Problems in Surveying, Railroad Surveying and Geodesy: With an Apendix on the Adjustments of the Engineer's Transit and Level |
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Problems in Surveying, Railroad Surveying and Geodesy: With an Appendix on ... Howard Chapin Ives No preview available - 2015 |
Common terms and phrases
absolute length adjustment altitude aneroid angular azimuth base-line bring the bubble center line Chromatic Aberration computed contour correction cross-hairs cross-section cross-wires culmination declination determined Diff difference in elevation direct distance dumpy level Engineer's transit equal Equipment eyepiece feet field field-book form of notes give given in Problem grade graduation Greenwich mean hatchet horizontal axis index error instrument intersection interval latitude Left-hand Levelman line of collimation measuring the angles method micrometer micrometer-head Note-keeper observation obtained offsets parallel perpendicular placed plane plumb-bobs Polaris position Problem G3 range-poles reading Rear Chainman reticule right ascension right-hand rod-reading Rodman set of marking-pins sextant side sidereal sight simple curve sketch slope-stake solar Spherical Aberration stadia Stakeman stakes star steel tape striding-level tacks taken tangent temperature tested theodolite tion transitman triangulation stations triangulation system tripod tube vernier vertical axis vertical circle wire zero
Popular passages
Page 121 - The adjustment of the Y level consists of the following: I. To bring the axis of the bubble into the same plane as the axis of the telescope so that the bubble will remain in the center even though the telescope is turned slightly in the Y's II. To make the line of collimation parallel to the axis of the bubble, in order that the line of collimation may be horizontal when the bubble is in the center. III. To make the axis of the bubble perpendicular to the vertical axis of the instrument, in order...
Page 120 - See parallax adjustment for transit, p. 347. 2. Telescope Level Vial. To make the axis of the bubble perpendicular to the vertical axis or spindle. (a) Set up level on tripod, rotate about spindle until telescope is over two diagonally opposite leveling screws, and bring bubble to center of tube. (6) Rotate level about spindle 180°, and note whether bubble remains in center of tube. (c) If not, bring the bubble halfway back to the...
Page 6 - After bringing the head of the tripod as nearly level as possible by changing the tripod legs, place the bubble parallel to an opposite pair of leveling screws and bring the bubble to the center, remembering that both thumbs turn out or both in, and that the bubble will go in the direction in which the left thumb moves. When the bubble is in the center, turn through 90 degrees and level over the other set in a similar manner. Care should be taken that the leveling screws do not bind, but they should...
Page 22 - To make the Vernier of the Vertical Circle read Zero when the Line of Sight is Horizontal. — Having made the axis of the telescope-bubble parallel to the line of sight...
Page 30 - ... field, similar to the report on level and transit adjustments. PROBLEM F3. USE OF THE SEXTANT Equipment. Sextant (and several range poles if so directed by the instructor). Problem. To measure the angles between permanent objects or to close the horizon, using range poles with varicolored flags as sights. Theory. The principle upon which the sextant is constructed is that if a ray of light is reflected successively between two plane mirrors, the angle between the incident and reflected rays is...