Canadian mining journal January-June 1905 . TELESCOPE ON TOP TELESCOPE AT SIDE For vertical sightine it is also most useful and accurate, as by transferring the linesof both positions of auxiliary, two lines at right angles to each other are transferred downI a shaft which, if produced, will intersect each other exactly under the centre of the in-j struineiit, and no allowance or calculation whatever has to be made to ascertain the centre. 1 STANLEYS NEW ENGINEERS LEVEL. Price 1,1st post free. Cablegrams : TURNSTII^E, I^ Graat Turnstile, HOLBORN, LONDON, ENGLAND.

---

Size: 2285px × 1094px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bookcentury1900, bookdecade1900, booksubjectminesandmineralresou