A Complete Epitome of Practical Navigation ...author, and sold, 1852 - 688 páginas |
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Página vi
... given a particular description , with the uses , of the various astronomical Instru- ments employed in taking the Observations . In this part of the Work I have given Mr. Douwes ' Rules for computing the Lati- tude by two Altitudes of ...
... given a particular description , with the uses , of the various astronomical Instru- ments employed in taking the Observations . In this part of the Work I have given Mr. Douwes ' Rules for computing the Lati- tude by two Altitudes of ...
Página 7
... given decimal consists of , and those to the left - hand will be an integer number : then multiply the remaining decimals by the number of parts contained in the next inferior denomination , and point off the decimals as before ...
... given decimal consists of , and those to the left - hand will be an integer number : then multiply the remaining decimals by the number of parts contained in the next inferior denomination , and point off the decimals as before ...
Página 8
... given to find a fourth proportional , the method by which it is performed is called the RULE OF THREE , and is the same in decimals as in common Arithmetic : viz . by multiplying the second and third terms together , and dividing the ...
... given to find a fourth proportional , the method by which it is performed is called the RULE OF THREE , and is the same in decimals as in common Arithmetic : viz . by multiplying the second and third terms together , and dividing the ...
Página 10
... given number is raised , the index of that power : hence , to raise or involve a number to a given power , multiply its logarithm by the index of the power to which it is to be raised , and the product will be the logarithm of the power ...
... given number is raised , the index of that power : hence , to raise or involve a number to a given power , multiply its logarithm by the index of the power to which it is to be raised , and the product will be the logarithm of the power ...
Página 19
... given line AB into two equal parts at the point E. In this manner any arch of a circle may be divided into two equal parts . PROBLEM II . From a given Point c , in a given right Line A в , to raise a Perpendicular . CASE 1st . When the ...
... given line AB into two equal parts at the point E. In this manner any arch of a circle may be divided into two equal parts . PROBLEM II . From a given Point c , in a given right Line A в , to raise a Perpendicular . CASE 1st . When the ...
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Términos y frases comunes
angle apparent distance arch Argo Navis Cape St centre Chro chronometer Co-sec Co-sine Co-tan Coast compass Corr correction corresponding course and distance degrees Diff difference of latitude difference of longitude Dist Ditto entr equal Equation EXAMPLE extent will reach feet given Greenwich mean horizon index error Island Latitude and Departure LATITUDES AND LONGITUDES Light line of numbers line of sines logarithm LOGARITHMIC SINES meridian altitude middle latitude miles minutes moon Moon's apparent altitude Natural Versed Nautical Almanac nonius noon North North Island observed altitude observer's eye parallel perpendicular planet Port Porto Santo Pulo radius Reef refraction remainder right ascension Rock sails Secant semidiameter sextant ship ship's Shoal sine South East Point South Point star Star's subtracted Sun's declination sun's lower limb Table taken Tang tangent true distance true longitude variation West zenith distance
Pasajes populares
Página 20 - A circle is a plane figure bounded by a curved line called the circumference, every point of which is equally distant from a point within called the center, Fig.
Página 17 - Multiply the index of the quantity by the index of the power to which it is to be raised, and the result will be the power required.
Página 16 - DIVISION BY LOGARITHMS. RULE. From the logarithm of the dividend subtract the logarithm of the divisor, and the number answering to the remainder will be the quotient required.
Página 159 - Astronomers, with a view of obtaining a convenient and uniform measure of time, have recourse to a mean solar day, the length of which is equal to the mean or average of all the apparent solar days in a year. An imaginary Sun, called the mean Sun...
Página 5 - LV. contains the times of high water on the full and change of the moon, with the vertical rise of the tide, at many ports, harbors.
Página 15 - Consequently, when the first three terms of a proportion are given, the fourth is found by multiplying the second and third terms together, and dividing the product by the first term.
Página 231 - ... will be double the altitude of the sun's limb above the horizontal plane ; to the half of which, if the semidiameter, refraction, and parallax be applied, the result will be the true altitude of the centre.
Página 20 - For the purpose of measuring angles, the circumference is divided into 360 equal parts, called degrees ; each degree into 60 equal parts, called minutes ; each minute into 60 equal parts called seconds.
Página 52 - TO THEIR DIFFERENCE ; So IS THE TANGENT OF HALF THE SUM OF THE OPPOSITE ANGLES', To THE TANGENT OF HALF THEIR DIFFERENCE.
Página 37 - ... division. Or the extent from any division to another on the line of meridional parts, applied to the line of equal parts, will give the meridional difference of latitude between the two places denoted by the divisions.