Carleton School was a college preparatory
boarding school in
Massachusetts. There are three notable periods that defined
Carleton School; it was originally a girls' school, later was a boys' school, and became a military school at the end of its operation. In 1868, the school was located in
Medford, Massachusetts. It was called I.N. Carleton's Home and Day School for Young Ladies. In 1869, Carleton set aside running a private school and went to the New Britain State Normal School (now
Central Connecticut State University) in
New Britain, Connecticut as its fifth principal. He served there until 1881. In 1884, Carleton started a new private school. It was referred to as I.N. Carleton's Home and Day School for Boys in 1886, located in
Bradford Massachusetts. This was the longest and most defining period in its operation as a boys' preparatory school. By 1896, it was simply called Carleton School. The last period of the school's existence was possibly the most dramatic change. It was renamed The Carleton Military School in approximately 1901. Carleton still held the position of principal, but a Major Baker ran the military instruction, having previously been a military instructor at
Harvard University summer school. Carleton died 8 August 1902, two months after the expected end of the school year. The location of the school continued to be used as a boarding house, called the Carleton House for Boys and Young Men in approximately 1925. The school buildings still stand near the corner of Chadwick and South Main Street in
Haverhill, and are used as apartments. ==American Institute of Instruction==