A Textbook On Surveying And Mapping ... 1
A Textbook On Surveying And Mapping ... 1
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The grade line having been decided upon, it is drawn in red ink.
Example. — The elevation of Station 20 is 140.0 feet; between Sta- tions 20 and 100 there is an ascending grade of .75 per cent. : what is the elevation of the grade at Station 71 ?
Solution. — To obtain the elevation of the grade at Station 71, we add to the elevation of the grade at Station 20, 140 feet, the total rise in grade between Stations 20 and 71. Accordingly, 71 — 20 = 51 ; .75 foot X 51 = 38.25 feet; 140 + 38.25 = 178....25 feet, the elevation of grade at Station 71.
SURVEYING.
255 TOPOGRAPHICAL SURVEYING.
1292. General Definition. — Topographical sur- veying is the location and representation of the inequalities of any portion of the earth's surface. The portion surveyed is conceived to be projected upon a horizontal plane, called a plane of reference, upon which all inequalities of sur- face as well as all conspicuous objects are shown in their true relative positions. The simplest and most generally used method of representing the.
What to read after A Textbook On Surveying And Mapping ... 1?
You can find similar books in the "Read Also" column, or choose other free books by International Correspondence Schools to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The grade line having been decided upon, it is drawn in red ink.
Example. — The elevation of Station 20 is 140.0 feet; between Sta- tions 20 and 100 there is an ascending grade of .75 per cent. : what is the elevation of the grade at Station 71 ?
Solution. — To obtain the elevation of the grade at Station 71, we add to the elevation of the grade at Station 20, 140 feet, the total rise in grade between Stations 20 and 71. Accordingly, 71 — 20 = 51 ; .75 foot X 51 = 38.25 feet; 140 + 38.25 = 178....25 feet, the elevation of grade at Station 71.
SURVEYING.
255 TOPOGRAPHICAL SURVEYING.
1292. General Definition. — Topographical sur- veying is the location and representation of the inequalities of any portion of the earth's surface. The portion surveyed is conceived to be projected upon a horizontal plane, called a plane of reference, upon which all inequalities of sur- face as well as all conspicuous objects are shown in their true relative positions. The simplest and most generally used method of representing the.
What to read after A Textbook On Surveying And Mapping ... 1?
You can find similar books in the "Read Also" column, or choose other free books by International Correspondence Schools to read onlineMoreLess
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