United States Naval Observatory 6-inch Clark refractor
                        
                            GPTKB entity
                        
                    
                Statements (13)
| Predicate | Object | 
|---|---|
| gptkbp:instanceOf | gptkb:astronomer | 
| gptkbp:aperture | 6 inches | 
| gptkbp:commissioned | 1873 | 
| gptkbp:historicalSignificance | oldest telescope in regular use in the United States | 
| gptkbp:locatedIn | gptkb:United_States_Naval_Observatory | 
| gptkbp:manufacturer | gptkb:Alvan_Clark_&_Sons | 
| gptkbp:telescopeType | refractor | 
| gptkbp:usedBy | gptkb:United_States_Naval_Observatory | 
| gptkbp:usedFor | gptkb:astronomer public tours | 
| gptkbp:bfsParent | gptkb:6-inch_Clark_refractor | 
| gptkbp:bfsLayer | 6 | 
| https://www.w3.org/2000/01/rdf-schema#label | United States Naval Observatory 6-inch Clark refractor |