{"nrhp_refnum":"94000546","name":"Shell Oil Company \"Spectacular\" Sign","other_names":["Shell Sign (preferred)"],"category":"object","location":{"address":"187 Magazine St.","address_restricted":false,"city":"Cambridge","county":"Middlesex County","state":"MA","lat":42.35648875500004,"lon":-71.11465409499993,"geom_source":"nps_gis"},"listed_date":"1994-06-03","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Other","Art","Commerce","Transportation"],"significance_levels":["local"],"summary":{"what_it_is":"A 68-foot-high illuminated advertising sign shaped like a giant scallop shell, the Shell Oil trademark, at 187 Magazine Street in Cambridge, Massachusetts. It was built in 1933 by the Donnelly Electric Manufacturing Company and moved to this site in 1944.","why_significant":"The nomination argues it is primarily significant under Criterion C as the earliest known surviving 'spectacular' sign in the Boston area and the only one in Cambridge. It combines incandescent and neon lighting, a transitional type from the early use of neon. It is also significant under Criterion A for its link to Shell Oil's history in the Boston area and the commercial development of Memorial Drive.","narrative":"A giant scallop shell, the Shell Oil trademark, rises 68 feet above a service station at Magazine Street and Memorial Drive in Cambridge. Donnelly Electric Manufacturing Company, a Boston sign maker, built it in 1933 for the roof of Shell's regional headquarters on Commonwealth Avenue in Boston. In 1944 it was moved across the Charles River to its present site. A steel-truss frame on concrete footings carries yellow incandescent bulbs outlining the shell, with red neon spelling SHELL at the center. An animator runs a fourteen-second lighting sequence, and a photo-electric cell keeps it dark by day. The sign was listed mainly for its design: it is the earliest known surviving 'spectacular' sign in the Boston area and the only one in Cambridge, and it shows the shift from incandescent to neon lighting. It also reflects Shell's early history in Boston and the commercial and industrial growth along Memorial Drive.","period_of_significance":"1933-1944","architect_builder":"Donnelly Electric Manufacturing Company (DEMCO)","architectural_style":"MODERN MOVEMENT: Moderne","criteria":["A","C"],"status_note":"In continuous use since 1933 and operated by photo-electric cell; bulbs, neon, animator and much wiring have been replaced through maintenance.","vacant_flag":false,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:13:04.232962-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/6/7955/63795506/content/electronic-records/rg-079/NPS_MA/94000546.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/94000546/04714e0105-800.webp","url_1600":"https://nationalhistoricalregister.com/media/94000546/04714e0105-1600.webp","licence":"CC BY 2.0","author":"Nadya Peek","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Shell_spectacular_sign_in_2008.jpg\" rel=\"noopener\">Nadya Peek</a>, <a href=\"https://creativecommons.org/licenses/by/2.0\" rel=\"license noopener\">CC BY 2.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Shell_spectacular_sign_in_2008.jpg"},"district":{"nrhp_refnum":"78000436","name":"Charles River Basin Historic District","url":"https://nationalhistoricalregister.com/districts/massachusetts/charles-river-basin-historic-district-78000436/"},"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/63795506","wikipedia":"https://en.wikipedia.org/wiki/Shell_Oil_Company_%22Spectacular%22_Sign","wikidata":"https://www.wikidata.org/wiki/Q7493683"},"indexable":true,"url":"https://nationalhistoricalregister.com/massachusetts/middlesex-county/shell-oil-company-spectacular-sign-94000546/"}