EntityQ4476245· pop 5· linked from 12 articlesJ. Elfreth WatkinsSign in to saveAmerican civil engineerConnectionstankEntityBBCConceptMing dynastyEntityastronautEntityX-rayEntityYuan dynastyEntitysteam locomotiveEntitycomputed tomographyEntitySmithsonian InstitutionEntitymedical ultrasonographyEntityScientific AmericanEntityFind a GraveEntitymining engineeringEntityWorld's Columbian ExpositionEntitymandarinEntityclerkEntityField Museum of Natural HistoryEntityAcelaEntityWan HuEntityJohn BullEntityCategories1852 births1903 deathsAmerican curatorsAmerican mining engineersAmerican people in rail transportationAmerican railway civil engineersGeneral Society of the War of 1812Lafayette College alumniSmithsonian Institution people