SCALES 

 2:1 3:1 



LOGARITHMIC SCALE 



Given any two corresponding quantities, sotve 

 tx third try laying rule through points on prop- 

 er scales and read intersection on third scale. 



MANEUVERING BOARD L 



Prica 60 centa (pur pad of 5D) 



TIME In minutes 



■ a a s imn!!!H! ! 1 !!IS!!!!S! Ill SIIII il m**** 



-h 1 . | ■ 1 I | i| | | IIIMO' I'1 ' 1 ■ I ■ hl i H 'I ' I' l i M 'I' l' . "" , ' I ' M ' 1 'l' l' l i I ' I Relative or actual 



h n « »«'-«>«S = R RRSSS8 R g DISTANCE in miles 



M m t ib 10 r- » &, 2 £ 8 R R c> 3 8 8 



j I i I i I, i I i I i I i I i in ...I ....I I„„i„„l„„i„„l 



v:r,;i\-c.-. D.C., puHistaJ Mi-. 1920, at tfrdra > g«C Office, 



uAtfer to» authority cf tha SfCHETAffT OF THE IWVY Hav PvMeatac 4th. Ed, Apr, 1938 4th. Zhtiaa, AprR 1938 



FIGURE 40. 



SPEED In knots 

 Relitiw or actual 



No.2S65o 



o 



79 



