May have been born on the 28th.
==
Washington Post, 15 February 1910, page 1:
TALKS ON COST OF LIVING.
Mr. Yeagle Tells Labor Union of Progress of League.

The effect of the high cost of living on the condition of the laboring man, and the efforts the National Anti-Food-Trust League is making to bring down the prices of foodstuffs, were explained at a meeting last night of the Central Labor Union in Typographical Temple, by J. Lynn Yeagle, president of the board of managers of the league. Mr. Yeagle said no class of society is more interested in the prevailing inflation of values than the laboring class. He outlined the progress the Anti-Food-Trust League has made since its organization a few weeks ago.

A resolution was adopted denouncing the verdict of guilty against the United Hatters of North America, in the suit brought by Loewe & Co.
==
Washington Post, 23 December 1911, page 5:

IN THE SUPREME COURT OF THE DISTRICT of Columbia. No. 772, Bankruptcy. To the creditors of John Lynn Yeagle, bankrupt: Notice is hereby given that on the 6th day of December, 1911, the said John Lynn Yeagle was duly adjudicated bankrupt, and that the first meeting of his creditors will be held at my office, No. 508 Calumbian [sic] Building, No. 416 Fifth street northwest, Washington, D.C., on the 2D DAY OF JANUARY, 1912, at 11 o'clock a.m. at which time the said creditors may attend, prove their claims, appoint a trustee, examine the bankrupt, and transact other business as may properly come before said meeting. E.S. McCALMONT, Referee in Bankruptcy.
==
Washington Post obituary (see sources):

John Lynn Yeagle Dies in Lake While Boating
Philadelphia Newspaper Man was Formerly Member of the Post Staff.
Stroke Causes Death
Special to The Washingtin Post.

Philadelphia, Aug. 1. -- John Lynn Yeagle, well known Washington and Philadelphia newspaper man, was drowned late today at Alcyon Park lake, Pitman Grove, N.J., following a stroke suffered while boating. His body was found floating at the lower end of the lake two hours after he had hired a rowboat. Coroner Burkett believes that Mr. Yeagle suffered a stroke as he rowed around the lake and that he fell into the water from the skiff.

Mr. Yeagle, who was a member of the Public Ledger staff, came here from Washington; he was 54 years old.

Mrs. Yeagle and three of their children, who had motored to Atlantic City, were notified of the tragedy tonight. Mr. Yeagle and his family had been occupying their summer hour at Putman Grove.

Besides his wife, he leaves four children, Jean, 20; Frances, 12; Charles, 6, and a married daughter in Kentucky. Funeral services will be held Wednesday with burial in Clyde, Ohio.

Mr. Yeagle became a member of The Post's editorial staff in 1913, after having been employed by the Washington Herald. He was city editor of The Post for four years and later he was Sunday editor. Before coming to Washington he was engaged in newspaper work in Chicago.

Mr. Yeagle was born in Ohio and was graduated from Oberlin university. He was a member of the Episcopal church and the Masonic fraternity. He was a charter member of the National Press club and its first treasurer.

• Married: 26 DEC 1899 in (prob) Louisville, Jefferson County, Kentucky ¹¹
• Note: Date of marriage estimated from birth of oldest child.

1. Ruth Constance Yeagle b: 20 MAR 1901 in Chicago, Cook County, Illinois
2. Jean Lynn Yeagle b: 27 JUN 1903 in Chicago, Cook County, Illinois

• Married: 21 APR 1912 in Washington, DC ^{12 13}
• Note:

  Washington Post, 21 April 1912, page ES3 (Society section):
  
  John Lynn Yeagle, of this city, formerly of Chicago, was married yesterday afternoon to Miss Evadne V. Cady, of Ballinger, Tex., daughter of Henry A. Cady, postmaster of that city. The ceremony was performed at the residence of Mr. Yeagle, in the Garfield, by the Rev. Edward S. Hale, of the Church of the Ascension the rector, the Rev. Dr. Henning Nelms, giving the blessing.
  
  Mr. Yeagle has been seriously ill for the last six weeks, and was removed to his home from a hospital only yesterday afternoon. Mrs. Yeagle is a sister of Mr. Yeagle's first wife, who died several years ago.

1. Frances Yeagle b: 9 AUG 1913 in Philadelphia, Pennsylvania
2. Living Yeagle

1. Title: Personal Correspondence: Sarah Jean (Walker) Shaw
   Author: Shaw, Sarah to Roma Walker
   Publication: 12 November 1992
   Note: Extensive family information on Silas Anderson Walker's side, primarily the descendents of John Charles Walker. Mostly citing Ruth Constance Yeagle's papers or Ruth's memory.
   Repository:
   Media: Letter
   Text: quotes Ruth Constance (Yeagle) Walker's birthday book giving date of 28 December 1872
2. Title: World War 1 Draft Registration Cards, 1917-1918
   Publication: Ancestry.com, Provo, Utah, 2005
   Note: Original data: United States, Selective Service System. World War I Selective Service System Draft Registration Cards, 1917-1918. Washington, D.C.: National Archives and Records Administration. M1509, 4,582 rolls.
   Repository:
   Media: Electronic
   Page: John Lynn Yeagle, Washington, DC
   Text: born 28 December 1872
3. Title: Obituary: John Lynn Yeagle
   Author: Washington Post, The
   Publication: 2 August 1925, page 13
   Note: Transcription in his notes. Purchased online.
   Repository:
   Media: Newspaper
   Text: "drowned late today at Alcyon Park lake, Pitman Grove, N.J., following a stroke suffered while boating"
4. Title: Personal Correspondence: Sarah Jean (Walker) Shaw
   Author: Shaw, Sarah to Roma Walker
   Publication: 12 November 1992
   Note: Extensive family information on Silas Anderson Walker's side, primarily the descendents of John Charles Walker. Mostly citing Ruth Constance Yeagle's papers or Ruth's memory.
   Repository:
   Media: Letter
   Text: died 1 August 1925
5. Title: New Jersey Deaths and Burials, 1720-1988
   Publication: FamilySearch.org
   Note: Standard index of death certificates plus spare earlier information. Index is quite sparse in many modern years.
   Repository:
   Media: Electronic
   Text: John Lynn "Yeagley", male, died 5 August 1925 [no county]
6. Title: Obituary: John Lynn Yeagle
   Author: Washington Post, The
   Publication: 2 August 1925, page 13
   Note: Transcription in his notes. Purchased online.
   Repository:
   Media: Newspaper
   Text: "Funeral services will be held Wednesday with burial in Clyde, Ohio"; burial assumed to be same day but may have been later
7. Title: Obituary: John Lynn Yeagle
   Author: Washington Post, The
   Publication: 2 August 1925, page 13
   Note: Transcription in his notes. Purchased online.
   Repository:
   Media: Newspaper
   Text: see his notes for details
8. Title: Obituary: John Lynn Yeagle
   Author: Washington Post, The
   Publication: 2 August 1925, page 13
   Note: Transcription in his notes. Purchased online.
   Repository:
   Media: Newspaper
   Text: "graduated from Oberlin university"
9. Title: Obituary: John Lynn Yeagle
   Author: Washington Post, The
   Publication: 2 August 1925, page 13
   Note: Transcription in his notes. Purchased online.
   Repository:
   Media: Newspaper
   Text: "member of the Episcopal church"
10. Title: World War 1 Draft Registration Cards, 1917-1918
    Publication: Ancestry.com, Provo, Utah, 2005
    Note: Original data: United States, Selective Service System. World War I Selective Service System Draft Registration Cards, 1917-1918. Washington, D.C.: National Archives and Records Administration. M1509, 4,582 rolls.
    Repository:
    Media: Electronic
    Page: John Lynn Yeagle, Washington, DC
    Text: medium height and build, blue eyes, brown hair
11. Title: Nicholas Cady of Watertown, Massachusetts 1645-1910
    Author: Allen, Orrin Peer
    Publication: 1910: The author, Press of C.B. Fisk and Company
    Note: History of the Cady family. Book has been digitized by Google Books and is available online.
    Repository:
    Note: http://books.google.com/books?id=Cg87AAAAMAAJ
    Media: Book
    Text: Anita Eloise Cady, daughter of Henry Albert Cady and Helena L. Maxwell, born 6 September 1877 in Little Rock, Arkansas, died 5 September 1905 in Chicago, Illinois, married John Lynn Yeagle 25 December 1899 in Louisville, Kentucky
12. Title: Yeagle-Cady Wedding
    Author: Washington Post, The
    Publication: 21 April 1912, page ES3
    Note: Copy in John Lynn Yeagle's notes. Mention of his second wedding, to Anita's sister.
    Repository:
    Media: Newspaper
    Text: "John Lynn Yeagle, of this city, formerly of Chicago, was married yesterday afternoon to Miss Evadne V. Cady, of Ballinger, Tex."
13. Title: World War 1 Draft Registration Cards, 1917-1918
    Publication: Ancestry.com, Provo, Utah, 2005
    Note: Original data: United States, Selective Service System. World War I Selective Service System Draft Registration Cards, 1917-1918. Washington, D.C.: National Archives and Records Administration. M1509, 4,582 rolls.
    Repository:
    Media: Electronic
    Page: John Lynn Yeagle, Washington, DC
    Text: nearest relative is "Evadine Cady", explicitly listed as wife