HABIT FORMATION IX THE DOO 



39 





Figure 3a Figure 3b 



F, standard fork; R, Konig resonator; C, clamp; S, set screw; P, pillar support- 

 ing R; A, B, screw contacts; M, magnet, supported by nut, N, sliding 

 through groove G in back wall. 



A'aried widely by varying the distance between the resonator 

 and fork. A vernier scale may be placed on the sleeve and the 



