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

### From inside the book

Results 1-5 of 14

Page 95

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**ratio**of the slope to the perpendicular , as one to one , & c . , be readily deduced . As this very useful portable instrument is not generally known , we shall ON LEVELLING . 95 EXAMPLE OF COMPUTATION OF EARTH-WORK SIR JOHN MACNEILL'S ... Page 96

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**ratio**of the slopes , one to one , & c . An index bar , E , turns upon the centre of the quadrant , and carries a spirit - level by which the index may be set truly horizontal by the hand ; and whatever angle is there denoted on the ... Page 97

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**ratio**of the slope to the perpen- dicular is represented by the natural co - tangent of the angle thus measured ; but as the observer may not have at hand a Table of natural co - tangents , & c . , we have annexed a Table at once ... Page 98

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**Ratio**of Slope to perpendi- cular . Angle of slope . With With vertical . horizon . Slope or Batter to 1 foot perpen- dicular .**Ratio**of Slope to perpendi- cular . Angle of Slope . With vertical . horizon . With ft . in . 0 о ft . in ... Page 119

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**ratio**of the inclination , or batter , of the slopes to the heights , both in the cuttings and the embankments , to be 2 to 1 ; beyond which , or at the outward edge , a slip of land 12 feet wide is to be taken on each side of the ...### 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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