# 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 Latitutde, and the Longitude by Lunar Observations : and Keeping a Complete Reckoning at Sea : the Whole Exemplified in a Journal, Kept from Boston to Madeira : with an Appendix Containg Methods of Calculating Ex\clipses of the Sun and Moon, and Occultations of the Fixed Stars

E. M. blunt, 1826 - 617 σελίδες

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### Περιεχόμενα

 proved Prac 12 19? 19 193 30 Explanations of sea terms 249 the distance of the moon from 60 52 93 6 103 Variation of the compass 113 of the 129
 127To calculate the altitude of 180 138Problems useful in navigation 186 148To determine the height of 192 3 6 Problem W To calculate the Examples for exercise t 11 11 156 1 º 89 64 122

 Second method 141 To find the latitude by one alti 148 To find the time at sea and regu 154 in lunar observations 163 115Second method of working a 174
 tº 6 180 76 187 102 196 tions on shore 205 295

### Δημοφιλή αποσπάσματα

Σελίδα 3 - In any plane triangle, the sum of any two sides is to their difference as the tangent of half the sum of the opposite angles is to the tangent of half their difference. By Theorem II. we have a : b : : sin. A : sin. B.
Σελίδα 20 - To find the logarithm of a vulgar fraction. RULE. Subtract the logarithm of the denominator from the logarithm of the numerator...
Σελίδα 173 - 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 viii - 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 193 - 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 20 - DIVISION BY LOGARITHMS. RULE. From the logarithm of the dividend subtract the logarithm of the divisor ; the remainder will be the logarithm of the quotient EXAMPLE I.
Σελίδα viii - 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 17 - Broadside; a discharge of all the guns on one side of a ship, both above and below.
Σελίδα 192 - ... near the longitude of Sumatra and Java. In the tract between Sumatra and the African coast, and from 3° of south latitude, quite northward to the Asiatic coast, including the Arabian Sea and the Bay of Bengal, the monsoons blow from October to April on the NE and from April to October on the SW In the former half year, the wind is more steady and gentle, and the weather clearer than in the latter six months. In the Red Sea the winds blow nearly nine months of the year from the southward, that...