A treatise on surveying, comprising the theory and the practice (1906)
Gillespie, William Mitchell, 1816-1868, Staley, Cady, 1840- · New York D. Appleton · leaf 350
ned more easily, andwith sufficient accuracy, without the stadia, or to take the topog-raphy for a distance on either side of a line determined by transitand level, as they are employed in railroad survey. These instruments are also used without other means of controlthan the aneroid barometer for… … The Ahney hand level and clinometer (Fig. 504) is a modifica-tion of the Locke level. The level tube is pivoted at the center of 340 TOPOORAPnT. a graduated arc. The bubble is seen by reflection in a mirrorplaced in the upper half of the square tube. When the bubbletube is level the bubble is seen…
Surveying
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