The American Practical Navigator: Being an Epitome of Navigation and Nautical AstronomyU.S. Government Printing Office, 1888 - 647 σελίδες |
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Σελίδα 70
... limb in the plane of the instrument whose centre is at I , each half - degree of this arc reading as 1 ° ; H , the horizon glass attached to the frame ; EH , the line of sight , either through a telescope or through a sight- vane ...
... limb in the plane of the instrument whose centre is at I , each half - degree of this arc reading as 1 ° ; H , the horizon glass attached to the frame ; EH , the line of sight , either through a telescope or through a sight- vane ...
Σελίδα 71
... limb , should be a plane , and with its vernier accurately divided ; 3d . The axis should be at the centre of the limb , and perpendicular to its plane ; 4th . The index and horizon glasses should be perpendicular , and the line of ...
... limb , should be a plane , and with its vernier accurately divided ; 3d . The axis should be at the centre of the limb , and perpendicular to its plane ; 4th . The index and horizon glasses should be perpendicular , and the line of ...
Σελίδα 72
... limb of an instrument , by which aliquot parts of the smallest spaces into which the scale or limb is divided are measured . It consists of a piece similar to the scale or arc to be read , and along which it slides . The length of this ...
... limb of an instrument , by which aliquot parts of the smallest spaces into which the scale or limb is divided are measured . It consists of a piece similar to the scale or arc to be read , and along which it slides . The length of this ...
Σελίδα 73
... limb of the moon is perfect ; observing that the point of contact of the limb of the moon and star must always be in the middle between the parallel wires . The observation being thus made , the index will point out the distance of the ...
... limb of the moon is perfect ; observing that the point of contact of the limb of the moon and star must always be in the middle between the parallel wires . The observation being thus made , the index will point out the distance of the ...
Σελίδα 74
... limb , want of parallelism in the surfaces of the mirrors and colored glasses , and entirely avoiding the error which might arise in a sextant from the mirrors not being parallel when the index is on o . Fig . 54 represents the Circle ...
... limb , want of parallelism in the surfaces of the mirrors and colored glasses , and entirely avoiding the error which might arise in a sextant from the mirrors not being parallel when the index is on o . Fig . 54 represents the Circle ...
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Άλλες εκδόσεις - Προβολή όλων
The American Practical Navigator: Being an Epitome of Navigation and ... Nathaniel Bowditch,George Wood Logan,United States Navy Dept Bureau of Equ Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2015 |
The American Practical Navigator: Being an Epitome of Navigation and ... Nathaniel Bowditch,United States. Navy Dept. Bureau Of Equi Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2014 |
The American Practical Navigator: Being an Epitome of Navigation and ... Nathaniel Bowditch,United States Navy Dept Bureau of Navi Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2015 |
Συχνά εμφανιζόμενοι όροι και φράσεις
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
Δημοφιλή αποσπάσματα
Σελίδα 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.
Σελίδα 636 - In like manner, when it is said, that " triangles on the same base, and between the same parallels, are equal...
Σελίδα 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...
Σελίδα 627 - To find the logarithm of a vulgar fraction. RULE. Subtract the logarithm of the denominator from the logarithm of the numerator...
Σελίδα 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.
Σελίδα 632 - A sphere is a solid bounded by a surface, every point of which is equally distant from a fixed point called the centre.
Σελίδα 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.
Σελίδα 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.
Σελίδα 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.
Σελίδα 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.