{"nrhp_refnum":"76000305","name":"Daly, Reginald A., House","other_names":[],"category":"building","location":{"address":"23 Hawthorn St.","address_restricted":false,"city":"Cambridge","county":"Middlesex County","state":"MA","lat":42.37539398700005,"lon":-71.12634649309466,"geom_source":"nps_gis"},"listed_date":"1976-01-07","is_nhl":true,"nhl_designated_date":"1976-01-07","areas_of_significance":["Science"],"significance_levels":["national"],"summary":{"what_it_is":"A two-story frame house at 23 Hawthorn Street in Cambridge, Massachusetts, probably built in the 1880s or 1890s by an unknown builder, and used as the home of geologist Reginald A. Daly from 1910 to 1957.","why_significant":"The house is significant as the long-time residence of Reginald A. Daly, an internationally recognized geologist at Harvard. His work synthesized field data into theories about the forces shaping the earth, and he applied physics and chemistry to geology. He received major honors, including the Hayden Memorial Geological Award and the presidency of the Geological Society of America in 1932.","narrative":"This two-story frame house on Hawthorn Street in Cambridge, Massachusetts, was probably built in the 1880s or 1890s, though the date and builder are unknown. Its irregular massing, asymmetrical dormers, porches and bays reflect the Queen Anne style, with shingled upper walls over a clapboard first story, a hipped roof and two chimneys. It was the home of geologist Reginald A. Daly from 1910 until his death in 1957. Daly taught at Harvard, where he became Sturgis-Hooper Professor of Geology in 1912. In about 150 books and papers he tried to turn vast amounts of field data into theories about the forces that shape the earth, and he pioneered applying physics and chemistry to geology. His 1914 book on igneous rocks stimulated several generations of geologists. He won the Hayden Memorial Geological Award and led the Geological Society of America in 1932. The exterior is unaltered, and the main house remains a private residence.","period_of_significance":"1910-1957","architect_builder":null,"architectural_style":"Queen Anne with Shingle Style elements","criteria":[],"status_note":"Excellent condition with minor alterations; the main portion remains a private residence, and the basement was partitioned into rooms used as a doctor's office.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:11:54.018469-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/77/7937/63793777/content/electronic-records/rg-079/NPS_MA/76000305_NHL.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/76000305/2402fadf26-800.webp","url_1600":"https://nationalhistoricalregister.com/media/76000305/2402fadf26-1600.webp","licence":"CC BY-SA 3.0","author":"Daderot.","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Reginald_A._Daly_House_(Cambridge,_MA).JPG\" rel=\"noopener\">Daderot.</a>, <a href=\"http://creativecommons.org/licenses/by-sa/3.0/\" rel=\"license noopener\">CC BY-SA 3.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Reginald_A._Daly_House_(Cambridge,_MA).JPG"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/63793777","wikipedia":"https://en.wikipedia.org/wiki/Reginald_A._Daly_House","wikidata":"https://www.wikidata.org/wiki/Q7308570"},"indexable":true,"url":"https://nationalhistoricalregister.com/massachusetts/middlesex-county/daly-reginald-a-house-76000305/"}