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1858

Plate XXIV: Principal Triangulation

Survey Book

Principal Triangulation. Plate XXIV. (to …

1858

Plate XXV: Principal Triangulation

Survey Book

Principal Triangulation. Plate XXV. (to …

1858

Plate XXVI: Principal Triangulation

Survey Book

Principal Triangulation. Plate XXVI. (to …

1858

Plate XXVII: Interior of Zenith Sector O …

Survey Book

Interior of Zenith Sector Observatory, s …

1858

Diagram showing the principal triangulat …

Survey Book

Diagram showing the principal triangulat …