pecs 
66 centered at point 73 and axle 90 is forced to move along the 
arcuate line of action 91. Naturally, the here-described linkages 
do not produce a pure sinusoidal motion of the pistons, but instead - 
that motion can be analyzed into its fundamental component at the 
rotor turning frequency plus its second, third, and higher harmonics 
at twice, three times, and higher integer multiples of the rotor 
turning frequency. If, now, axle 90 is unclamped and axle 70 is 
clamped, and if the transport means is thén used to move the center 
ef axle 70 away from 73 along the line 74, it can readily be seen 
that the amplitudes of the fundamental and of all odd-numbered 
harmonic components of the piston motion will fall as compared to 
the amplitudes of the second and all even-numbered components of 
that motion. Further, when the center of axle 76 reaches the point 
67 which is equidistant from the turning points 65 and 62, the fun-~ 
damental and all odd harmonics of the piston motion essentially van- 
ish and only the second and even-numbered harmonic components of the 
motion remein. Hence this system is capable of varying the 
harmonic content of the piston motion in desirable ways, and it can 
in fact be used to suppress the fundamental and all odd-numbered 
harmonics of that motion essentially completely while continuing 
to put out very sizable amounts of the second and all higher even= 
numbered harmonics of the motion. 
As described in section 2 above, this system can be used to switch 
suddenly between the various allowable modes of motion whenever the 
eenter of axle 60 is at its turning point 65. 
Moreover, the systems of section 2 and of this section can be com- 
bined iby usanp a lank 80) an fie. Cl equal to) link 100 an) that) fig— 
ure along with a shorter link Tike that labelled 80 in fig. C2; this 
combination will then permit the abrupt switching of the pistons' 
output motion from that of the rotor frequency plus all higher 
harmonics to that of the second and all higher even-numbered har- 
monics of the rotor frequency. 
4. As a yet further invention, consider the system shown in 
fig. C3. Here the system is the same as shown in fig. C1 except 
that (1) a clamp is introduced at the point 92, and (2) the 
linkage arm 300 is introduced along with a transport system for 
axle 310 and a clamp at the point 330. When axle 90 is clamped 
with its center at point 93, the center of axle 60 is forced to 
move along line 61,and the center of axle 70 must move along 
line 71,and the center of axle 310 must move along the line of 
action 320 (where 320 is determined by a suitable guidance slot, 
for example). If the axle 70 is clamped when its center is at 
point 73 while the axle 90 is then unclamped, the center of axle 
60 will be forced to move along the line 63,and the center of 
axle 90 will be forced to move along the are 91 between the two 
turning points $3 and 92,and the center of axle 310 will be 
forced to move along the line 320 between the two turning points 
311 and 330. If, next, the axle 310 is clamped when its center 
47 
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