RULES FOR CALCULATING THE STEAM ENGINE. 



217 



and divide the product by the sum of the two numbers, we shall get the respective distances 

 of the required point from the beam and radius bar. (231.) 



Example. The radius of the beam is 7 feet, the length of the radius bar 4 feet, the link 

 2 feet, and the length of the stroke 5 feet ; required the point of connexion of the 

 piston rod. 



Half length of stroke = 2-5 feet. 

 2-5)7-0(2-8 2-5)4-0(1-6 



5-0 25 



200 

 200 



Quotients 2'8 



2-8 



224 

 56 



150 

 150 



Squares 7'84 

 Subtract 1 



6-84 



Square roots 2-6153 

 Subtracted from quotients -1847 



1-6 

 1-6 



96 

 16 



2-56 

 1 



1-56 

 1-2490 



3510 



Numbers/' 1847 

 I -3510 



1847 

 Link 2 



Sum -5357 



535 7) -3694,0 (0-69 

 32142 



47980 



3510 

 Link 2 



5357)7020(1-31 

 5357 



16630 

 16071 



5590 



The distance of the required point from the end of the beam is therefore 0-69 feet or 8-28 

 inches, and the distance from the end of the radius bar is 1-31 feet or 1 foot 3- 72 inches. 



N.B. As a check against any gross blunder, the distances multiplied by the respective lengths 

 of the beam and radius bar ought to give nearly equal results. In the present case 



