Scales 



2:1 3:1 







n.iiiiiiii] 



Given any two corresponding quantities, solve 

 tor third by laying rule through points on prop- 

 er scales and read intersection on third scale. 



MANEUVERING BOARD L 



Price 60 cent! (per pad of 50) 



i S_2-S)-S'S8S 8 S DISTANCE In yards 

 | I I'l' l 'l' l — i | i | Relative or actual 

 SSSSS8 s g DISTANCE in miles 



J I I l_l 



a s a s s s s 



I, I, .In,, I 1,11,1,1,] 



SPEED In knots 

 Relative or actual 



WesMngton. C, published Miy. 1920. »t Hydroo/iphic Office, 

 under Uie euthonty ol the SECRETARY OF THE NAVY 



FIGURE 7. 



Now Publication: 4th. Ed.. Ap, . 1938 4th. Editicn, Ajsni 1938 



11 



