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 |
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Page 80
... two forts , which were separated from me by a large river , I mea- sured a convenient base AB of 300 yards . Now from H M A B the extremities of the base line AB , I took the following 0 ' , and HBM = 45 ° 15 ′ 80 ELEMENTS OF.
... two forts , which were separated from me by a large river , I mea- sured a convenient base AB of 300 yards . Now from H M A B the extremities of the base line AB , I took the following 0 ' , and HBM = 45 ° 15 ′ 80 ELEMENTS OF.
Page 168
... base line within the figure , in such a direction as that all the perpendiculars drawn to it , from the corner of the piece , may fall within the figure . This instrument is very useful to measure small pieces of ground , with crooked ...
... base line within the figure , in such a direction as that all the perpendiculars drawn to it , from the corner of the piece , may fall within the figure . This instrument is very useful to measure small pieces of ground , with crooked ...
Page 181
... base line from one extremity , as nearly as you can guess , in that direction , placing marks or false stations , as they are called , at the end of every five or ten chains , and taking special care to make the necessary correction in ...
... base line from one extremity , as nearly as you can guess , in that direction , placing marks or false stations , as they are called , at the end of every five or ten chains , and taking special care to make the necessary correction in ...
Page 183
... base line , construct triangles on it to the right and to the left , taking care to have them as nearly equilateral as the nature of the ground will admit . On the sides remote from the base line , construct other triangles , measuring ...
... base line , construct triangles on it to the right and to the left , taking care to have them as nearly equilateral as the nature of the ground will admit . On the sides remote from the base line , construct other triangles , measuring ...
Page 185
... base line , one surveying the part of the parish or estate on one side of the line , while the second person con- fines himself to the part on the other side . By this division the survey will be more expeditiously and correctly done ...
... base line , one surveying the part of the parish or estate on one side of the line , while the second person con- fines himself to the part on the other side . By this division the survey will be more expeditiously and correctly done ...
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