132 HANDBOOK OF MAGNETIC COMPASS 



IX. Practical procedure for adjusting different effects (see cli. VII) : 



A. Curve analysis. 



B. Simple one-swing method. 



X. Pi'actice session : 



A. Adjust your compass, and hand in the original" and final deviation curves 

 (plotted against both compass and magnetic heading) as well as the 

 estimated coeflScients and sequence of your procedure. (Note that 

 deviations are same for compass and magnetic headings, after ad- 

 justment.) 



XI. Calculation of sun's azimuths (see ch. VI) : 



A. Time: 



1. Local apparent time (L. A. T.). 



2. Equation of time (Eq. T.). 



3. Longitude correction. 



4. Time zones. ' 



5. Other time nomenclature. 



(a) G. C. T. 

 (6) G. A. T. 

 (c) Std. T. 

 id) L. C. T. 



6. Hour angle (H. A.), Meridian angle it). i 



B. Azimuth tables (H. O. 71 and H. O. 214) : 



1. Declination, contrary name with latitude. 



2. Declination, same name with latitude. 



3. Latitude, declination, L. A. T. 



4. Rules for a. m. and p. m., noi'th and south latitudes. 



C. Simplified use of L. A. T. watch and prepared azimuth tables. 



D. Prepare the proper azimuth table for the ensuing practice session. 



XII. Practice session : 



A. Complete adjustment on a binnacle, using the sun's azimuths. 



B. Complete adjustment on a binnacle, using a bearing on a distant object. 



(Hand in deviation curves, procedure, and estimated coefficients.) 



XIII. Complete shipboard procedure for making a magnetic adjustment (see 



ch. I and VII) : 



A. Use of dip needle (ch. XV). 



B. Physical check of equipment (ch. I). 



XIV. Demonstration of degaussing coil compensation. 



XV. Complete shipboard procedure for making a compass coil compensation. 



(Seech. X.) 



XVI. Miscellaneous problems : 



A. Frozen compasses — Sluggish and unsteady (art. 33). 



B. Corrector effects (ch. VIII). 



C. Slewing spheres (ch. XVII). 



D. Flinders bar adjustment (ch. VIII). 



E. Gaussin error (art. 105). 



F. Transients (ch. IX). 



G. Remote reading compasses (ch. XIX). 

 H. Slewing Flinders bar (ch. XVIII). 



I. One heading adjustment (Kielhorn). 



J. Complete mathematical analysis (Kielhorn and British Admiralty 



Manual). 

 K. Use of the horizontal force iustnimeut (ch. XVI). 



XVII. Final examination. 



