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| Title | Elevation |
|---|---|
| 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'. |
| Archive Reference | NAS/1/17/1/1 |
| Media | Ink on paper |
| Dimensions | 515x620 mm |