PAS Teh nme ent anpa ara 
is at the point 330, and if axle 70 is then similtaneously un- 
clamped, the center of axle 60 will be forced 
to move along the arcuate line of action 340 centered on the 
point 330, the center of axle 70 will be forced to move along 
the line 74 (as.determined by a suitable guidance slot or other 
Means, for example), and the center of axle 90 will be forced to 
move along the arcuate line of action 94 between the two turn- 
ing points 92 and 95,where the center of the arc 94 is the point 
121. The desired result of the switching operation when axle 60 
has its center at point 64 is that the piston velocity oscilla- 
tion is then suddenly shifted by 180° in phase, again witnout 
producing any significant impulsive loads on any of the machin- 
ery of the projector. This last-mentioned switching operation 
can, of course, be reversed whenever the center of axle 60 is at 
the turning point 64. 
Further, suppose that axle 90 has been clamped with its center at 
93, and suppose that axle 90 is suddenly released while axle 70 
is clamped when the center of axle 60 is at 653; then the center of 
axle 60 will be forced to move along line 63 to the turning point 
64. If, now, axle 70 is released and axle 90 is clamped when its 
center is at the point 92 and the center of axle 60 is at the point 
64, then the subsequent mction of axle 60's center will be along 
the arcuate line of action 68 centered at point 92, and the center 
Of axle 70 will be forced to move along the line 74. The effect of 
these successive switching operations will then be readily seen to 
be to cause the pistons to engage in an odd number of half-oscilla- 
tions. This result is often desirable, especially when the odd 
number of half-oscillations is chosen to be the number 1. 
Clearly, by moving the transport mechanisms carrying axles 70 and 
310 so as to bring those axles nearer to axle 90, the amplitudes 
of the above-described motions can be reduced individually to any 
desired degree, even to zero. 
5. All the above-described systems can be combined to yield a 
Single system capable of performing any of the described operations 
on command. 
6. In summary, the NRAP projector of ref. (a) when modified ac- 
cording to this disclosure has the following capabilities: 
(1) The rotor turning frequency, and hence all projector 
motions dependent on that frequency, can be quickly 
or slowly modulated (varied) independently of operating 
depth or amplitude(s) of the system. 
(2) The amplitude(s) of operation of the system can be 
quickly or slowly modulated (varied) independently of the 
operating depth or frequency of the system. 
49 Ee 
ER Re A eo Baa i te ea Sa SEVEN ect PAE I 
SASSAFRAS ESSA TIT N SD TES LETS TS OSSD a StF 
