This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 edition. Excerpt: ...procedure is the same as that given in Problem D2, except that the distances are obtained by the stadia, instead of by tape or chain. At the first station, place the line of sight on magnetic south, as in Problem D2. Unclamp the upper motion, and turn to station 2, reading the azimuth, bearing, rod ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 edition. Excerpt: ...procedure is the same as that given in Problem D2, except that the distances are obtained by the stadia, instead of by tape or chain. At the first station, place the line of sight on magnetic south, as in Problem D2. Unclamp the upper motion, and turn to station 2, reading the azimuth, bearing, rod reading, and vertical angle. Take the same information on. the last station. In obtaining the rod reading, the upper or lower wire is placed on an even foot mark on the rod, and the space between the two wires is noted. Attention is called to the fact that the wire may be moved over some vertical distance, regardless of the position of the bubble. In finding the vertical angle, however, the height of the crosswires above the ground is found, and the middle wire is sighted at this height when sighting at the adjacent stations. The method of procedure at the second station is as follows: Lay off the backward azimuth on the plate, and sight at the first station, using the lower motion. The rod reading, vertical angle and bearing are taken; the upper motion is then undamped and the information on the forward station is obtained, i The backward and forward rod readings should check within 0.02 of a foot at the most, and the vertical angles should check within two minutes. If either or both do not check within this limit, investigate as follows: See that the transit is level; that the height of the cross-wires was measured correctly; that a sight was taken at a proper height on the rod; and finally, re-measure the rod readings and the vertical angle. If these measurements agree with those first taken at this station, an asterisk or check mark should be placed near them in the notes, and the forward readings should be rejected in computation. It is...
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