling, if only intermittently, the personal and professional life of Dr. Hogg over a 60-year span. Notable among these is her 1958 Russia diary that describes her attendance at the 10th General Assembly of the International Astronomical Union in Moscow.

Includes slides and photoprints documenting both Dr. Hogg's personal and professional life including family gatherings and events, trips, astronomical conferences, ceremonies, visits to various observatories. Also included are images she collected regarding the history of Astronomy as well as publicity shots of her taken for various publications.

Photoprints from B1996-0020 document the meeting of the International Astronomical Union Held in the Soviet Union [Russia], 1958. Helen Hogg, as well as other Canadian astronomers including A. Batten and S. van de Bergh, were present and can be seen in these shots.

Photoprints from accession B1994-0002 include colour and black and white prints grouped into the following and arranged chronologically within:

• Family Photographs
• Formal Portraits and Publicity Shots
• Awards and Degrees
• Astronomical Photographs

B1996-0002 documents the meeting of the International Astronomical Union Held in the Soviet Union, 1958.

B2015-0007 includes family and astronomical photographs.

Includes invitations, certificates, guest books, Helen Hogg's Baby Book, and scrapbooks. Also includes diplomas, awards and honorary degrees.

This fonds contains the personal and professional papers of Dr. Helen Sawyer Hogg documenting her contribution to professional astronomy, her high regard as a popular educator as well as her responsibilities as a parent, daughter, wife and friend. The records have been arranged into series either by type of record or to reflect a certain type of activity. Records documenting various aspects of her career are filed first, followed by papers reflecting her personal life.

Included is both professional and personal correspondence; records relating to her activities on associations, boards and organizations; records such as draft manuscripts, correspondence and outlines and data relating to her publishing activities and research; papers relating to her education and her teaching responsibilities; as well as diaries and family papers series.

Because Dr. Hogg's career spanned nearly seven decades during a time astronomy as a discipline was still developing both nationally and internationally, these records are not only useful to those researching Dr. Hogg's achievements but will be insightful to those researchers studying the development of astronomy as a science and profession. Moreover, Dr. Hogg was a woman in a field of science, which is still dominated by men. Those studying women's history may find Dr. Hogg's personal records a useful case study in one woman's success in a largely male dominated profession.

Contained within the Helen S. Hogg personal records are three sous-fonds: Frank S. Hogg [1922-1952], her first husband and also an astronomer at the David Dunlap Observatory; Prof. Ruth Northcott [1932-1969], close personal friend and professional colleague of Helen Hogg, also on staff at the D.D.O.; Dr. C.A. Chant [193- - 194-], director emeritus of the D.D.O and head of the Department of Astronomy at the University of Toronto from 1904-1935. These sous-fonds are individually described and have been filed after the Helen Hogg personal records.

This series contains extensive correspondence from family and friends documenting Dr. Hogg's personal relationships throughout her lifetime. The bulk of it is incoming correspondence, which has been filed by year to impose some order. Filed at the beginning are some files created by Dr. Hogg which also include outgoing correspondence. This is usually filed by correspondent chronologically.

Of significance are the courtship letters between Helen and Frank in the late 1920s, as well as her letters home to her family in Dunstable from the Dominion Observatory in Victoria B.C. and later from the David Dunlap Observatory in Toronto. These letters not only lend insight into their personal lives during these early years but detail, as well the progress of their astronomical work and the general activities at each observatory. They would be useful to anyone researching early astronomy in Canada.

Researchers should note that most of this correspondence was found loose and that attempts to sort it and identify it as personal have been made. However, some of the correspondence may relate directly to professional activities and will inevitably discuss professional as well as personal matters.

This series, made up from small items that were found while sorting through this accession, is evidence of Dr. Hogg's keen sense of family history. Most relate to Carrie Sawyer-Douglass and Walter Douglass, her mother and stepfather. There are also some notes on family history and a folder of 19th century documents. Perhaps the most interesting records are a series of daily diaries dated from 1901 to 1909 and 1924 to 1941, kept by Leonora Knapp Battles, a cousin and close friend of Carrie Sawyer.

Images of Helen as a baby and child growing up in Dunstable; snapshots of her and Frank in the 1930s and 1940s including images with their children in Richmond Hill; photos of her parents and Auntie Lenora with whom she grew up. Views of her grand children and great-grandchildren. Wedding portrait of Frank and Helen Hogg as well as more informal photograph of her and Dr. Priestly when they were married in 1985.

Images of Helen as a baby and child growing up in Dunstable; snapshots of her and Frank in the 1930s and 1940s including images with their children in Richmond Hill; photos of her parents and Auntie Lenora with whom she grew up. Views of her grand children and great-grandchildren. Wedding portrait of Frank and Helen Hogg as well as more informal photograph of her and Dr. Priestly when they were married in 1985.

Images of Dr. Hogg receiving Honorary degrees from Mt Holyoke College and University of Lethbridge as well as being invested into the Order of Canada in 1969. Also includes receipt of other awards and honours including the dedication of the Helen Sawyer Hogg Observatory in Ottawa, 1989.

Images of Dr. Hogg receiving Honorary degrees from Mt Holyoke College and University of Lethbridge as well as being invested into the Order of Canada in 1969. Also includes receipt of other awards and honours including the dedication of the Helen Sawyer Hogg Observatory in Ottawa, 1989.

Includes portraits of Dr. Hogg taken at various stages of her life. Many of the publicity photos taken for publications feature Dr. Hogg at work at the Observatory the earliest being 1938 and the latest taken in 1991. There are also a few images documenting her time as a director of Bell Canada and her activities relating to the Noranda Lectures for EXPO.

Includes views of the David Dunlap Observatory Staff (the earliest dates 1939); group photos and informal images documenting meetings and events of astronomical associations such as the Canadian contingent to the IAU meeting in Dublin in 1955, a reception of the RASC in 1958, the IAU 1961 meeting at Berkley, the IAU National Committee for Canada meeting in Toronto, 1964, Sir Charles Wright RCI lecture at the University of Alberta, 1965, meeting of the AAVSO in 1983 and several others; photos used in the RASC journal and other images of observatories and/or astronomical observations which were sent to her as a result of her popularity among the general public; some historical photographs including images of Harlow Shapley at work, portraits of J.S. Plaskett early director of the Dominion Astrophysical Observatory, and his successor Joseph Pearce and, of some significance, three group photos of meetings of Canadian and American astronomers ca. 1908-191-.

Includes portraits of Dr. Hogg taken at various stages of her life. Many of the publicity photos taken for publications feature Dr. Hogg at work at the Observatory the earliest being 1938 and the latest taken in 1991. There are also a few images documenting her time as a director of Bell Canada and her activities relating to the Noranda Lectures for EXPO.

Includes views of the David Dunlap Observatory Staff (the earliest dates 1939); group photos and informal images documenting meetings and events of astronomical associations such as the Canadian contingent to the IAU meeting in Dublin in 1955, a reception of the RASC in 1958, the IAU 1961 meeting at Berkley, the IAU National Committee for Canada meeting in Toronto, 1964, Sir Charles Wright RCI lecture at the University of Alberta, 1965, meeting of the AAVSO in 1983 and several others; photos used in the RASC journal and other images of observatories and/or astronomical observations which were sent to her as a result of her popularity among the general public; some historical photographs including images of Harlow Shapley at work, portraits of J.S. Plaskett early director of the Dominion Astrophysical Observatory, and his successor Joseph Pearce and, of some significance, three group photos of meetings of Canadian and American astronomers ca. 1908-191-.