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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Side 39
... some Idea of the System of the Universe , come monly called the Solar , or Coper nican System , which is as follows : The Sun , that immense and amazing Globe of Fire , the Fountain of the Heat and Light of the whole System , is placed ...
... some Idea of the System of the Universe , come monly called the Solar , or Coper nican System , which is as follows : The Sun , that immense and amazing Globe of Fire , the Fountain of the Heat and Light of the whole System , is placed ...
Side 116
... some convenient Place , draw the Compafs . In like Manner may a Chart be made that fhall contain any Number of Degrees and Minutes required . When the Chart is not to commence from the Equator , but is only to ferve from a certain ...
... some convenient Place , draw the Compafs . In like Manner may a Chart be made that fhall contain any Number of Degrees and Minutes required . When the Chart is not to commence from the Equator , but is only to ferve from a certain ...
Side 135
... some Diseases are properly the Effects of the Influence of the heavenly Bodies . 2. That the moft windy Seafons of the Year are about the vernal and autumnal Equinoxes . 3. All the Changes we have enumerated in the Atmosphere do fall ...
... some Diseases are properly the Effects of the Influence of the heavenly Bodies . 2. That the moft windy Seafons of the Year are about the vernal and autumnal Equinoxes . 3. All the Changes we have enumerated in the Atmosphere do fall ...
Side 136
... Some of thefe Globes have been made fo large as to carry up Men with them , as have frequently been seen in Britain , France , and other Parts . NOTE . The Swiftnefs of Wind in a great Storm is not more than 50 or 60 Miles in an Hour ...
... Some of thefe Globes have been made fo large as to carry up Men with them , as have frequently been seen in Britain , France , and other Parts . NOTE . The Swiftnefs of Wind in a great Storm is not more than 50 or 60 Miles in an Hour ...
Side 137
... some Time . But when the Sun and the Moon act cross - ways , or are 90 ° afunder , the Tides are leffened in Proportion to the Difference of their Powers of At- traction , and produce what we call Neap Tides , which happen foon after ...
... some Time . But when the Sun and the Moon act cross - ways , or are 90 ° afunder , the Tides are leffened in Proportion to the Difference of their Powers of At- traction , and produce what we call Neap Tides , which happen foon after ...
Vanlige uttrykk og setninger
againſt alfo Altitude Anchor Angle Arch Azimuth Bafe becauſe Cafe Cape Chart Co-fecant Co-fine Co-tang Coaft Column Compafs Courfe Courſe Declination Degrees Diff Difference of Latitude Difference of Longitude Dift Dep Dift Lat ditto Eaft Epact Equator Extent will reach fails fame Fathoms fecond fhews fhould find the Courſe find the Difference firft firſt fome ftands fteer fubtract fuch Funchal half haul High Water Hour Angle Hours Ifland laft Latitude and Departure lefs Line of Numbers Line of Sines Logarithm Long meaſured Mercator's Sailing Merid Meridian Meridian Altitude Middle Latitude Miles Moon Moon's muſt N.fine neareſt Noon North Obfervation oppofite Parallax parallel Place Plane Sailing Point Radius Rifing Right Afcenfion Secant ſhe Ship Ship's Side South Star Star's Sun's Suppofe Table Tangent thefe theſe thofe uſed Variation Weft Wefterly Wind ΙΟ
Populære avsnitt
Side 19 - 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 14 - EXAMPLE. If the diameter of a circle be 7 inches, and the circumference 22, what is the circumference of another circle, the diameter of which is 14 inches ? Extend from 7 to 22, that extent will reach from 14 to 44 the same way.
Side 32 - ... 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 14 - 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 263 - 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 151 - 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 120 - 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 14 - 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 205 - 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 164 - 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.