^CenferAC 



SCALES 

 2:1 3:1 



38— | 57— | 



SCALES 

 4:1 5:1 

 r- 76p-95 



Given any two corresponding quantities, solve 

 far ttiird by laying rule "through points onorop- 

 er scales and read intersection on third scale. 



MANEUVERING BOARD 



Prica 60 cents (per pad of 50) 



SPEED in knots 

 Relative or actual 



Washington. DC, published May. 1920. »l Hydfojraphic Office, 

 undw the airlhwity ol tho SECRETARY Of THE NAVY 



FIGURE 22. 



Nm PuMK*tcn: 4th. Ea\, fift* 1933 



4th. Ldiiu r. *jyil 1938 



No. 2665 a 



593040°— 1 4 



41 



