CHAPTER XI._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.

MINING SURVEY INSTRUMENTS:--Circumferentors--Plain Miner's Dial--

Sights--Tripod Stand--Adjustments--Henderson's Dial--Lean's

Dial--Adjustments--Hedley's Dials--Additional Telescope--Improved

Hedley--Tribrach and Ball Adjustment--Reflectors--Continental

Forms--_Théodolite Souterrain_--Tripod Tables--Stanley's Mining

Theodolite--Pastorelli's and Hoffmann's Adjustable Tripod Heads--

Mining Transit Theodolites--Stanley's Prismatic Mining Compass--

Hanging Dial--Hanging Clinometer--Semi-circumferentor--Mining

Lamps 307

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 11 / 26 章