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Figure 4 shows the completed NP.AP in an oversize housing with walls chosen to be 
much thicker than necessary. The rotor drive motor is a dc motor rated at 1/12th hurse- 
power. !t drives the fly wheel, housed in a flat cylindrical enclosure, by means of a V-belt 
and pulleys. The projector has two opposed pistons. 
Figure 5 shows the underside of the horizontal plete seen at the middle of figure 4. 
One piston push rod with its piston face removed is seen passing through its linear bearing #t 
the left. In the center of figure 5 is the rotor partiall:’ bidden under the eccentric drive pin 
labeled B in figure 3. In the foreground of pin B is the pin labeled C in figure 3, and to the 
right of pin C is the pin labeled F in figure 3. Prominent at the right of figure 5 is the amp- 
litude adjustment motor and its associated screw drive assembly for moving pin F. Below 
and between the screw drive assembly and pin B can be seen part of the rocking cross arm. 
The linear transducer provides a precise electrical indication of the location of pin F and 
hence of the amplitude of piston motion. 
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