 | Thomas Kerigan - 1828 - 776 pages
...the difference of that time to 12 hours (both expressed in hours and decimal parts of an hour) : the sum, rejecting 10 from the index, will be the log. of the equation of second difference in seconds of a degree. Example. . \' Let the mean second difference... | |
 | Thomas Kerigan - 1838 - 804 pages
...constant log. 0.945124, (the log. of the sun's mean horizontal parallax estimated at 8*. 813,) and the sum, rejecting 10 from the index, will be the log. of the parallax in altitude; as thus, Given the sun's apparent altitude 20 degrees ; required the corresponding... | |
 | Scottish school-book assoc - 1845 - 444 pages
...angle; to the log. secant of this angle add the log. of the distance of the perpendiculars, and the sum, rejecting 10, from the, index, will be the log. of the distance sought. 96. If the distance between the objects A and B he given, to find the distance between... | |
 | Basil Jackson - 1847 - 410 pages
...logarithm of the measured distance and the log-tangent of the observed angle ; the sum, rejecting ten from the index, will be the log. of the difference of level in feet, or as the distance was measured in. In this manner, by considering the surface of every principal undulation... | |
 | Literary and Historical Society of Quebec - 1855 - 574 pages
...and the log. cosine of the half difference of the ares of A and B, and the constant log., 0.30103, and their sum, rejecting 10 from the Index, will be the log. cosine of the true distance. VII. Substitute, for the log. cosine of the moon's true altitude and the... | |
 | Frederick Walter Simms - 1856 - 258 pages
...Add together the logarithm of the measured distance, and the log. tangent of the observed angle; the sum, rejecting 10 from the index, will be the log. of the difference of level, in feet or links, fyc., as the distance was measured in. If the distance be measured with Gunter's chain, the result... | |
 | Henry S. Merrett - 1863 - 476 pages
...level is calculated, thus : Add to the logarithm of the measured distance, the logarithmic tangent of the vertical angle, and their sum, rejecting 10 from the index, will be the logarithm of the difference of level, in feet and decimals (provided the lengths are measured in feet)... | |
 | Henry S. Merrett - 1863 - 428 pages
...level is calculated, thus : Add to the logarithm of the measured distance, the logarithmic tangent of the vertical angle, and their sum, rejecting 10 from the index, will be the logarithm of the difference of level, in feet and decimals (provided the lengths are measured in feet)... | |
 | George Frederick Chambers - 1867 - 888 pages
...star in passing from any wire to the centre wire add the log. cosine of the star's declination : the sum, rejecting 10 from the index, will be the log. of the equatorial intervals. Having determined the intervals for all the wires several times over by stars... | |
 | FREDERICK W. SIMMS - 1870 - 174 pages
...so.f Add together the logarithm of the measured distance, and the log. sine of the observed angle; the sum, rejecting 10 from the index, will be the log. of the difference of level, in feet or links, efec., the same as the distance was measured in. If the distance be measured with Gunter s chain, the... | |
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... triangle, of which the perpendicular is the difference of level. It scarcely appears necessary to give the rule for the calculation, but for the sake of uniformity we shall do so.f Add together the logarithm of the measured distance, and the log.... 
