CHAPTER XIII.

INSTRUMENTS CONSTRUCTED ESPECIALLY FOR FACILITY OF TAKING

INCLINATIONS:--Inclinometer Theodolite--Gradiometer--Clinometers:

Abney's--Troughton's--De Lisle's--Stanley's--Barker's--Burnier's--

Watkin's--Clinometer Sights--Rule Clinometer--Road Tracer 389

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 13 / 26 章