The American Practical Navigator: Being an Epitome of Navigation and Nautical AstronomyU.S. Government Printing Office, 1888 - 647 páginas |
Dentro del libro
Resultados 1-5 de 65
Página 3
... nearly 30 , note the point which is nearly of the distance between the marks 7 and 8 , and this will be the point representing 1728 . If the point representing 435 was required , from the 4 in the second interval count toward 5 on the ...
... nearly 30 , note the point which is nearly of the distance between the marks 7 and 8 , and this will be the point representing 1728 . If the point representing 435 was required , from the 4 in the second interval count toward 5 on the ...
Página 4
... nearly similar to those of the sines . With any extent in the compasses , to be set off from any number less than 45 on the line of tangents , toward the right , and it is found to reach beyond the mark of 45 ° , see how far it extends ...
... nearly similar to those of the sines . With any extent in the compasses , to be set off from any number less than 45 on the line of tangents , toward the right , and it is found to reach beyond the mark of 45 ° , see how far it extends ...
Página 6
... nearly . In the U. S. Navy the log - glasses being usually 28 seconds and 14 seconds , the proportion must be-- x , being the length of the knot . Hence , 3600 : 608028 Hec : x x = = 47.29 , or 47ft 3in . The speed of the ship is ...
... nearly . In the U. S. Navy the log - glasses being usually 28 seconds and 14 seconds , the proportion must be-- x , being the length of the knot . Hence , 3600 : 608028 Hec : x x = = 47.29 , or 47ft 3in . The speed of the ship is ...
Página 12
... nearly propor- tional to the sine of twice the azimuth . That part of the fore - and - aft force which is proportional to the sine of the azimuth produces a minimum when the ship's head is N. or S. , and a maximum when E. or W .; but ...
... nearly propor- tional to the sine of twice the azimuth . That part of the fore - and - aft force which is proportional to the sine of the azimuth produces a minimum when the ship's head is N. or S. , and a maximum when E. or W .; but ...
Página 16
... nearly as possible a curve . Should the deviations be determined on correct magnetic courses , the plain line is used instead of the dotted , but this is very rarely the case in practice . I On the vertical line take the given compass ...
... nearly as possible a curve . Should the deviations be determined on correct magnetic courses , the plain line is used instead of the dotted , but this is very rarely the case in practice . I On the vertical line take the given compass ...
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Otras ediciones - Ver todas
The American Practical Navigator: Being an Epitome of Navigation and ... Nathaniel Bowditch,George Wood Logan,United States Navy Dept Bureau of Equ Sin vista previa disponible - 2015 |
The American Practical Navigator: Being an Epitome of Navigation and ... Nathaniel Bowditch,United States. Navy Dept. Bureau Of Equi Sin vista previa disponible - 2014 |
The American Practical Navigator: Being an Epitome of Navigation and ... Nathaniel Bowditch,United States Navy Dept Bureau of Navi Sin vista previa disponible - 2015 |
Términos y frases comunes
A. M. Hour P. M. Africa altitude Australia azimuth barometer Bay of Fundy bearing Cape centre chart Chro chronometer circle column Comdr Corr correction corresponding cosec Cosine Cotangent course and distance declination deviation Diff difference of latitude difference of longitude Dist East Coast English survey equator error Extreme feet Flag-staff FULL AND CHANGE Greenwich Greenwich mean Gulf Gulf of St Harbor High Water horizon Hour A. M. Hour hour angle instrument Island Islet Latitude and Departure Lieut light Light-House List log sec Logarithms Magellan Strait MARITIME POSITIONS meridian middle latitude miles Moon's Nautical Almanac Navigator Noon North observed parallax parallel Patagonia Paumotu Paumotu or Low Plane Sailing Port refraction right ascension River scale Secant sextant ship ship's head sine South Coast star Strait Summit sun's Table Tangent telescope variation West Coast wind ΙΟ ΙΟΙ
Pasajes populares
Página 635 - 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.
Página 636 - In like manner, when it is said, that " triangles on the same base, and between the same parallels, are equal...
Página 142 - Irish coast a lee shore; the ship was then kept close to the wind and several tacks made to preserve her position as nearly as possible until daylight, when, nothing being in sight, she was kept on ENE under short sail with heavy gales. At about 10 am an altitude of the Sun was observed and the chronometer time noted; but, having run so far without...
Página 627 - To find the logarithm of a vulgar fraction. RULE. Subtract the logarithm of the denominator from the logarithm of the numerator...
Página 632 - The circumference of a circle is supposed to be divided into 360 equal parts called degrees, and each degree into 60 equal parts called minutes, and each minute into 60 equal parts called seconds, &c.
Página 632 - A sphere is a solid bounded by a surface, every point of which is equally distant from a fixed point called the centre.
Página 632 - A plane rectilineal angle is the inclination of two straight lines to one another, which meet together, but are not in the same straight line.
Página 133 - Greenwich mean time, beginning at noon ; the dates are therefore astronomical. All the distances that can be observed on the same day are grouped together under that date ; and the columns are read from left to right, across both pages of the same opening. The letter W., or E., is affixed to the name of the sun, plauet, or star, to indicate that it is on the west, or east, side of the moon.
Página 626 - ... the difference between this logarithm and the next greater, and multiply it by the given number exclusive of the four first figures ; cross off at the right hand of the product as many figures as you had figures of the given number to multiply by ; then add the remaining left-hand figures of this product to the logarithm taken from the table, and to the sum prefix an index equal to one lese than the number of integral figures in the given number, and you will have the sought logarithm.
Página 142 - ... altitude must have happened at all the three points and at Small's light, and at the ship, at the same instant of time ; and it followed, that Small's light must bear ENE, if the Chronometer was right. Having been convinced of this truth, the ship was kept on her course. ENE, the wind being still SE, and in less than an hour, Small's light was made bearing ENE }^E., and close aboard.