A TREATISE ON THE PRINCIPLES AND PRACTICE OF LEVELLING |
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Page 32
... depth of the pond 10 feet ; there- fore the difference of level between the bottom of the pond and the surface of the stream was as follows : Reading of the staff .. ft . dec . 17.44 Height of instrument ... 4.00 Depth of pond ...
... depth of the pond 10 feet ; there- fore the difference of level between the bottom of the pond and the surface of the stream was as follows : Reading of the staff .. ft . dec . 17.44 Height of instrument ... 4.00 Depth of pond ...
Page 52
... depth of the second forward station below the datum line , and therefore is marked ( minus ) ; the next is likewise a fall of 7.84 , and as our last result was below the datum line , this additional negative quantity will take us still ...
... depth of the second forward station below the datum line , and therefore is marked ( minus ) ; the next is likewise a fall of 7.84 , and as our last result was below the datum line , this additional negative quantity will take us still ...
Page 53
... depth of the fourth forward station below the datum . The ground then rises again , and we have an ascent of 13.67 feet , which will bring us nearer to our datum ; and as it diminishes our depth below the datum line it must be ...
... depth of the fourth forward station below the datum . The ground then rises again , and we have an ascent of 13.67 feet , which will bring us nearer to our datum ; and as it diminishes our depth below the datum line it must be ...
Page 57
... depths of cutting and embankment required in the execution of road , railway , or canal works , with greater clearness than if both scales were equal . The plans and sections of projected works deposited with the Clerks of the Peace of ...
... depths of cutting and embankment required in the execution of road , railway , or canal works , with greater clearness than if both scales were equal . The plans and sections of projected works deposited with the Clerks of the Peace of ...
Page 68
... depth of the cutting from the surface to formation level at the same point , or the height of the embankment , as the case may be ; these heights and depths are those from which the calculations of the quantities are to be made , and ...
... depth of the cutting from the surface to formation level at the same point , or the height of the embankment , as the case may be ; these heights and depths are those from which the calculations of the quantities are to be made , and ...
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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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