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 |
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Page viii
... angle arising from a deviation of l ' in the parallelism of the surfaces of the central mirror , those surfaces being supposed to be perpendicular to the plane of the instrument . The correction in the fifth column of this table ...
... angle arising from a deviation of l ' in the parallelism of the surfaces of the central mirror , those surfaces being supposed to be perpendicular to the plane of the instrument . The correction in the fifth column of this table ...
Page 5
... angle is usually expressed by the letter placed at the angular point , as the angle A. But when two or more angles are at the same point , it is then necessary to express each by three letters , and the letter at the angular point is ...
... angle is usually expressed by the letter placed at the angular point , as the angle A. But when two or more angles are at the same point , it is then necessary to express each by three letters , and the letter at the angular point is ...
Page 6
... angles , ABD , ABC , is always equal to two right angles . For , on the point B as a centre , describe the circular arc CAD , cutting the line CD in C and D ; then ( by Art . 6 ) , this arc is equal to a semicircle , but it is also ...
... angles , ABD , ABC , is always equal to two right angles . For , on the point B as a centre , describe the circular arc CAD , cutting the line CD in C and D ; then ( by Art . 6 ) , this arc is equal to a semicircle , but it is also ...
Page 7
... angle BEA is equal to the angle CED . After the same manner we may prove that the angle BEC is equal to the angle AED . XXIX . B If a line , GH , cross two parallel lines , AB , CD , it makes the external opposite angles equal to each ...
... angle BEA is equal to the angle CED . After the same manner we may prove that the angle BEC is equal to the angle AED . XXIX . B If a line , GH , cross two parallel lines , AB , CD , it makes the external opposite angles equal to each ...
Page 8
... angles be known , the sum of the other two will be also known . For by the last article the sum of all three angles is equal to two right angles , or 180 ° ; hence , by subtracting the given angle from 180 ° , the remainder will be the ...
... angles be known , the sum of the other two will be also known . For by the last article the sum of all three angles is equal to two right angles , or 180 ° ; hence , by subtracting the given angle from 180 ° , the remainder will be the ...
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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.