 | Frederick Walter Simms - 1844 - 178 pages
...; but it must be insisted on, that the telescope should, on everj' occasion, be raised or lowered, by its proper screw, for making them perfectly so....than distances taken in a vertical plane. Meridian altithe same day, because there is not time : all therefore that can be done, is, to observe the altitude... | |
 | John Fry Heather - 1849 - 202 pages
...brightness; but it must be insisted on, that the telescope should, on every occasion, be raised or lowered, by its proper screw, for making them perfectly so."...done is, to observe the altitude one way, and use the index error ; but, even here, you have a mean of that altitude, and this error taken on three different... | |
 | Frederick Walter Simms - 1850 - 184 pages
...; but it must be insisted on, that the telescopes should, on every occasion, be raised or lowered, by its proper screw. for making them perfectly so....because there is not time : all therefore that can he done is, to observe the altitude one way, and use the index error ; but even here you have a mean... | |
 | Sir Henry Edward Landor Thuillier - 1851 - 826 pages
...brightness ; but it must be insisted on, that the telescope should, on every occasion, be raised or lowered, by its proper screw, for making them perfectly so....done, is, to observe the altitude one way, and use the index error ; but even here, you have a mean of that altitude, and this error, taken on three different... | |
 | John Fry Heather - 1859 - 198 pages
...brightness ; but it must be insisted on, that the telescope should, on every occasion, be raised or lowered, by its proper screw, for making them perfectly so."...done is, to observe the altitude one way, and use the index error ; but, even here, you have a mean of that altitude, and this error taken on three different... | |
 | 1860 - 936 pages
...brightness ; but it most be insisted on, that the telescope should, on every occasion, be raised or lowered, by its proper screw, for making them perfectly so."...done is, to observe the altitude one way, and use the index error ; but, even here, you have a mean of that altitude, and this error taken on three different... | |
 | John Fry Heather - 1866 - 228 pages
...brightness ; but it must be insisted on, that the telescope should, on every occasion, be raised or lowered, by its proper screw, for making them perfectly so."...done is, to observe the altitude one way, and use the index error ; but, even here, you have a mean of that altitude, and this error taken on three different... | |
 | Great Britain. Army. Royal Engineers - 1890 - 374 pages
...for taking altitudes by the sea or any artificial horizon, these altitudes being recorded as angles in a vertical plane. Meridian altitudes cannot, however, be taken both backwards and forwards in the same day, because there is not time at noon. All that can, therefore, be done is to observe... | |
 | 1835 - 596 pages
...brightness; but it must be insisted on that the telescope should on every occasion be raised or lowered by its proper screw for making them perfectly so....forwards the same day, because there is not time : all that can be done, therefore, is to observe the altitude one way, and use the index error ; but even... | |
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The foregoing instructions for taking distances apply equally for taking altitudes by the sea or artificial horizon, they being no more than distances taken in a vertical plane. Meridian altitudes cannot, however, be taken both backwards and forwards... 