Cross-Section of the Various Metal Rings Constituting the Machine. THE MEDAN ENGRAVING MACHINE. A Detail of the Ourdan Mechanism Showing the Retaining Pawls. Adaptation of the Pantograph a Device for Engraving Sounding Depths Upon Charts. The Machine Set for Engraving the Compass Card. The Ourdan Engraving Machine in Use. me machine Set for Cutting Letters and A Finished Chart Showing the Engraved Compass Card Upon the Accurate Figures on the Compass Cards of Charts. Position of Which the Accuracy of the Chart Depends. THE CURRAN ENGRAVING MACHINE., scientific american, 08-03-14
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