Land and marine surveying1868 - 184 pages |
From inside the book
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Page 48
... perfect accuracy ; we only consider that it takes up more time and gives much more trouble than when the proper instruments are used . We give an estate survey at fig . 17 , made with the chain only . It is always an advantage in such a ...
... perfect accuracy ; we only consider that it takes up more time and gives much more trouble than when the proper instruments are used . We give an estate survey at fig . 17 , made with the chain only . It is always an advantage in such a ...
Page 68
... perfect , move the index by the milled head , and then read off on the limb how much the broad arrow has deviated from the zero . By means of the key , K , this error should be corrected by applying it to the key - hole and turning it ...
... perfect , move the index by the milled head , and then read off on the limb how much the broad arrow has deviated from the zero . By means of the key , K , this error should be corrected by applying it to the key - hole and turning it ...
Page 69
... perfect orb ; if they do not , the above adjustments should be further examined , as whilst we are doing this work , it may as well be made perfect once for all . We do not , however , advise this trial being made , before the observer ...
... perfect orb ; if they do not , the above adjustments should be further examined , as whilst we are doing this work , it may as well be made perfect once for all . We do not , however , advise this trial being made , before the observer ...
Page 77
... perfect the contact , when an observation is made . One side of the vertical arc is inlaid with silver , and divided into single minutes by means of its vernier . The other side shows the difference between the hypothenum and base of a ...
... perfect the contact , when an observation is made . One side of the vertical arc is inlaid with silver , and divided into single minutes by means of its vernier . The other side shows the difference between the hypothenum and base of a ...
Page 79
... perfect in both positions of the telescope , the line of collimation in altitude or depression is correct , but if not , the operations must be repeated carefully , until the adjustment is satisfac- tory . A similar proceeding will also ...
... perfect in both positions of the telescope , the line of collimation in altitude or depression is correct , but if not , the operations must be repeated carefully , until the adjustment is satisfac- tory . A similar proceeding will also ...
Other editions - View all
Common terms and phrases
adjustment arrow ascertain base line beam compasses box sextant broad arrow centre chain line chainage chainman Chap clamp cloth co-efficients coincide compass correct cosine coversine depth difference distance divisions draw edge engineering equal error exactly feet long fence field book fixed gamboge gauge give Gunter's chain half high water horizon glass inches instance instrument intersection leader length loosen lunitidal intervals manner mark means measure ment minutes notch object observations obtained offset staff Outfall Sewer overfall Oyster Rock paper parallel parallel ruler pencil plot pole practice prick protractor quantity Railway rain gauge rainfall reading referred right angles road scale side sight sine square station straight line straight-edge streams suppose survey surveyor Tables taken telescope theodolite tie line timber tion tracing traverse triangle TRIGONOMETRY turn vernier plate vertical W. D. Hamilton woodcuts zero
Popular passages
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