. The aviation pocket-book for 1918; a compendium of modern practice and a collection of useful notes, formulae, rules, tables and data relating to aeronautics . s hing coi-rect magnetic N. and S. Place a smallpermanent magnet either before or behind the compass at rightangles to the meridian, with its N. pole on the side of themeridian to whicli the compass points, and iU)vo it towards oraMav from the ccjmpass until tlie latter shows coircct magnetic ^S. (Fig. X). Xvards or from tho compass until the]iosition of the aeroplane as: shown by the compass is exact and W. (Eig. X 1
. The aviation pocket-book for 1918; a compendium of modern practice and a collection of useful notes, formulae, rules, tables and data relating to aeronautics . s hing coi-rect magnetic N. and S. Place a smallpermanent magnet either before or behind the compass at rightangles to the meridian, with its N. pole on the side of themeridian to whicli the compass points, and iU)vo it towards oraMav from the ccjmpass until tlie latter shows coircct magnetic ^S. (Fig. X). Xvards or from tho compass until the]iosition of the aeroplane as: shown by the compass is exact and W. (Eig. X 1. VV .0 dfc A B first small msgnet to corrccffor semicircular dev/^f/on Ek:. C D ^mnd Smsll permsnent naqnfl toTorrtcf semidrtukr devisf/on£ Vertlal bar of soft iron to correctsemicircular deviation Etc. \\ These two adjustmenxs are sufficient 10 correct ariv error due toi^ermanent maguetisaiion of vertical iron or steel pf^rtions of theaeroplane. The next thing is to correct for {\>) above. Tliis is 2l6 PILOTING AND AERIAL NAVIGATION [div. VllI done with the machine still in the magnetic E. and W. position : avertical bar of soft iron is placed on the fore-and-aft line through thecentre of the compass, on the opposite side of the compass to thattowards which the N. on the card tends to point. T)ie bar is movedto and from the compass until tlie aeroj)lane lies exact magnetic W., as shown by the needle (Fig. Y). Quadrantal Deviation.—This is caused by mignotisni induced b}-the earth in horizontal masses of iron or steel. The aeroplaneis placed Avith its longitudinal axis eitlier and , and . and soft iron balls are placed on each
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectaeronautics, bookyear
