SCALES 

 2:1 3:1 



SCALES 

 4:1 5:1 



LOGARITHMIC SCALE 



Grrtn any two corresponding quantities, solve 

 for third by laying rule through points on prop- 

 er scales and read intersection on third scale. 



TIME In minutes 



. . 8 s s ssBBSsiiiiii I §§§!!!§ iiiil III III1I 11 



I > 1 1 1 I I ' I 'I I I I |l> W l'l I 1 I I ' | l| ' l' i'l 'l'l' H ' H"" l ' I 'I' H ' H 'I ' I ' I R«Wiw or actual 



m « « n«K«« s rn fl <qgs?!?s » g DISTANCE In miles 



MANEUVERING BOARD L 



Pritfl 60 cerrts (per pad of 50) 



O in ° ** ° m 9 8 S 



■ 7 , T i T'iTiTiTiTiTiTt.,,7 — 7..,,7,.,.7..,",, i i„..i„„u„„i 



SPEED in knots 

 Relative., or actual 



Washington. DC, published May. 1S20, ol Hydrapsphx Offia, 

 tinder Ihe miBwrity <rf iho S£CR£JART Of TKE HAW 



FIGURE 39. 



NarftABSDEon: «h. &£. Apr, 1933 



4&v ZdHj;*, /<rM 1538 



77 



