## American Practical Navigator (Google eBook) |

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I think this book is wonderful with rich talents of a boy and the way he looks at things.

### Common terms and phrases

anchor angle arch bearing brace cable calculated Cape centre Co-secant co-sine Co-tang column compass correction corresponding course course sailed degrees Degs diameter Diff difference of latitude difference of longitude Dist distance eclipse equal equator error EXAMPLE feet Funchal given Greenwich haul head head sails helm horizon glass horizontal parallax hypotenuse Island larboard Latitude and Departure limb line of numbers logarithm Long marked mast mean meridian altitude method middle latitude miles mizen moon moon's multiplied Nautical Almanac nearly noon parallax parallel perpendicular plane Plane Sailing radius refraction rope rule sails sea account Secant semi-diameter sextant ship ship's Shoal side sine star star's staysail subtracted sun's right ascension tack taken tangent tide topsail TRAVERSE TABLE triangle true true longitude tude variation veer wind windward

### Popular passages

Page 10 - In any triangle, the sum of the three angles is equal to two right angles, or 180°.

Page 120 - ... or taking their difference when of contrary names ; the altitude to be reckoned from the south point of the horizon, when the latitude is north, and the contrary when south ; but when the sum exceeds 90°, it is to be taken from 180°...

Page 186 - To find the solidity of a pyramid and of a cone. RULE. — Multiply the area of the base by one third of its altitude, and the product will be its solidity.

Page 203 - 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.

Page 32 - To find the logarithm of a vulgar fraction. RULE. Subtract the logarithm of the denominator from the logarithm of the numerator...

Page 208 - ... the miles the current sets per hour, and the bearing of the log will show the set of it. There is a very remarkable current, called the GULF STREAM, which sets in a north-east direction along the coast of America, * From Nathaniel Bowditch, THE NEW AMERICAN PRACTICAL NAVIGATOR, E.

Page 17 - TO THEIR DIFFERENCE ; So IS THE TANGENT OF HALF THE SUM OF THE OPPOSITE ANGLES', To THE TANGENT OF HALF THEIR DIFFERENCE.

Page 594 - In spherical triangles, whether right angled or oblique angled, the sines of the sides are proportional to the sines of the angles opposite to them.

Page 186 - 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...