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Deep borehole surveys and problems. Boring. 130 DEEP BOREHOLE SURVEYS AND PROBLEMS which it is desired to investigate. A strong current is passed through the resistance frame J and allowed on
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![A treatise on land-surveying; comprising the theory developed from five elementary principles; and the practice with the chain alone, the compass, the transit, the theodolite, the plane table, &cIllustrated by four hundred A treatise on land-surveying; comprising the theory developed from five elementary principles; and the practice with the chain alone, the compass, the transit, the theodolite, the plane table, &cIllustrated by four hundred](https://c8.alamy.com/comp/2AKB4BT/a-treatise-on-land-surveying-comprising-the-theory-developed-from-five-elementary-principles-and-the-practice-with-the-chain-alone-the-compass-the-transit-the-theodolite-the-plane-table-cillustrated-by-four-hundred-engravings-and-a-magnetic-chart-till-the-straightened-needlecuts-opposite-didsions-it-is-then-certainthat-the-direction-of-the-needle-passestjirough-the-centre-turn-the-compassbox-one-quarter-around-and-if-the-needle-does-not-then-cut-oppo-site-divisions-move-the-pivot-till-it-does-repeat-the-operation-invarious-positions-of-the-box-it-will-be-a-sufficient-test-if-2AKB4BT.jpg)