Surveying ; a manual of practical instruction in the art of plane surveying, including plotting, leveling, triangulation, line running, cross-sectioning, traversing, and other details of field work (1910)
American School of Correspondence, Phillips, Alfred Edward, 1863- [from old catalog] · Chicago, American school of correspondence · leaf 38
re length of the tube, when hor-izontal, or when sliirhtlv inclined to the horizon, thus rendering; itimpossible to tell when the tube is in a truly horizontal jiosition. PLANE SURVEYING The tube i;;, therefore, crround on the inside so that a h;)ngitudinalsection is a seiiinent of a cirele. If… … A line tangent to the circular arc at its highest point, as indi-cated by the middle of the bubble, or a line parallel to this tangent,is called the axis of the bubble tube. This axis will be horizontalwhen the bubble is in the center of the tube. Should the axis beslightly inclined to the…
Surveying
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