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Measuring Distances by Chaining
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20 feet Abney level accurate adjustment alidade alignment aneroid approximately base line bearing bench marks bridge calculated Cascade Tunnel centre line chain chainage circle co-ordinates computed concrete contours correct cost cross sections degree of accuracy difference distance dumpy level earthworks elevation engineer error field book foot formula grade ground height Hoover Dam Hypsometer inch instrument Invar Kampala Kenya length line of sight measured method micrometer miles nearest necessary observations obtained offset ordinary pegs photographs pier pipe placed plane table plates plotted plumb bob position possible preliminary survey prisms railway reading reconnaissance reduced right angles road route scale screw shaft shown side slide rule slope spirit level spot shots stadia staff staking station steel tape surveyor tacheometer taken tangent telescope temperature theodolite transit triangulation tripod true north tunnel Uganda Railways vernier vertical angle wire