Transit
Gwneuthurwr anhysbys
Ref: John Locke, "Surveyor's Transit," U.S. Patent 7,510 (July 16, 1850).
c. 1850
PH.308905
Image and text © National Museum of American History, 2021
Ble byddwch chi'n dod o hyd i hwn
National Museum of American History
Casgliad barhaol