The New American Practical Navigator; Being an Epitome of Navigation; Containing All the Tables Necessary to be Used with the Nauticl AlmanacE. & G.W. Blunt, 1846 - 451 pages |
From inside the book
Results 1-5 of 55
Page viii
... central mirror , those surfaces being supposed to be perpendicular to the plane of the instrument . The correction in the fifth column of this table corresponding to any angle A in the first column , may be found nearly by Hutton's ...
... central mirror , those surfaces being supposed to be perpendicular to the plane of the instrument . The correction in the fifth column of this table corresponding to any angle A in the first column , may be found nearly by Hutton's ...
Page xiv
... central mirror ..... XXXIV . Errors arising from a deviation of one minute in the parallelism of the 244 ...... XXXV . Errors arising from a deviation of the telescope from a plane parallel to the plane of the instrument 244 XXXVI ...
... central mirror ..... XXXIV . Errors arising from a deviation of one minute in the parallelism of the 244 ...... XXXV . Errors arising from a deviation of the telescope from a plane parallel to the plane of the instrument 244 XXXVI ...
Page 133
... the altitude f the sun's upper limb . The corrections to be applied to obtain the true central altitude , will be given mereafter . the eye - glass being fixed in a movable tube 133 Description and use of a sextant of reflection.
... the altitude f the sun's upper limb . The corrections to be applied to obtain the true central altitude , will be given mereafter . the eye - glass being fixed in a movable tube 133 Description and use of a sextant of reflection.
Page 136
... central mirror , and turning it , so that the edge which was formerly uppermost may now be nearest the plane of the instrument ; rectify its position , and again measure the distance of the two objects ; half the differ- ence between ...
... central mirror , and turning it , so that the edge which was formerly uppermost may now be nearest the plane of the instrument ; rectify its position , and again measure the distance of the two objects ; half the differ- ence between ...
Page 137
... central index EF ; the horizon index MD ; the central glass or mirror A ; the horizon glass or mirror B ; the telescope GH ; the colored glasses , figures 3 , 4 ; the handle , figure 5 ; the ventelle , figure 6 ; and the adjusting tool ...
... central index EF ; the horizon index MD ; the central glass or mirror A ; the horizon glass or mirror B ; the telescope GH ; the colored glasses , figures 3 , 4 ; the handle , figure 5 ; the ventelle , figure 6 ; and the adjusting tool ...
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The New American Practical Navigator; Being an Epitome of Navigation ... Nathaniel Bowditch No preview available - 2015 |
Common terms and phrases
anchor apparent altitude azimuth bearing cable calculation central index centre chord chronometer circle column compass Corr correct central altitude corresponding Cosec cosine degrees diameter diff difference of latitude difference of longitude Dist divided draw elapsed equal equator error EXAMPLE feet given Greenwich Half-sum horizon glass horizontal parallax hour angle hypotenuse instrument latitude and departure line of numbers line of sines logarithm lower limb mast mean meridian altitude method middle latitude miles minutes moon moon's multiplied Nautical Almanac nearly noon object observed altitude obtained parallel Parallel Sailing passing the meridian perpendicular Plane Sailing points polar distance pole quadrant radius 90 refraction right ascension rule screw sea account secant semidiameter sextant ship ship's side star subtracted sun's declination Suppose taken tangent telescope triangle true altitude true distance true longitude variation wind wires zenith distance
Popular passages
Page 9 - The angle in a semicircle is a right angle ; the angle in a segment greater than a semicircle is less than a right angle ; and the angle in a segment less than a semicircle is greater than a right angle.
Page 299 - Calm Light air Light breeze Gentle breeze Moderate breeze Fresh breeze Strong breeze Moderate gale Fresh gale Strong gale Whole gale Storm Estimatin Observations at sea Sea like mirror.
Page 156 - ... or taking their difference when of contrary names ; the altitude to be reckoned from the south point of the horizon, when the latitude is north, and the contrary when south ; but when the sum exceeds 90°, it is to be taken from 180°...
Page 10 - In like manner, when it is said, that " triangles on the same base, and between the same parallels, are equal...
Page 102 - If the vessel be double-decked, take the length thereof from the fore part of the main stem, to the after part of the stern post, above the upper deck ; the breadth thereof at the broadest part above the main wales...
Page 29 - To find the logarithm of a vulgar fraction. RULE. Subtract the logarithm of the denominator from the logarithm of the numerator...
Page 6 - The VERSED SINE of an arc is that part of the diameter which is between the sine and the arc.
Page 119 - Fiini will be the time of high water, at the given place, reckoning from the noon of the given day. If this sum be greater than 12h.
Page 290 - Davit ; a long beam of timber, used as a crane, whereby to hoist the flukes of the anchor to the top of the bow, without injuring the planks of the ship's sides as it ascends.
Page 11 - KCML, the sum of the two parallelograms or square BCMH ; therefore the sum of the squares on AB and AC is equal to the square on BC.