Hints to travellers, scientific and general (1901)
Royal Geographical Society (Great Britain) · London, The Royal Geographical Society · leaf 50
Mints to TitAvEtiEM 32 the intersection of the hairs in the telescope, accurately, on some Vhil- defined distant object, take the reading of the vertical circle, unclamp the instrument, turn it through 180°, reverse the telescope, again place the bubble in the middle of its run by the clip-screws,… … Transit 'theodolite with level on Vernier Arms .
