92 TIMBER AND TIMBER TREES.  [cnap. 
mercial values of the two bracks vary both in the 
timber, and in the plank, in about the proportion of 
three to two. 
In civil architecture, the Dantzic Oak may be used 
with advantage for a great variety of purposes, as it 
stands well, shrinks only moderately, and without split- 
ting much in seasoning. 
The Navy contracts for Dantzic Oak do not include 
square timber, but thick-stuff of 7 to 4% inches, and 
plank of 4 to 2 inches only, which are received under 
the following specification :— 
The Dantzic Oak thick-stuff and plank to meet at 32 feet, and none to 
be shorter than 24 feet; and to be from 10 to 13 inches broad, averaging 
11 inches clear of sap. The whole to be fresh, clean, free from defective 
wanes, cut regular, square-edged, and straight; the breadth for measure- 
ment to be taken clear of sap at the middle of the length; 67 per cent. of 
each thickness to be of first or crown quality, and the remainder of second 
or crown brack quality. 
Tables XXXII. and XXXIII. show that the Dantzic 
Oak,when tested transversely, or tensilely, is of moderate 
strength ; and, according to Table XX XIV., when tested 
for the vertical or crushing strain, it proves to be strong, 
and compares favourably with the British Oak. 
