Canadian mining journal January-June 1905 . >?< X <(0HHOO(0 < GQZ30 111 o O(0U 111h lilQ M OZ < fi. o h. TELESCOPE ON TOP TELESCOPE AT SIDE For vertical sighting it is also most useful and accurate, as by transferring the huesof 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

---

Size: 1126px × 2219px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bookcentury1900, bookdecade1900, booksubjectminesandmineralresou