Merriman, Mansfield, 1848-1925 · New York Wiley · leaf 249
ceived to beproduced so that it shall be at every place perpendicular tothe plumb-line directions. If a tunnel be driven on the sur-face from ocean to ocean it is evident that the water flowingfrom each would attain equilibrium therein and its levelwould show the form of the geoid along that… … being land and the southern part being the ocean. The full-line curve shows the section of the spheroid, while the lighterline shows that of the geoid. At any station ^ the line SAfis normal to the spheroid, while the line SZ is the directionof the plumb line or of the force of gravity. Hence the…
Geodesy · Surveying
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
