The Practical Navigator, and Seaman's New Daily Assistant: Being an Epitome of Navigation: Including the Different Methods of Working the Lunar Observations. With Every Particular Requisite for Keeping a Complete Journal at Sea ... To this Edition are Added ... the Requisite Tables Used with the Nautical Almanac in Determining the Longitude at Sea ...
sold, 1791 - 296 sider
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againſt alſo Altitude Anchor Angle Arch Azimuth Baſe becauſe beſt Cape Caſe Co-fine Co-ſecant Co-tang Coaſt Column Compaſs Correótion Courſe and Diſtance Declination Degrees Diff of Lat Difference of Latitude Difference of Longitude Diſt ditto Diviſion E X A M P L E Eaſt Fathoms find the Difference firſt Funchal Glaſs haul High Water Hours Iſland Iſles laſt Latitude and Departure leſs Line of Numbers Line of Sines Logarithm Long meaſured Merid Meridian Meridian Altitude Middle Latitude Miles Moon Moon's moſt muſt neareſt Noon North Objećts Obſ Obſervation oppoſite Parallax paſſing Plane Sailing Point Radius 90 repreſent Right Aſcenſion Riſing ſails ſame Secant ſecond ſee ſet ſeveral ſhe ſhews Ship's ſhould Side Sine ſmall ſome South ſtands Star ſteer ſubtracted ſuch Sun's Suppoſe Table Tangent theſe thoſe Traverſe true uſed Weſt Weſterly Wind
Side 21 - The circumference of every 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 ; and these into thirds, etc.
Side 34 - ... the sum of the segments of the base is to the sum of the sides as the difference of the sides to the difference of the segments of the base.
Side 15 - All fractions found in this line must be decimals ; and if they are not, they must be reduced into decimals, which is easily done by extending the compasses from the denominator to the numerator; that extent laid the same way, from 1 in the middle or right hand, will reach to the decimal required.
Side 267 - A figurative expression for the timbers. /fuie at anchor, is when a ship is held by her anchors, and is not driven by wind or tide. To ride athwart, is to ride with the ship's side to the tide. To ride hoirie fallen, is •when the water breaks into the hawse in a rough sea.
Side 155 - Complement of the Latitude Is to Radius, So is the Sine of the Sun or Star's Declination To the Sine of the true Amplitude ; Which is always of the fame Name with the Declination, whether North or South.
Side 124 - The most usual way of discovering the set and drift of an unknown current, is thus : Let three or four men take a boat a little way from the ship : and by a rope fastened to the boat's stern, let down a heavy iron pot or loaded kettle to the depth of 80 or 100 fathoms ; then heave the log, and the number of knots run out in half a minute will be the miles the current sets per hour, and the bearing of the log will show the set of it.
Side 16 - The solid content of any bale, box, chest, fcc. is found by extending from 1 to the breadth ; that extent will reach from the depth to a fourth number, and the extent from 1 to that fourth number will reach from the length to the solid content.
Side 209 - PM per watch, the altitude of the sun's lower limb was 28° 20' above the horizon of the sea, the eye being elevated 20 feet above the surface of the water, and the sun's bearing by compass S. by W. and at 2h. 58m. 2Gs. PM by watch, the altitude of the sun's lower limb was 16° 41...
Side 168 - A ship lying-to under her mainsail, with her starboard tacks aboard, comes up E. by S. and falls off NE by E. there being one point westerly variation, and she makes 5 points lee-way — what course does she make good ? The middle between E. by S. and NE by E. is E. by N. ; and by allowing 6 points to the left hand (viz.