92 TIMBER AND TIMBER TREES. [CHAP. 



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 

 1 1 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 XXXIV., when tested 

 for the vertical or crushing strain, it proves to be strong, 

 and compares favourably with the British Oak. 



