 | British Association for the Advancement of Science - 1839 - 630 pages
...experience, therefore, leads to the conclusion, that no levelling can be expected to give a correct result, unless it be performed in opposite directions, and the mean of both results be taken ; instead of depending, as Captain Lloyd appears to have done, on the consistency of separate sets... | |
 | Abraham Crocker - 1841 - 486 pages
...experience, therefore, leads to the conclusion, that no levelling can be expected to give a correct result, unless it be performed in opposite directions, and the mean of both results be taken, instead of depending, as Captain Lloyd appears to have done*, on the consistency of separate sets of... | |
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... returning upon any part of it ; it being much more probable that errors depending on the state of the atmosphere will balance each other in the former than in the latter case. My own experience, therefore, leads to the conclusion, that no levelling... 