introduction of dumpy level
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The dumpy level is an optical surveying leveling instrument consisting a telescope tube firmly secured in two collars fixed by adjusting screws to the stage by the vertical spindle. ... He invented dumpy level in 1832 while using the conventional Y level. A dumpy level is also called a builder's level, an automatic level.
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the dumpy level is an optical surveying leveling instrument consisting a telescope tube firmly secured
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