SCALES 

 2:1 3:1 



SCALES 

 4:1 5:1 



I' 1 1 1 1 ' 1 1 1 



«! 9 i^ «! o. - cm m *■ m io ^ co c* 2 £ SNKSj^SSSSSSa 

 I i.ii I. mill. . I m.L I I i I 1 I I I I i , i , I , i . ■ t i ,n I.hJ.m.L,. Im.t.,,,1 I I ! I I I I I , ■ ■ , 1 ■ i , ■ I ,.1, I.... L.,1,,,,1 I I I I 1 I t I I Ufl 



! i i i il 



LOGARITHMIC SCALE 



Given any two corresponding quantities, solve 

 for third by laying rule through points on prop- 

 er scales and read intersection on third scale. 



MANEUVERING BOARD L 



s § g i i § §g§§! iiili 1 I 



1 i I ' I ' I'l I I 1 ll' H ' H 'l i I i I 



Prica ?0 CBfits (porpadof 50) 



I i .1 i I i I i I i I i I i M 



Washington. DC. published Msy. 1920, at Hydrographic Office. 

 under th« iuthority of the SECRETARY OF THE NAVY 



DISTANCE in yards 

 Relative or actual 



g DISTANCE in miles 



SPEED in knots 

 Relative or actual 



New Publication: 4th. Ed.. Apr, 1938 4th. Edition, April 1938 



FIGURE 21. 



39 



