Heliostat
{"id": "ld1-1643399625297-1643399667434-0", "version": "", "unitCode": "NMAH", "linkedId": "", "type": "edanmdm", "content": {"descriptiveNonRepeating": {"record_ID": "nmah_1817622", "online_media": {"mediaCount": 2, "media": [{"thumbnail": "https://ids.si.edu/ids/deliveryService?id=NMAH-AHB2017q126672&max=150", "idsId": "NMAH-AHB2017q126672", "usage": {"access": "CC0"}, "guid": "http://n2t.net/ark:/65665/bq99ca746bc-f595-704b-e053-15f76fa0b4fa", "type": "Images", "content": "https://ids.si.edu/ids/deliveryService?id=NMAH-AHB2017q126672", "resources": [{"width": 2250, "height": 3000, "label": "High-resolution JPEG", "url": "https://ids.si.edu/ids/download?id=NMAH-AHB2017q126672.jpg", "dimensions": "2250x3000"}, {"label": "Screen Image", "url": "https://ids.si.edu/ids/download?id=NMAH-AHB2017q126672_screen"}, {"label": "Thumbnail Image", "url": "https://ids.si.edu/ids/download?id=NMAH-AHB2017q126672_thumb"}]}, {"thumbnail": "https://ids.si.edu/ids/deliveryService?id=NMAH-AHB2017q126673&max=150", "idsId": "NMAH-AHB2017q126673", "usage": {"access": "CC0"}, "guid": "http://n2t.net/ark:/65665/bq99ca746bc-f596-704b-e053-15f76fa0b4fa", "type": "Images", "content": "https://ids.si.edu/ids/deliveryService?id=NMAH-AHB2017q126673", "resources": [{"width": 2250, "height": 3000, "label": "High-resolution JPEG", "url": "https://ids.si.edu/ids/download?id=NMAH-AHB2017q126673.jpg", "dimensions": "2250x3000"}, {"label": "Screen Image", "url": "https://ids.si.edu/ids/download?id=NMAH-AHB2017q126673_screen"}, {"label": "Thumbnail Image", "url": "https://ids.si.edu/ids/download?id=NMAH-AHB2017q126673_thumb"}]}]}, "unit_code": "NMAH", "title_sort": "HELIOSTAT", "guid": "http://n2t.net/ark:/65665/ng49ca746b2-c263-704b-e053-15f76fa0b4fa", "title": {"label": "Title", "content": "Heliostat"}, "metadata_usage": {"access": "CC0"}, "data_source": "National Museum of American History"}, "indexedStructured": {"date": ["1900s"], "geoLocation": [{"Other": {"type": "Place", "content": "United States"}}, {"Other": {"type": "Place", "content": "Pennsylvania"}}, {"Other": {"type": "Place", "content": "Pittsburgh"}}, {"Other": {"type": "Place", "content": "Allegheny City"}}], "object_type": ["heliostat"], "name": ["Brashear, John A."], "topic": ["Scientific apparatus and instruments", "Science"], "place": ["United States", "Allegheny City", "Pennsylvania", "Pittsburgh"], "online_media_type": ["Images"]}, "freetext": {"setName": [{"label": "See more items in", "content": "Medicine and Science: Physical Sciences"}], "date": [{"label": "date made", "content": "around 1900"}], "identifier": [{"label": "ID Number", "content": "PH.315644"}, {"label": "catalog number", "content": "315644"}, {"label": "accession number", "content": "217544"}], "notes": [{"label": "Description", "content": "A heliostat throws sunlight where it might be used for photography or scientific observations. This example (half of a two-mirror instrument) has a silvered-glass octagonal mirror, clockwork mechanism, and tripod base with leveling screws. The \u00e2\u0080\u009cJ. A. Brashear, Allegheny, Pa. 10\u00e2\u0080\u009d inscription refers to John A. Brashear, a sell-taught optician who, with financial backing from William Thaw, a local philanthropist, could quit his job in a steel mill and devote his energies to making telescopes and related scientific apparatus. In 1886, again with help from Thaw, Brashear established an instrument shop in Allegheny, then a suburb of Pittsburgh."}, {"label": "Description", "content": "Brashear\u00e2\u0080\u0099s involvement with heliostats began in the summer of 1881 when Samuel Pierpont Langley, the director of the Allegheny Observatory, asked him to re-silver the surfaces of three heliostat mirrors that he would take to Mount Whitney for his pioneering researches on the solar heat. One was for a one-mirror heliostat that Alvan Clark & Sons had made for the recent transit of Venus. The other two were for a two-mirror heliostat made by William Grunow, the German immigrant who also made Langley\u00e2\u0080\u0099s early bolometers."}, {"label": "Description", "content": "Ref: John A. Brashear, <i>Catalogue</i> (Allegheny, 1906), p. 35."}, {"label": "Description", "content": "John A. Brashear, Letter to the Editor, <i>Scientific American</i> 45 (1881): 113."}, {"label": "Description", "content": "Samuel P. Langley, <i>Researches on Solar Heat and Its Absorption by the Earth\u00e2\u0080\u0099s Atmosphere</i> (Washington, D.C., 1884), p. 132."}, {"label": "Location", "content": "Currently not on view"}], "creditLine": [{"label": "Credit Line", "content": "United States Military Academy"}], "name": [{"label": "maker", "content": "Brashear, John A."}], "topic": [{"label": "subject", "content": "Science & Scientific Instruments"}], "place": [{"label": "place made", "content": "United States: Pennsylvania, Pittsburgh, Allegheny City"}], "physicalDescription": [{"label": "Measurements", "content": "overall: 15 in; 38.1 cm"}, {"label": "Measurements", "content": "overall: 15 in x 12 1/2 in x 17 3/4 in; 38.1 cm x 31.75 cm x 45.085 cm"}], "dataSource": [{"label": "Data Source", "content": "National Museum of American History"}], "objectType": [{"label": "Object Name", "content": "heliostat"}]}}, "url": "edanmdm:nmah_1817622", "hash": "c7cf5f0bfda9795a46997b7aa7565263b7d31e1c", "docSignature": "4974f92a42a1bf0e8cb0a89a3886be16", "timestamp": 1663336903, "lastTimeUpdated": 1653680696, "title": "Heliostat"}