CHAP. XII.] 



OAK SPECIFICATIONS. 



119 



the conditions bping that the measurement of rough 

 timber for payment is to be regulated by the stops or 

 joggles. Every piece to be measured for contents by 

 calliper measurementj as far as the spire will hold 

 12 inches in diameter. No tops to be received, except 

 the spire and such other top or limb as may be grown 

 on the main piece, of a substance and length to admit 

 of being converted with it. Such other top or limb 



FIG. i6a. 



FIG. 16b. 



will be measured for contents as far as it will hold 

 12 inches in diameter. If, however, the professional 

 officers of the yards are of opinion that the conversion 

 of the main piece will be improved thereby, tops, 

 including the spire, will be measured for contents as 

 far as they will hold 9 inches in diameter ; butj in such 

 case, two-thirds only of the contents below 12 inches 

 in diameter will be added to the other contents of the 

 piece for payment. All the rough timber to be so 

 hewn or squared that no part of the surface or square 



