In 1897 Hamilton accepted an offer to become a professor of pathology at the Woman's Medical School of Northwestern University. Soon after her move to Chicago, Illinois, she fulfilled a longtime ambition to become a member and resident of Hull House, the settlement house founded by social reformer Jane Addams and Ellen Gates Starr. While Hamilton taught and did research at the medical school during the day, she maintained an active life at Hull House, her full-time residence from 1897 to 1919. Hamilton became Jane Addams' personal physician and volunteered her time at Hull House to teach English and art. She also directed the men's fencing and athletic clubs, operated a well-baby clinic, and visited the sick in their homes. Although she had moved away from Chicago in 1919 when she accepted a position as an assistant professor at Harvard Medical School, Hamilton returned to Hull House and stayed for several months each spring until Addams's death in 1935.  Through her association and work at Hull House and living side by side with the poor residents of the community, Hamilton witnessed the effects that the dangerous trades had on workers' health through exposure to carbon monoxide and lead poisoning. As a result, she became increasingly interested in the problems the workers faced, especially occupational injuries and illnesses. The experience also caused Hamilton to begin considering how to merge her interests in medical science and social reform to improve the health of American workers.  When the Woman's Medical School closed in 1902, Hamilton took a position as bacteriologist with the Memorial Institute for Infectious Diseases, pursued studies at the Pasteur Institute in Paris, France, and investigated a typhoid epidemic in Chicago before focusing her research on the investigation of industrial diseases. Some of Hamilton's early research in this area included attempts to identify causes of typhoid and tuberculosis in the community surrounding Hull House. Her work on typhoid in 1902 led to the replacement of the chief sanitary inspector of the area by the Chicago Board of Health.  The study of industrial medicine (work-related illnesses) had become increasingly important because the Industrial Revolution of the late nineteenth century had led to new dangers in the workplace. In 1907 Hamilton began exploring existing literature from abroad and noticed that industrial medicine was not being studied as much in America. She set out to change the situation and published her first article on the topic in 1908.

Answer this question "what was the chicago hull house?" by extracting the answer from the text above.
settlement house founded by social reformer Jane Addams and Ellen Gates Starr.