This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 Excerpt: ...adjustable, and the arc may be either full 360 degrees or only 180 degrees. It is necessary that the zeros of the vernier and scale coincide when the line of sight is horizontal, and this is accomplished as follows: after adjusting the telescope or long bubble, level up carefully and bring the telescope bubble to the ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 Excerpt: ...adjustable, and the arc may be either full 360 degrees or only 180 degrees. It is necessary that the zeros of the vernier and scale coincide when the line of sight is horizontal, and this is accomplished as follows: after adjusting the telescope or long bubble, level up carefully and bring the telescope bubble to the middle of the tube. The line of sight is now horizontal. Loosen the two screws which hold the vernier, shift the vernier so that it reads zero, and tighten the screws fixing the vernier in place. Distinction between Theodolite and Tachymeter. The complete engineer's transit, sometimes called a tachymeter, should not be confused with the theodolite which is used mainly in the measurement of angles for triangulation in geodetic surveying. The theodolite does not transit--revolve in a vertical plane--the telescope being too long and such a motion being unnecessary. Also, it is constructed on a different principle from that of the transit, in as much as no vernier is used on the plates, but the reading of the angle is made by means of micrometer screws. By this device it is possible to read to single seconds of arc and to estimate to lOths of seconds. This is far closer than it is possible to point the instrument. Hence, instead of the repetition method used with the transit, the direction method is used, that is, a large number of sights are taken on each point, and the average of the scale readings is used. The angle is found by subtracting the scale readings, the scale being fixed in position and not movable like a transit scale. Transit verniers and scales are made reading to 20 seconds or even to 10 seconds. These are used in city surveying and accurate work, the usual instruments reading only to 1 minute or to 30 seconds. TRAVERSINO WITH TRAN...
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Add this copy of Plane Surveying; a Practical Treatise to cart. $19.95, very good condition, Sold by Artis Books rated 4.0 out of 5 stars, ships from Calumet, MI, UNITED STATES, published 1926 by American Technical Society.
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Add this copy of Plane Surveying: A Practical Treatise on the Art of to cart. $42.59, new condition, Sold by Ria Christie Books rated 5.0 out of 5 stars, ships from Uxbridge, MIDDLESEX, UNITED KINGDOM, published 2022 by Legare Street Press.
