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The Detroit Observatory, an astronomical observatory on the campus of the University of Michigan, was the vision of University of Michigan President Henry Philip Tappan. He recognized the need for institutions of higher education to pursue scientific endeavors. Built in 1854, the Detroit Observatory was named after the Detroit residents who helped finance the building project. Extensive restoration work of the Observatory was completed in 1999.

The Detroit Observatory record group includes administrative materials of the Observatory's later years (post-1994), including documentation on the Observatory's restoration project and materials encompassing the Observatory's publicity and outreach efforts. The collection also contains various historical documents and artifacts such as logbooks and records, photographs and other visual materials, motion pictures, architectural drawings, and publications. The collection includes all of the documents, artifacts, and records transferred to the Bentley Historical Library in 2005. Materials not physically transferred to the Bentley that remain in the Observatory (such as telescopes, clocks, and associated astronomical devices) have not been identified here, but documentation can be found listed in the various inventories and databases found in the administrative series.

This collection contains the following series: Administrative, Publicity and Outreach, Research, Historical, and Publications.

De Witt Clinton Spaulding (circa 1841 or 1842-1926) was a white Michigan resident who served in Company G. of the Union Army's 8th Michigan Infantry regiment during the American Civil War. Included in the collection is Spaulding's physical Civil War diary (which includes comments on his capture and confinement at Andersonville Prison), a transcription of the diary with additional information and images, digitized copies of Spaulding's military service and pension records, scattered physical correspondence and miscellanea, and a DVD-R containing related materials.

The De Witt C. Spaulding papers (0.1 linear feet and 42.5 MB) include scattered correspondence and miscellanea, digitized copies of Spaulding's compiled military service and pension records from the U.S. National Archives and Records Administration, and Spaulding's diary. The physical diary—dated from 1861 to 1864—provides information about Spaulding's Civil War experiences, including his capture and confinement at Andersonville Prison. A digital transcription of Spaulding's diary by Clare M. Cory is also present in this collection. It contains additional biographical and genealogical information, as well as images of Spaulding and his relatives.

Finally, the collection includes a DVD-R containing a transcription of the diary with additional biographical information and photos.

Binkowski was a district judge from Warren, Michigan who collected extensively about Democratic politics and the Polish American community in Michigan. The collection includes materials collected by Binkowski on Democratic politics, the Polish community in Michigan, the cities of Detroit, Warren, and Hamtramck, Michigan, and collected letters, postage covers, and stamps.

The collection includes materials collected by Binkowski on Democratic politics, the Polish community in Michigan, the cities of Detroit, Warren, and Hamtramck, Michigan history in general, and collected letters, postage covers, and stamps. Digital materials include video files and an archived website. Photographs include images of strike violence, 1934-1938, at various Michigan firms; photos of Polish American public figures and organizations, also photos of political meetings and elected officials. Audio cassettes mostly contain recorded interviews with Polish American political figures.

The Dewey papers consist of more than 500 items that concern the Dewey family's business and family life. The collection tracks the movements of Dwight Dewey, physician and land owner, from Iowa, to Washington, and to New York.

The Dewey papers consist of 545 items relating to the Dewey family including 436 letters, 46 financial records, 9 accounts, 12 school exercises, 17 medical books, and 20 miscellaneous items. The bulk of the collection is comprised of letters written to Dwight by his brother Duane; his business partner, E.B. Holden; his uncle, Anson Hart, a banker and realtor in Iowa City; his Keokuk pastor, Reverend John H. Day; and many nieces and cousins. Only a few letters were written by Dwight Dewey. Though almost no mention is made of the Civil War, the letters help to provide insight into civilian life during the war. The letters concern business and family life and track his movements from Iowa to Washington, and to New York.

A substantial number of items relate to the Dewey family's business dealings. The Financial Records series contains receipts for property transactions, commissions and services, real estate taxes, and ledgers from the family store. The Accounts series holds R. Dwight Dewey's physician account books from 1806-1820, 1815-1842, and for 1838; and Dwight C. Dewey's account books for 1848-1851. These books document a doctor's business practices in the first half of the 19th century.

The School Exercises series consists of Dwight Dewey's student essays and penmanship exercises. The Medical Notes series contains detailed notes from some his coursework in medical school. The Medical Books and Journals are notebooks kept by Royal Dwight Dewey while practicing medicine in Turin, New York. He made notes on treatments for colds, syphilis, colic, epilepsy, burns, dysentery, and other ailments, and listed medicinal recipes such as "Pectoral Syrup," "Rheumatic Liniment," and others. There are no accounts of Dwight's medical practice.

Miscellaneous items include wedding invitations; printed materials for the Keokuk Female Seminary, the state University of Iowa, and the Iowa Medical Society; and two lists of medical instruments, one with drawings of scalpel types.

Dwight J. Brewer served in the Michigan Twentieth Infantry during the Civil War. Collection includes family correspondence and Brewer's military papers and diary.

Letters written to the family by Dwight Brewer during the Civil War. Some letters were written together with Edwin Stearns, who served with Brewer. Photocopies and originals of Brewer's military papers and a modern color photograph of an original 1898 family photo.

The Earl V. Moore collection consists of the personal and professional papers of a noted musician, composer and director. Moore taught music at the University of Michigan from 1916 and served as director of the School of Music from1923 until his retirement in 1960.

The papers of Earl V. Moore document his career as professor and dean of the School of Music of the University of Michigan, as well as his career as a composer and performer. Though some of the papers and visual images date from the 1870s, the bulk of the collection dates from the 1920s through the 1960s. Consisting of three linear feet of papers and visual materials, the collection reflects Moore's many accomplishments as conductor, composer, lecturer, organist, and participant in professional societies.

The Moore papers have been divided into seven series: Biographical/Personal Materials, Correspondence, Topical Files, Newspaper Clippings, Musical Scores, Sound Recordings, and Visual Materials.

Residents of Plymouth, Michigan. Three Eddy brothers, Willard, William Hannahs, and Clark, served in the Michigan 2nd and 24th Michigan Volunteer Infantry Regiments in the Civil War. This collection contains family portraits (mostly tintypes, with a few daguerreotypes and ambrotypes as well), wartime correspondence among the Eddy siblings and parents (including several digital scans and transcriptions), family genealogical materials, and a family Bible.

This collection contains family portraits, genealogical material, correspondence among the Eddy siblings and parents, and a family Bible. The correspondence consists of approximately 120 letters, most of which were written during the American Civil War (1860-1865) between the three enlisted brothers, Willard, William and Clark, and their parents, Otis and Lucy. Three of the letters contain accounts of the Battle of Williamsburg (letter dated May 12, 1862), the First Battle of Fredricksburg (letter dated May 26, 1863), and the Second Battle of Fredricksburg (letter dated May 26, 1863). There are also digital scans of six of the letters and digital transcriptions of ten of them.

The family Bible is also included, and the loose leaf genealogical and family record materials that were once interleaved within it have been foldered separately for preservation reasons. There are also two official Union Army documents conferring promotions on Clark Eddy, one for the rank of corporal and the other for the rank of sergeant.

The collection also includes a box of family portraits taken using various early photographic methods. There are four 1/6th plate size portraits framed in “Union Cases,” two of which are tintypes and two of which are daguerreotypes. There are also two 1/9th plate size ambrotypes. The box also contains a leather-bound photograph album of fifteen later portraits of family members, as well as a small Maple Grove Candies box which holds five unframed and uncased tintypes.

Niles, Mich. businessman and officer in the Sixth and Nineteenth Michigan Infantry regiments during the Civil War. Includes correspondence, diaries, and photographs related to Griffin's personal life and military service in addition to genealogical information and miscellaneous materials.

The Eli A. Griffin papers are organized into a single Personal Papers series, which includes family genealogical information, correspondence, personal diaries, photographs, military records, and other materials. The collection documents Griffin's various travels (including trips to the California gold fields in 1849 and 1853 and other trips to Iowa, Missouri, Colorado, and Utah), service in the Union army during the Civil War, and information about his family.

The Elisabeth Barnett Fisher Papers consist of the family letters of Elisabeth Fisher along with financial records, photographs, ephemeral items, and eight miscellaneous items. The most common themes of the letters are family news and finances, fashion, religion, courtship, marriages, deaths, and opinions about the Civil War.

The Elisabeth Barnett Fisher Papers consist of 63 letters to Elisabeth Fisher, 25 financial records, two photographs, 13 ephemeral items, and eight miscellaneous items.

The primary correspondents of the letters in the Correspondence Series are: Gabriel G. Barnett (brother), Hester Ann Barr (sister), Mary A. Hochstetler (sister), Caroline Barnett (sister), Cal M. Barnett (sister), Sarah Barnett (sister-in-law), David D. Barnett (brother), Susannah Fair (sister), E.H. Barnett (sister-in-law), Sarah Ann Senff (cousin), and Jacob Barnett (father). The majority of the 63 letters in the collection were written during the Civil War by family members (48) and friends (15). With the exception of 19 letters from her brother, Gabriel G. Barnett, and 7 letters from her sister, Hester Ann Barr, no other correspondent wrote more than 5 letters; consequently, the subject matter in the collection is very diverse. However, the most common themes throughout the correspondence are family news and finances, fashion, religion, courtship, marriages, deaths, and attitudes and opinions about the Civil War. The solders letters are typically brief and primarily consist of descriptions of camp life. Several of the letters from home include patriotic exhortations; one describes a patriotic rally and another reveals the anti-Lincoln sentiments of an 1860 Democrat. The letters also demonstrated the economic hardships the family suffered as a result of the war.

The Financial Papers Series includes tax bills, receipts, and records of Elisabeth's bills paid for by her son, Erwin G. Barnett, successor to his father’s harness business.

The Photographs, Documents, and Ephemera series contains: 3 'flirtation' cards; a funeral card for the death of a 13 year-old girl; a calling card; 2 cartes-de-visite of a young girl and young man; a Reichsbanknote; several newspaper clippings; Valentine Fisher's confirmation certificate; and George W. Rulow's post of the Grand Army of the Republic transfer card.

The Miscellaneous Series holds two notes on the Barnett/Fisher genealogy.

• Rough pen illustration of two swans, January 15, 1860.
• Pen illustration of a feather, May 28, 1860.
• Rough pen illustration (of a chicken or a saddle), December 31, 1860.
• Pen sketch of a plant, June 6, 1861.
• Pen illustration of a bearded man with hat, January 13, 1864.
• Pen illustration of feathers, undated.
• Two miscellaneous cards have printed illustrations of flowers on them.
• Printed image of an ark, plus additional religious imagery on confirmation document of Valentine Fisher.

The collection also includes several patriotic letterheads and envelopes.

This collection contains the personal correspondence of Levi Henry Elwell and his family. Elwell was a professor in Amherst, Massachusetts, and many of the letters relate to his children's studies at Vassar College and Amherst College, as well as their everyday lives in Massachusetts and New York.

This collection contains 226 personal letters, 8 Greek-language examinations, and 5 loose newspaper clippings regarding Levi Henry Elwell and his family.

The Correspondence series contains letters between and to members of the Elwell family. During his early days as a student at Amherst College and as a teacher in Poughkeepsie, New York, Elwell wrote to his mother, Harriet Adaline Elwell, and fiancée, Abbie Miner Nickerson, about his scholarly life and experiences. In these letters, Levi and Abbie often discussed their engagement and wedding plans. Though later correspondence includes some letters that the couple sent to Levi's parents, most originated from their children, Marion, Florence, and James. The sisters frequently wrote each other to discuss Marion's experiences at Vassar College. They also received mail from various friends, several of whom enclosed sketches. Levi Elwell wrote many of the later letters to his daughter Florence during her studies at Vassar College, including a postcard entirely in Latin (June 1906) and a report on the family's reaction to witnessing Halley's Comet (May 10, 1910). Though the letters primarily concern personal news, correspondents occasionally discussed contemporary politics; in a letter to Marion dated October 30, 1904, Levi described the American political landscape and discussed his own political views. Around 11 newspaper clippings are enclosed in various letters.

The Newspaper Clippings and Exams series has 8 examinations (December 20, 1897-January 20, 1908) for students of Amherst College, who were required to translate and interpret classical Greek texts, printed in their original language. The 5 loose newspaper clippings concern women's colleges (May 14, 1910), faculty promotions at Amherst College (undated), dirigible balloons (undated), and Halley's Comet (2 items, ca. April 1910).