540 



Table IV. Results vlth frame style shown in Figure 11. 

 Charge-to-gauge distance 48 in. 



a/ Corrected to 0.085-i.n. thickness. The correction of damage re- 

 sults to compensate for variations in diaphragm thickness is discussed in 

 Part V, Sec. 5(a) 



b/ Wood used was hemlock, all others were pine. 



c/ Compared with 2 x 3/4- in. stock. 



d/ Braced with broken manbers. 



