Education
He attended the common schools. He completed preparatory studies and was graduated from the medical department of the University of Vermont at Burlington in 1859.
He attended the common schools. He completed preparatory studies and was graduated from the medical department of the University of Vermont at Burlington in 1859.
Born in Saint John"s, Canada, Platt moved to Burlington, Vermont. During the Civil War he entered the Union Army as first sergeant of the Third Regiment, Vermont Volunteer Infantry. He served as captain and lieutenant colonel.
He declined assignment to duty as chief quartermaster of the Sixth Corps.
He settled in St. Petersburg, Virginia, April 6, 1865. He moved to Norfolk, Virginia.
Upon the readmission of the State of Virginia to representation Platt was elected as a Republican to the Forty-first, Forty-second, and Forty-third Congresses and served from January 26, 1870, to March 3, 1875. He served as chairman of the Committee on Public Buildings and Grounds (Forty-third Congress).
He was an unsuccessful candidate for reelection in 1874 to the Forty-fourth Congress.
He moved to New York in 1876 and engaged in the manufacture of oil products. He moved to Colorado in 1887 and settled in Denver. He engaged in the insurance business, paper manufacturing, and in mining.
He was drowned in Green Lake, near Georgetown, Colorado, August 13, 1894.
He was interred in Fairmount Cemetery, Denver, Colorado.
He served as member of the State constitutional convention in 1867. He served as member of the city council in 1867 and 1868.