1918.] The N.Z. Journal of Science and Technology 305 
Time— Minutes. 
Fig. 7.—Diagram showing changes in interior temperature under treat 
ment with creosote at 187° and 212° F. Atmospheric pressure. 
Curve A, average for unseasoned wood at 212°; I, seasoned wood 
at same temperature ; II, unseasoned wood at 187° F. 
Table XL.—Some Temperature Data on Individual Pieces under Treatment 
with Creosote at Atmospheric Pressure. 
No. of Piece. 
Temperature of 
Cylinder. 
Initial 
Temperature. 
Temperature of 
End Point. 
Time to End 
Point. 
Deg. F. 
Deg. F. 
Deg. F. 
Min. 
1 
212 
64 
173 
99 
2 
211 
64 
172 
102 
3 
212 
60 
179 
100 
4 
213 
67 
172 
98 
7 
212 
65 
180 
116 
10 
187 
58 
142 
107 
13 
188 
61 
139 
110 
16 
185 
67 
145 
108 
17 
187 
64 
146 
no 
19 
187 
68 
150 
105 
20 
183 
63 
160 
109 
EFFECT OF TREATMENT ON STRENGTH. 
Test pieces were cut approximately 12 in. by f in. by § in., and were 
tested for rupture strain at right angles to the grain, strain being applied at 
the centre of the piece, which was supported at each end. Pieces were 
impregnated, and controls were cut from the same stick and tested without 
treatment, care being taken to keep the number of rings per inch the same 
in both control and test piece. The tests were conducted in the Otago 
University School of Mines, under the guidance of Professor J. Park, results 
being calculated according to the formula— 
D 2 x B 
where W = weight in pounds, L = length in feet, B and D == breadth and 
depth in inches, N = constant for the given timber. 
In all cases the wood was treated to refusal with the preservative, and 
was tested when the moisture-content had been lowered to the original 
figure before treatment. 
20—Science. 
