Subterraneous Surveying: With and Withour the Magnetic Needle

6th column 80 links ABCD ABCDF angle formed bearing and distance Bearing Lengths bearing of F centre chains of easting chalk mark circumferentor cloth colliery commencing Construction Crown 8vo D. K. CLARK degrees contained different meridians direction draw the line Electrical Engineer equal EXAMPLE Fcap Fix the instrument following subterraneous survey form an angle Fourth Edition headways horizontal distance Illustrations Inst instrument whose needle let the bearing magnetic needle magnetic variation magnitude meridian line meridian NS method Mining number of degrees object will bear pit G plan's meridian Plates plotted Practical Treatise PREPARATORY TABLE remove the instrument Revised S. E. or W. N. second bearing Second Edition shaft south magnetic meridian student subterraneous excavation Suppose the bearing surface survey-book surveyor Take the bearing tance theodolite theorem Third Edition traverse tables true meridian W 8 chains W. N. or S. E. west variation wish to know