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1858

Plate I: Airy's Zenith-Sector

Survey Book

Airy's Zenith-Sector. Plate I. (to accom …

1847

Plate II: Ordnance Survey: Base apparatu …

Survey Book

Ordnance Survey: Base apparatus. Plate I …

1847

Plate III: Ordnance Survey: Base apparat …

Survey Book

Ordnance Survey: Base apparatus. Plate I …

1858

Plate XXVII: Interior of Zenith Sector O …

Survey Book

Interior of Zenith Sector Observatory, s …