## A TREATISE ON THE PRINCIPLES AND PRACTICE OF LEVELLING |

### From inside the book

Results 1-5 of 33

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**determined**by simple reference to a horizontal line , since every point on the surface of the globe ( however near to each other ) has a distinct horizon of its own . If the earth were everywhere surrounded by a fluid at rest , or that ... Page 15

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**determined**from the section ; that is , whether the inclinations , which the undulations of the ground admit of being introduced , are suitable for the purpose either of a railway or turnpike road . And if the ob- ject be the formation ... Page 20

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**determined**in one direction , and the observer himself can detect if it be held aslant in the other direction , as may be under- stood from the diagram at page 26 , which represents the staff e as it appears in the field of the ... Page 22

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**determination**; which is the same thing as acertaining the whole difference of level between distant places . Neither are any measure- ments required to produce a section if you possess a correct map or plan of the district or line ... Page 23

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**determine**the general features of the country sufficiently for the engineer to choose the best route for a minute and detailed survey , which would cost too much time and money to undertake in the first instance where there exists any ...### Other editions - View all

### Common terms and phrases

50 base adjustment approximate point b₁ b₂ back sight back staff bench mark calculations centre line centre stake chain clinometer Cloth computed half width construction correct cross wires curvature curve cuttings and embankments datum line depth of cutting determined diagram difference of level direction distance Dover Castle Dumpy Level earth edition engraving equal example field-book Folkstone Foot of bank Fore Sight forward reading forward station give gradient ground Gunter's chain horizontal line hypothenuse Hypsometry Illustrated inches inclined plane instrument J. P. WHITNEY length line A B lines of railway mean height measured Merrimack River method middle area mile object glass observer obtain outer rail parallax perpendicular placed plates point a₁ point H practice radius ratio Reduced Levels refraction represent right angles slope spirit-level stones subtracted superelevation surveyor Tables tangent telescope theodolite tion Top of bank Treatise turnpike road yards

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