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|Creator||James Nasmyth and Company|
|Date of Creation||18 Feb 1851|
|Description||Showing the Hercules with Robert Wilson's patent valve, animated and annotated side elevation with calculations. Drawing roll 87 no 64; then stamped drawing roll 52 no 64. Scale 2 1/2 inches: 1 foot. Signed 'WN Dack'.|
|Media||Ink on paper|