SCALES 

 2:1 3:1 



180 



tt n <o r» « » H 



■■1 1....I....I i I i I 1 1 1 1 , 



a s s s a s s s s 8 § 3 ft 

 I I I "I I i I i I i 1 1 1 i I i i I i 1 1 1 1 



LOGARITHMIC SCALE 



Given any two corresponding quantities, servo 

 for third by laying rule through points on prop- 

 er scales and read intersection on third scale. 



TIME in minutes 



e a BR9aBBs8S§al § § § § !§§S 1 §§§| I !!!!!!! I 9 



9 3 % 3 ! § SaSSl 5 »?5S 2 3 S SSSSa a 3S»8 8 3 3 88888 g £ DISTANCE in yards 



-H 1 1 1 I | I | i| I | I I H 'I'I'I' I ' I I I ' | l|'l' H ' M 'l' H 'l "" l ' I ' l ll' l 'l'l' l ' I I I Relit*, or actual 



■» . « ......os «■ jj R asgss s 8 DISTANCE in miles 



tft ■o N > » S 



8 $ S S S S3 



SPEED In knots 



MANEUVERING BOARD T , i i . i .iihi i i i i,.„i„„r rSSiSSSi 



Price 60 cents (par pad of 50) 



Washington, D.C, published Hay, 1920, at Hydrographfc Office, 

 undor the authority of the SECRETARY OF THE! NAVY 



FIGURE 31. 



New PubVathxr 4th. Ed, Apr. 1908 



4th. EditMv,, April 1938 



61 



