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 ix
... secant of A , find this in the column of log - tangents and take out the corresponding natural secant B , then the correction will be 2 ' ( B - 1,55 . ) The numbers in the second co- Jumn are nearly equal to those in the fifth ...
... secant of A , find this in the column of log - tangents and take out the corresponding natural secant B , then the correction will be 2 ' ( B - 1,55 . ) The numbers in the second co- Jumn are nearly equal to those in the fifth ...
Σελίδα xv
... secant of an arch signifies the sine , tangent or secant of the complement of that arch respectively . < Signifies Angle ; with an s at top Angles , < s Ad Angled , A Signifies Triangle . ' s Triangles . Signifies a square . or the Sun ...
... secant of an arch signifies the sine , tangent or secant of the complement of that arch respectively . < Signifies Angle ; with an s at top Angles , < s Ad Angled , A Signifies Triangle . ' s Triangles . Signifies a square . or the Sun ...
Σελίδα 6
... SECANT of an arch is a right line drawn from the centre through one end of the arch to meet the tangent drawn from the other end ; thus CT is the secant of the arch AS . XXV . เ The Co - SECANT of an arch GEOMETRY .
... SECANT of an arch is a right line drawn from the centre through one end of the arch to meet the tangent drawn from the other end ; thus CT is the secant of the arch AS . XXV . เ The Co - SECANT of an arch GEOMETRY .
Σελίδα 7
... SECANT of an arch is the secant of the complement of that arch to a quadrant , thus CG is the secant of the arch SH , or co - secant of the arch AS . XXVI . What an arch wants of a semicircle is called the SUPPLEMENT of the arch , thus ...
... SECANT of an arch is the secant of the complement of that arch to a quadrant , thus CG is the secant of the arch SH , or co - secant of the arch AS . XXVI . What an arch wants of a semicircle is called the SUPPLEMENT of the arch , thus ...
Σελίδα 14
... secant , and CH the co - secant of that arch BD . Then since the triangles CDE , CGB , are simi - F lar or equi - angular we shall have ( by art.54 ) DE : CE :: BG : CB , that is , the tangent of an arch , is to secant of the same , as ...
... secant , and CH the co - secant of that arch BD . Then since the triangles CDE , CGB , are simi - F lar or equi - angular we shall have ( by art.54 ) DE : CE :: BG : CB , that is , the tangent of an arch , is to secant of the same , as ...
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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.