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accuracy accurate added adjustment already angle applied arrow base bearing better calculated called carried cause centre chain chainage clamp closing coincide column complete converse correct difference direction distance east equal error exactly example field figures fixed forward give given ground hairs half hand handle horizontal indicated instrument laying length looking lower plate manner marked means measurement meridian and perpendicular method move necessary noted object observed obtained offset operation opposite parallel pole position possible proceed quantities ranging reading reference represent respect road scale seen shew shewn side standard bearing station Suppose survey surveyor taken taking tangent screw telescope theodolite traverse triangle Trig true true bearing turn upper plate usual vernier vertical vertical arc whole
Page 20 - The circumference of a circle is divided into 360 equal parts, called degrees; each degree into 60 minutes ; each minute into 60 seconds.
Page 10 - Then set the instrument level by means of the parallel plate screws, and direct an assistant to go forward with a staff, having a vane, or cross piece, fixed to it exactly at the same height from the ground as the centre of the axis of the telescope. Having gone to the forward station, the assistant must hold the staff upright, whilst the observer measures the vertical angle, which an imaginary line connecting the instrument and staff makes with the horizon ; the instrument and staff should then...
Page 33 - As this adjustment has generally to be repeated every time the instrument is taken out of its case, it may be correctly termed a semipermanent adjustment.
Page 64 - IV. p. 47), so that this line is the hypotenuse of a right-angled triangle, of which the distances to be calculated form the base and perpendicular.