A Treatise on the Principles and Practice of Levelling: Showing Its Application to Purposes of Railway Engineering and the Construction of Roads, &cVan Nostrand, 1870 - 157 páginas |
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Página 14
... surveyor , requiring the utmost possible circumspection to avoid the numerous sources of error to which he is liable . More especially , as it is seldom possible for him , after levelling over a long tract of country , to conjecture in ...
... surveyor , requiring the utmost possible circumspection to avoid the numerous sources of error to which he is liable . More especially , as it is seldom possible for him , after levelling over a long tract of country , to conjecture in ...
Página 16
... surveyor should possess instruments most proper for the purpose , and of the best construction . Upon the subject of ... surveying and astronomy , and has had an ex- tensive sale , we presume it to be in the hands of most beginners in ...
... surveyor should possess instruments most proper for the purpose , and of the best construction . Upon the subject of ... surveying and astronomy , and has had an ex- tensive sale , we presume it to be in the hands of most beginners in ...
Página 23
... surveyor . This has invariably arisen from ignorance of the principles of the telescope , and hence , not knowing how the parallax arises , the means of removing it have not been understood ; we shall endeavor to explain , in a popular ...
... surveyor . This has invariably arisen from ignorance of the principles of the telescope , and hence , not knowing how the parallax arises , the means of removing it have not been understood ; we shall endeavor to explain , in a popular ...
Página 35
... surveyor would most likely have been ordered off , a great feel- ing of opposition existing among the owners and occu- piers of the said lands ; and further , the public road crossed the line several times , by which a number of ...
... surveyor would most likely have been ordered off , a great feel- ing of opposition existing among the owners and occu- piers of the said lands ; and further , the public road crossed the line several times , by which a number of ...
Página 36
... surveyor must next set up his spirit - level in the most suitable spot which presents itself , from whence he can have an unin- terrupted view , not only of the staff at the back station , but also for a considerable distance in the ...
... surveyor must next set up his spirit - level in the most suitable spot which presents itself , from whence he can have an unin- terrupted view , not only of the staff at the back station , but also for a considerable distance in the ...
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Términos y frases comunes
a₁ adjustment application approximate point b₁ back sight back staff bench mark Bridge calculations centre line centre stake chain Civil Engineer clinometer Cloth column 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 Drawing Dumpy Level earth edition engravings equal example feet Folkstone foot fore sight formula forward reading forward station give ground Guns Gunter's chain horizontal line hypothenuse Hypsometry Illustrated inches inclination inclined plane instrument Iron J. P. WHITNEY John Macneill length line A B lines of railway mean height measured method middle area miles object glass observation obtain parallax perpendicular placed quantity radius reduced levels represent result road side slope spirit-level Steam stones STRENGTH OF MATERIALS subtracted superelevation Survey surveyor Tables tangent telescope theodolite tion U. S. Navy Water wood-cuts
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