A Treatise on Marine Surveying: Prepared for the Use of Younger Naval Officers, with Questions for Examination and Exercises, Principally from the Papers of the Royal Naval College, with the ResultsMacmillan, 1882 - 307 pages |
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Page 30
... Least Reading * of the Vernier , and expresses the degree of minuteness to which we are enabled to read by its aid ... Reading , " and " Least Count . " .. pl - v = pl - рп - 1 30 [ CHAP . MARINE SURVEYING .
... Least Reading * of the Vernier , and expresses the degree of minuteness to which we are enabled to read by its aid ... Reading , " and " Least Count . " .. pl - v = pl - рп - 1 30 [ CHAP . MARINE SURVEYING .
Page 31
... Least Reading ( which under all circumstances is the nth part of 7 ) , but by taking p as 2 or 3 we gain the advantage of being able to distinguish without difficulty the marks in exact coincidence . In the case of the sextant , n is ...
... Least Reading ( which under all circumstances is the nth part of 7 ) , but by taking p as 2 or 3 we gain the advantage of being able to distinguish without difficulty the marks in exact coincidence . In the case of the sextant , n is ...
Page 32
... Least Reading . Result of 10 ′ = 5 " . ( 2 ) If a limb be divided to 10 ' , and 59 of these be taken for the length ... Least Reading . Result of inch inch . = 100 ( 4 ) If 29 spaces of 10 ' be divided into 30 parts , find the Least ...
... Least Reading . Result of 10 ′ = 5 " . ( 2 ) If a limb be divided to 10 ' , and 59 of these be taken for the length ... Least Reading . Result of inch inch . = 100 ( 4 ) If 29 spaces of 10 ' be divided into 30 parts , find the Least ...
Page 34
... Least Reading . ( May , '80 ) . 3600 " Result . mp ( 12 ) The limb is divided to 10 ′ , and m divisions on the limb are equal to n divisions on the vernier ; find the Least Reading ( June , '80 ) . Result . 600 " n ( 13 ) If the degrees ...
... Least Reading . ( May , '80 ) . 3600 " Result . mp ( 12 ) The limb is divided to 10 ′ , and m divisions on the limb are equal to n divisions on the vernier ; find the Least Reading ( June , '80 ) . Result . 600 " n ( 13 ) If the degrees ...
Page 36
... Reading is 35 ° 41 ′ 10 ′′ No.2 . 210 Reading is 20 ° 1 ' 20 " No.3 . 510 8 Limb Vernier Limb Vernier Limb Vernier The Index is between 320 20 ′ and 32o 30 ' . The Reading by the ... least reading ; this should 36 [ CHAP . MARINE SURVEYING .
... Reading is 35 ° 41 ′ 10 ′′ No.2 . 210 Reading is 20 ° 1 ' 20 " No.3 . 510 8 Limb Vernier Limb Vernier Limb Vernier The Index is between 320 20 ′ and 32o 30 ' . The Reading by the ... least reading ; this should 36 [ CHAP . MARINE SURVEYING .
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A Treatise on Marine Surveying: Prepared for the Use of Younger Naval ... J. L. Robinson No preview available - 2018 |
Common terms and phrases
barometer base line beach bearing and distance Buoy centre Chron chronometer Cliff coast computed construction correct daily rate difference divided Draw equal error extend from lat fathoms feet fixed Flagstaff harbour height Hence High island high water horizontal inches instrument interval islet known latitude Least Reading length Light Lighthouse longitude Lough Foyle low water lunitidal intervals marked mean measured Mercator's chart Meridian Distance method miles moon natural scale nautical mile Neap object Observatory observed angles Ordnance Survey parallel peak plane Project Protract radius reef represent Result Rock awash Royal Naval College sand scale of chords screw seconds segment sextant shew ship Ship's shoal shore side Signal hill soundings Spring Tides station straight line Sun's survey taken telescope temperature Theodolite tidal tide gauge Tide Tables transverse distance triangle true bearing Variation vernier vernier circle vertical Windmill yards zero
Popular passages
Page 53 - ... the three angles of a triangle are together equal to two right angles, although it is not known to all.
Page iii - Robinson. — TREATISE ON MARINE SURVEYING. Prepared for the use of younger Naval Officers. With Questions for Examinations and Exercises principally from the Papers of the Royal Naval College. With the results. By Rev. JOHN L. ROBINSON, Chaplain and Instructor in the Royal Naval College, Greenwich. With Illustrations. Crown 8vo.
Page 180 - It remains to be noticed that the direction of strong winds, as well as the varying pressure of the atmosphere, considerably affect both the times and the heights of high water. Thus in the North Sea a strong NNW gale and a low barometer raise the surface 2 or 3 feet higher...
Page 166 - The sphere of the attractive virtue which is in the moon extends as far as the earth, and entices up the waters ; but as the moon flies rapidly across the zenith, and the waters cannot follow so quickly, a flow of the ocean is occasioned in the torrid zone towards the westward.
Page 145 - Shew that, if each of the angles of a spherical triangle, whose sides are small when compared with the radius of the sphere, be diminished by one-third of the spherical excess, the triangle may be solved as a plane triangle whose sides are equal to the sides of the spherical triangle, and whose angles are these reduced angles.
Page xvi - Nautical Surveying,— Use of Charts ; Rating of Chronometers ; Determination of Meridian Distance ; Selection and Measurement of a Base Line ; Determination of Latitude, Longitude, and True Bearing ; Triangulation ; Levelling ; Soundings: Fixing Positions: Tide Gauge; Establishment oí the Port ..... 12. Instruments. — Construction and Use of Marine Barometer, Sextant. Artificial Horizon, Azimuth Compass, Theodolite, and Level . .
Page 15 - ... and strong rippling all round the edge, by which the bank may generally be discovered. Beyond this point the streams unite and flow on towards Howth and Lambay, growing gradually weaker as they proceed, until they ultimately expend themselves in a large space of still water situated between the Isle of Man and Carlingford.
Page 53 - The angle at the centre of a circle is double the angle at the circumference on the same arc.
Page 53 - The opposite angles of a quadrilateral inscribed in a circle are together equal to two right angles, with converse.
Page 189 - Portland, there are what are termed the first and sccunil high waters. This double high water is probably caused by the tidal stream at Spithead, for, as long as that stream runs strong to the westward the tide is kept up in Southampton water, and there is no fall of consequence until the stream begins to slack at Spithead, but when the stream makes to the eastward at Spithead the water falls rapidly at Southampton. After low water, the...