Astatic needle galvanometer
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Wardlaw, Jr., and Frank A. Wardlaw"}], "name": [{"label": "maker", "content": "Ruhmkorff, Heinrich Daniel"}], "physicalDescription": [{"label": "Measurements", "content": "overall: 10 in x 6 in x 6 in; 25.4 cm x 15.24 cm x 15.24 cm"}, {"label": "Measurements", "content": "cover: 8 1/2 in x 5 in; 21.59 cm x 12.7 cm"}], "dataSource": [{"label": "Data Source", "content": "National Museum of American History"}], "objectType": [{"label": "Object Name", "content": "Galvanometer"}, {"label": "Other Terms", "content": "Galvanometer; Measuring Devices"}]}}, "url": "edanmdm:nmah_706247", "hash": "e15b01f0a7ad8e7e51e122fe5e6fa5cb9ae224ed", "docSignature": "36e766f1168d1d7a5c3c8a0f17c25783", "timestamp": 1663782597, "lastTimeUpdated": 1653680847, "title": "Astatic needle galvanometer"}