Sextant With Attached Spirit Level Horizon
Sextant With Attached Spirit Level Horizon
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To quickly assess the difficulty of the text, read a short excerpt:
The level had a radius of curvature of fifty-six inches, but for sea observations it may be smaller for bad weather and until practice be acquired.
The following results from observations for latitude are given as exhibiting what was done at the second and third trials with the in- strument. It is believed that, with practice and a level adapted for the duty, much better results can be obtained, especially in the hands of a more experienced observer with the sextant.
Latitude from circummeridia...n altitudes of the sun with sextant and spirit-level horizon. Observations of November llth commenced 5 min. 48 sec. Before apparent noon, and ended 11 min. 18 sec. After noon. November 12th commenced 7 min. 23 sec. Before, and ended 5 min. 55 sec. After apparent noon.
NOVEMBER 11, 1865.
NOVEMBER 12, 1865.
v J-L "0" . A.
39 59' 18" 55' 55" 57' 05" 56' 52" 67' 55" 55' 52" 58' 41" 39 57' 14" 57' 36" 57' 18" 58' 41" 59' 43" 61' 27" 39 60' 12" 59' 28" 57' 61" 57' 39" 66' 01" 56' 59" 58' 54" 39 54' 19" 66' 37" 66' 31" 58' 13" 57' 51" 58' 29" 59' 01" Means, 39 57' 23" 39 58' 38" 39 58' 09" 39 57' 17" These reductions have been unnecessarily made to seconds of arc that the actual working of the instrument may be seen ; the probable error of one observation deduced from these series is one minute of arc, and the probable error of the mean of all the observations is thir- ty-five seconds of arc.
What to read after Sextant With Attached Spirit Level Horizon?
You can find similar books in the "Read Also" column, or choose other free books by Davidson George to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The level had a radius of curvature of fifty-six inches, but for sea observations it may be smaller for bad weather and until practice be acquired.
The following results from observations for latitude are given as exhibiting what was done at the second and third trials with the in- strument. It is believed that, with practice and a level adapted for the duty, much better results can be obtained, especially in the hands of a more experienced observer with the sextant.
Latitude from circummeridia...n altitudes of the sun with sextant and spirit-level horizon. Observations of November llth commenced 5 min. 48 sec. Before apparent noon, and ended 11 min. 18 sec. After noon. November 12th commenced 7 min. 23 sec. Before, and ended 5 min. 55 sec. After apparent noon.
NOVEMBER 11, 1865.
NOVEMBER 12, 1865.
v J-L "0" . A.
39 59' 18" 55' 55" 57' 05" 56' 52" 67' 55" 55' 52" 58' 41" 39 57' 14" 57' 36" 57' 18" 58' 41" 59' 43" 61' 27" 39 60' 12" 59' 28" 57' 61" 57' 39" 66' 01" 56' 59" 58' 54" 39 54' 19" 66' 37" 66' 31" 58' 13" 57' 51" 58' 29" 59' 01" Means, 39 57' 23" 39 58' 38" 39 58' 09" 39 57' 17" These reductions have been unnecessarily made to seconds of arc that the actual working of the instrument may be seen ; the probable error of one observation deduced from these series is one minute of arc, and the probable error of the mean of all the observations is thir- ty-five seconds of arc.
What to read after Sextant With Attached Spirit Level Horizon?
You can find similar books in the "Read Also" column, or choose other free books by Davidson George to read onlineMoreLess
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