480 APPLIED MECHANICS 
a stroke of 4 inches, and the other in plane Y has a stroke of 5 inc 
bob-weights are driven by eccentrics on the crank shaft. Determine 
of the bob-weights and the angular positions of their eccentrics, = = 
14. A, B,C, and D are the parallel centre lines of the cylinders of a fi 
cylinder engine, taken in order. The distances between A and B, B and C, 
C and D are 5, 7, and 6 feet respectively. The angle between the cranks of 1 
first two cylinders is 150°, and the reciprocating parts connected to them we 
3500 and 4800 Ibs. respectively. Find the weights of the recip ng pé 
the third and fourth cylinders and the angular positions of their cranks in or 
that the reciprocating parts may balance one another completely. The f 
crank (A) leads. All the pistons have the same stroke. Assume that the 
have harmonic motion, ie 
a5 
bis 
