220 



APPENDIX. 



75-62) 51-810 ( 0-6851 

 453/2 1-0000 



Beam 51-81 

 51-81 



Half stroke 



64380 -3149 

 60496 



38840 

 37810 



10300 



5181 

 41448 

 5181 

 25905 



2684-2761 



289- 



2395-2761 (48-94 



16 51-81 beam 



17 



119 



17 



289 



881795 

 704 



969|9127 



8721 



9784|40661 



100-75 

 -31 49 



100-75 



90675 

 40300 

 10075 

 30225 



-31-726175 

 Parallel bar 37'8l 



Radius bar 6-08 inches. 



22. To find the lengths of the parallel bar and radius bar, when the latter works from a 

 stated centre, as is generally the case for marine engines. 



RULE. Prepare the lengths of the beam and stroke as directed in the last rule, and then 

 proceed as follows : 



From the square of the radius of the beam subtract the square of half the length of stroke, 

 and take the square root of the remainder. 



To this square root add the horizontal distance between the centres of the beam and radius 

 bar ; to the same root add the radius of the beam. 



Multiply the latter of these into half the radius of the beam, and divide by the former ; 

 then the quotient subtracted from the radius of the beam will give the distance of the con- 

 necting bar from the centre of the beam. 



By subtracting this distance from the true radius of the beam, we get the length of the 



