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

### From inside the book

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**spirit level**) , might be set up anywhere on the surface , as at I , and staves being placed or held along the line , as at a , b , c , d , & c . , the different heights above the ground where such staves were intersected by the line so ... Page 7

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**spirit**-**levels**; it is parallel to a tan- gent to the earth's surface at that point only where the instrument is set up , -thus A B is a tangent at I , and DE a tangent at F ; such being the fact , the difference of level between any ... Page 16

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**SPIRIT LEVELS**. The Y level , so called from the supports in which the telescope rests , resembling in shape the letter Y , is the * Also a work published by Mr. Weale , on Drawing Instruments , with Instructions for Field Work , in ... Page 17

FREDERICK W. SIMMS. oldest construction of the

FREDERICK W. SIMMS. oldest construction of the

**spirit**-**level**now in use ; its adjustments are convenient to be performed , but , on the other hand , this kind of instrument seldom retains its adjustments perfect for any length of time ... Page 21

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**spirit**-**level**; it is at present not generally used , but we consider it of more importance than is usually attached to it . It consists of a trian- gular piece of sheet iron , of about one - tenth of an inch in thickness , having 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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