The New American Practical Navigator: Being an Epitome of Navigation; Containing All the Tables Necessary to be Used with the Nautical Almanac, in Determining the Latitude, and the Longitude by Lunar Observations ... : With an Appendix Containing Methods of Calculating Eclipses of the Sun and Moon ...Edmund M. Blunt, Proprietor and author of the American coast pilot ; John Gray & Company, Print., 1826 - 617 σελίδες |
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Σελίδα viii
... , 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 viii PREFACE .
... , 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 viii PREFACE .
Σελίδα ix
... plane of the instrument . The following rule was used in calculating this table : Find an arch A such that Log . sine A Log . sine observed angle + log . co - sine of error of inclina- tion . Then the difference between 2 A and the ...
... plane of the instrument . The following rule was used in calculating this table : Find an arch A such that Log . sine A Log . sine observed angle + log . co - sine of error of inclina- tion . Then the difference between 2 A and the ...
Σελίδα xi
... Plane trigonometry Table of solutions of the various cases of trigonometry Right - angled plane trigonometry Questions to exercise the learner in right - angled plane trigonometry Oblique trigonometry A short introduction to astronomy ...
... Plane trigonometry Table of solutions of the various cases of trigonometry Right - angled plane trigonometry Questions to exercise the learner in right - angled plane trigonometry Oblique trigonometry A short introduction to astronomy ...
Σελίδα xiv
... plane parallel to the plane of the in- strument XXXIV Correction of the mean refrac- tion for various heights of the thermometer and barome- XXXV distances XVI ter XXXVI To find the correction and loga- rithm of a lunar observation when ...
... plane parallel to the plane of the in- strument XXXIV Correction of the mean refrac- tion for various heights of the thermometer and barome- XXXV distances XVI ter XXXVI To find the correction and loga- rithm of a lunar observation when ...
Σελίδα 4
... PLANE SUPERFICES is that in which any two points being taken , the straight line between them lies wholly in that surface . IV . PARALLEL LINES are such as are in the same plane and which extended infinitely do never meet , as AB , DC ...
... PLANE SUPERFICES is that in which any two points being taken , the straight line between them lies wholly in that surface . IV . PARALLEL LINES are such as are in the same plane and which extended infinitely do never meet , as AB , DC ...
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Συχνά εμφανιζόμενοι όροι και φράσεις
anchor angular distance apparent altitude arch azimuth bearing calculation central index centre chronometer circle co-sec co-sine column compass corresponding course sailed degrees diameter Diff difference of latitude difference of longitude Dist divided draw elapsed equal equator error EXAMPLE feet Funchal given gives Greenwich half sum horizon glass hour angle hypotenuse instrument latitude and departure line of numbers logarithm mean meridian altitude method middle latitude miles minutes moon moon's multiplied Nautical Almanac nearly noon object observed altitude obtained parallax parallel passing the meridian perpendicular Plane Sailing points poles quadrant radius 90 refraction right ascension rule sea account secant semi-diameter sextant ship ship's side sine square star subtracted sun's declination sun's lower limb Suppose taken tangent telescope tion TRAVERSE TABLE triangle true altitude true distance tude variation watch wind zenith distance
Δημοφιλή αποσπάσματα
Σελίδα 10 - 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 5 - In a right triangle, the side opposite the right angle is called the hypotenuse, and the other two sides the legs.
Σελίδα 187 - 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...
Σελίδα 28 - To find the logarithm of a vulgar fraction. RULE. Subtract the logarithm of the denominator from the logarithm of the numerator...
Σελίδα 240 - Sear up, or bear away, is to change the course of a ship, in order to make her run before the wind...
Σελίδα 13 - TO THEIR DIFFERENCE ; So IS THE TANGENT OF HALF THE SUM OF THE OPPOSITE ANGLES', To THE TANGENT OF HALF THEIR DIFFERENCE.
Σελίδα 205 - The cause of the tides is the unequal attraction of the sun and moon upon different parts of the earth. For they attract the parts of the earth's surface nearest to them, with a greater force than they do its centre : and attract the centre more than they do the opposite surface. To restore this equilibrium the waters take a spheroidal figure, whose longer axis is directed towards the attracting luminary.
Σελίδα 187 - ... take the depth from the under side of the deck plank to the ceiling in the hold, then multiply and divide as aforesaid, and the quotient shall be deemed the tonnage.
Σελίδα 6 - CO-SINE of an arch is the sine of the complement of that arch, or of what that arch wants of a quadrant ; thus AH being a quadrant, the arch SH is the complement of the arch AS ; SZ is the sine of the arch SH, or the co-sine of the arch AS. XXI. The VERSED SINE of an arch is that part of the diameter...
Σελίδα 91 - The index and horizon glasses must be perpendicular to the plane of the instrument, and their planes parallel to each other, when the index division of the vernier is at 0° on the arc ; and the optical axis of the telescope must be parallel to the plane of the instrument. We shall speak separately of each of these adjustments.