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- Patent Model of Dark Lantern, 1872 - From 1790 to 1880, the U.S. Patent Office required applicants to submit a miniature model along with diagrams and written descriptions detailing the operation of their invention. Patent models could be no larger than 12" by 12" by 12". Though they were usually not operational, these models helped explain an inventor's idea and protect it from competitors.
- June 18, 1872
- Collections - Artifact
Patent Model of Dark Lantern, 1872
From 1790 to 1880, the U.S. Patent Office required applicants to submit a miniature model along with diagrams and written descriptions detailing the operation of their invention. Patent models could be no larger than 12" by 12" by 12". Though they were usually not operational, these models helped explain an inventor's idea and protect it from competitors.
- Photographer's Dark Lantern, circa 1880 -
- circa 1880
- Collections - Artifact
Photographer's Dark Lantern, circa 1880