## Course of Civil Engineering: Comprising Plane Trigonometry, Surveying, and Levelling. With Their Application to the Construction of Common Roads, Railways, Canals ...S.J. Machen, 1842 |

### From inside the book

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Page x

... segment of the earth 246 Calculation of triangles 254 To measure an are of the

... segment of the earth 246 Calculation of triangles 254 To measure an are of the

**meridian**259 Calculation of triangles 261 Observations on Triangulation 267 Page . Helliostat and reflectors — Drummond light - Col X CONTENTS . Page xi

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**meridian**285 SUBTERRANEAN SURVEYING 288 To find the variation of the compass 290 To find the scale to which a map was laid down 292 To cut off any required number of acres from a survey 292 To divide a farm or estate into two parts ... Page 249

... their trigo- nometrical operations from Dunkirk to Paris , under the direction of Cassini , and the result of the conjoined operations of both nations shews that the

... their trigo- nometrical operations from Dunkirk to Paris , under the direction of Cassini , and the result of the conjoined operations of both nations shews that the

**meridian**passing through TRIGONOMETRICAL SURVEYING . 249. Page 250

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**meridian**passing through the observatory at Paris lies 2 ° 19 ′ 51 ′′ east from that passing through the observatory of Greenwich . With a view to correct the maps and charts of the country and coast , which from their incorrectness had ... Page 251

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**meridian**, at a point equally distant from the pole and equator , was determined on as a permanent basis . " But to secure greater accuracy in determining the standard , it had been decided to prolong the observa- tions on both sides of ...### Other editions - View all

Course of Civil Engineering: Comprising Plane Trigonometry, Surveying, and ... John Gregory No preview available - 2015 |

Course of Civil Engineering: Comprising Plane Trigonometry, Surveying, and ... John Gregory No preview available - 2018 |

### Common terms and phrases

acres angles of elevation ascertain base line bisect boundary calculation centre chain chord circumferentor compasses cosecant Cosine Sine Cotang Cotang Sine Cosine deducted degrees diameter difference direction distance divided divisions equal error extend feet field-book figure ground height Hence horizontal instrument length line of numbers line of sines line of tangents logarithmic mark measure the angles meridian method minutes multiplied N.cos N.sin N.cos natural number natural sine needle number answering object offsets parallel ruler parish perches perpendicular plane triangle plotted Prop protractor quotient radius right angles right-angled triangle roods scale secant sextant side AC Sine Cosine Tang Sine Cotang Tang spherical angles spherical excess spherical triangle station line surveyor taken theodolite three angles Tithe Commissioners took the angle Torfou Townlands trapezium triangle ABC trigonometrical survey versed sine vertical yards

### Popular passages

Page ix - into 360 equal parts, called degrees ; each degree being divided into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds, &c.

Page 38 - the angle opposite to that other given side is always acute. But when the given side opposite to the given angle, is less than the other given side, then the angle opposite that other given side may be either acute or obtuse, and

Page 147 - The number of changes shows how many times ten chains the line contains, to which the follower adds the arrows he holds in his hand, and the number of links of another chain over to the mark or end of the line.

Page 40 - sum of the other two, as their difference is to the difference of the segments of the base, made by a perpendicular

Page 81 - Suppose that in carrying on an extensive survey, the distance between two spires, A and B, has been found equal to 6594 yards, and that C and D are two eminences conveniently situated for extending the triangles, but not admitting of the determination of their distance by actual admeasurement ; to ascertain it, therefore,

Page 206 - materially from the arcs which they subtend. Let the three angles of the spherical triangle be represented by A, B, C ; and their opposite sides by a, b, c ; and let a', b', c', represent the chords of these sides, which chords are supposed not to differ

Page 40 - of half the perimeter above those sides, as the square of the radius is to the square of the sine of half the angle included by

Page 70 - of the bottom of the object, equal 27°, and of its top 19°. Required the height of the object, and the distance of the mark from its bottom. Here,

Page 5 - 0, 10, 20, 30, &c. ; each of these large divisions represents 10 degrees of the equator, or 600 miles. The first of these divisions is sometimes divided into 40 equal parts, each representing 15 miles. The

Page 148 - with the cross, by fixing it by trials on such parts of the line as that through one pair of the sights both ends of the line may appear, and through the other pair you