The New American Practical Navigator; Being an Epitome of Navigation; Containing All the Tables Necessary to be Used with the Nauticl AlmanacE. & G.W. Blunt, 1846 - 451 pages |
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Page xvi
... subtraction , and denotes that the number following it must be subtracted from those going before it ; thus , 7-5 signifies that 5 must be subtracted from 7 . The sign -is called the negative sign . X is the sign of multiplication , and ...
... subtraction , and denotes that the number following it must be subtracted from those going before it ; thus , 7-5 signifies that 5 must be subtracted from 7 . The sign -is called the negative sign . X is the sign of multiplication , and ...
Page 29
... subtract that number from 9 , and the remainder will be the index of the given fraction . Thus the logarithm of 0,0391 is 8.59218 ; the logarithm of 0.25 is 9.39794 ; the Jogarithm of 0.0000025 is 4.39794 , & c . To find the logarithm ...
... subtract that number from 9 , and the remainder will be the index of the given fraction . Thus the logarithm of 0,0391 is 8.59218 ; the logarithm of 0.25 is 9.39794 ; the Jogarithm of 0.0000025 is 4.39794 , & c . To find the logarithm ...
Page 31
... subtract the logarithm of the divisor ; the remainder will be the logarithm of the quotient . EXAMPLE III . Divide ... subtraction ; hence the quotient is less than unity . INVOLUTION BY LOGARITHMS . RULE . Multiply the logarithm of the ...
... subtract the logarithm of the divisor ; the remainder will be the logarithm of the quotient . EXAMPLE III . Divide ... subtraction ; hence the quotient is less than unity . INVOLUTION BY LOGARITHMS . RULE . Multiply the logarithm of the ...
Page 32
... Subtract the first .. 0.77815 Sum of 2d and 3d .. 2.62325 .Log . 1.22185 To 16.67 .. The answer , therefore , is 16 dollars and fo , or 16 dollars and 67 cents . 67 The answer is 60 miles . Subtract the first . 0.84510 To 60 ...... Log ...
... Subtract the first .. 0.77815 Sum of 2d and 3d .. 2.62325 .Log . 1.22185 To 16.67 .. The answer , therefore , is 16 dollars and fo , or 16 dollars and 67 cents . 67 The answer is 60 miles . Subtract the first . 0.84510 To 60 ...... Log ...
Page 34
... subtract the correction for 60 " . - 25 " , or 35 " , found in the margin S ' ; thus , Logs . for 30 ° 13 ... subtracted , because the logarithms decrease in proceeding backward 35 " from 30 ° 13 ' , to attain 30 ° 12 ′ 25 ′′ . The ...
... subtract the correction for 60 " . - 25 " , or 35 " , found in the margin S ' ; thus , Logs . for 30 ° 13 ... subtracted , because the logarithms decrease in proceeding backward 35 " from 30 ° 13 ' , to attain 30 ° 12 ′ 25 ′′ . The ...
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The New American Practical Navigator; Being an Epitome of Navigation ... Nathaniel Bowditch No preview available - 2015 |
Common terms and phrases
anchor apparent altitude azimuth bearing cable calculation central index centre chord chronometer circle column compass Corr correct central altitude corresponding Cosec cosine degrees diameter diff difference of latitude difference of longitude Dist divided draw elapsed equal equator error EXAMPLE feet given Greenwich Half-sum horizon glass horizontal parallax hour angle hypotenuse instrument latitude and departure line of numbers line of sines logarithm lower limb mast mean meridian altitude method middle latitude miles minutes moon moon's multiplied Nautical Almanac nearly noon object observed altitude obtained parallel Parallel Sailing passing the meridian perpendicular Plane Sailing points polar distance pole quadrant radius 90 refraction right ascension rule screw sea account secant semidiameter sextant ship ship's side star subtracted sun's declination Suppose taken tangent telescope triangle true altitude true distance true longitude variation wind wires zenith distance
Popular passages
Page 9 - 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.
Page 299 - Calm Light air Light breeze Gentle breeze Moderate breeze Fresh breeze Strong breeze Moderate gale Fresh gale Strong gale Whole gale Storm Estimatin Observations at sea Sea like mirror.
Page 156 - ... 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 10 - In like manner, when it is said, that " triangles on the same base, and between the same parallels, are equal...
Page 102 - 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...
Page 29 - To find the logarithm of a vulgar fraction. RULE. Subtract the logarithm of the denominator from the logarithm of the numerator...
Page 6 - The VERSED SINE of an arc is that part of the diameter which is between the sine and the arc.
Page 119 - Fiini will be the time of high water, at the given place, reckoning from the noon of the given day. If this sum be greater than 12h.
Page 290 - Davit ; a long beam of timber, used as a crane, whereby to hoist the flukes of the anchor to the top of the bow, without injuring the planks of the ship's sides as it ascends.
Page 11 - KCML, the sum of the two parallelograms or square BCMH ; therefore the sum of the squares on AB and AC is equal to the square on BC.