 | 1857 - 578 σελίδες
...the same effect on the survey as if it had been made in taking a horizontal draft of 20 fathoms long, and on which an error of 4° would throw the end of...nearly 9 feet too far either to the right or left. and the dial in the level, are two objects forming a right angle with his cross-staff. He then requests... | |
 | John Budge - 1860 - 214 σελίδες
...the same effect on the survey as if it had been made in taking a horizontal draft of 20 fathoms long, and on which an error of 4° would throw the end of...instrument, he may accomplish it in the following manner:—Let him fix a cross-staff in such a position that, through one pair of sights, he can see... | |
 | Samuel Harries Daddow, Benjamin Bannan - 1866 - 820 σελίδες
...would throw the end of the line nearly 9 feet too far either to the right or left. Should a surveyor be called to do a job of this kind, in the absence...through one pair of sights he can see the candle in the slope, and hi the line of the other pair he has the compass fixed in the level, out of the way of the... | |
 | Samuel Harries Daddow, Benjamin Bannan - 1866 - 826 σελίδες
...the same effect on the survey as if it had been made in taking a horizontal draft of 120 feet long, and on which an error of 4° would throw the end of the line nearly 9 feet too fur either to the right or left. Should a surveyor be called to do a job of this kind, in the absence... | |
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... and on which an error of 4° would throw the end of the line nearly 9 feet too far either to the right or left. Should a dialler be called to do a job of this kind in the absence of a suitable instrument, he may accomplish it in the following manner... 