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.

CHAPTER XI.

Chapter 1138 wordsPublic domain

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