CHAPTER V.

LEVELLING STAVES:--Construction--Various Readings Discussed--

Sopwith's--Field's--Strange's--Stanley's New Metrical--Simple

Construction--Mining Staff--Papering Levelling Staves--

Preservation--Packing Pads--Staff Plate--Staff Level--Practice of

Levelling--Index of Bubble--Lamp--Curvature Corrections--Station

Pegs--Refinement of Levelling--Levelling Books 148

Surveying and Levelling Instruments, Theoretically and Practically Described. For construction, qualities, selection, preservation, adjustments, and uses; with other apparatus and appliances used by civil engineers and surveyors in the field. · 第 5 / 26 章