Canadian mining journal January-June 1905 . >? < D< V)hHOO(0I <z DQ o 0) 111 J[ Mih UiQ to QZ< TELESCOPE ON TOP TELESCOPE AT SIDE For vertical sighting it is also most useful and accurate, as by linesof both positions of auxiliary, two lines at right angles to each other are transferred downa shaft which, if produced, will intersect each other exactly under the centre of the in-strument, and no allowance or calculation whatever has to be made to ascertain^the centre. STANLEYS NEW ENGINEERS LEVEL

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Keywords: ., bookcentury1900, bookdecade1900, booksubjectminesandmineralresou