Table 1.- - Exposure cycles of yellow birch plywood bonded with 
vegetable glue 
: Fir; 
3t stage 
: Sec< 
2nd stage 
Test 
: Type of 
: exposure cycle 
: Time 
: Relative 
: Time 
■ Relative 
: humidity 
humidity 
■ Days 
: Percent 
Days 
Percent 
1 
• Continuous (controls) 
• • • • • 
30 
• • ♦ • 
• •••••• 
2 . 
Alternating 
Ik 
60 
Ik 
30 
3 : 
Ik 
80 
Ik 
30 
k ': 
Ik 
90 
Ik 
30 
5 : 
Ik 
97 
Ik 
30 
6 : 
2 : 
(1) 1 
12 
30 
toi 
©: 
00. 
to -"" 
1 
ORIDA 
III 
3553 
a^^^H 
"= 
— q 
oaked in water at room temperature, 
Report No. R30 
