714 TIMBER AND TIMBER TREES.  [cuav. 
added thereto; to be fairly sided from end to end, 
parallel, and to be measured for contents as far as it 
holds, at the top end, on each side, between the wanes, 
three-fourths of the siding of the piece. The pane* at 
the top is to determine the length of the piece; but if 
the length of the sides be not equal, the mean is to be 
taken. The timber to be so hewn upon the moulding 
edges that the surface of the square shall not be less 
than one-fourth the diameter of the piece. The timber 
to be measured for contents at the middle of the length, 
FIG. 18, 
FIG. 19. 
when fairly grown from end to end, but if otherwise, it 
will be regulated by the stops or joggles. Such timber 
as has length beyond the prescribed proportion of pane, 
being compass timber, and the additional length aiding 
the conversion, or such as shall be ond fide convertible 
for a beam piece, to be received at the discretion of 
the officers, who are to determine the length ; two-thirds 
of the additional length to be measured for the cubic 
contents. 
* Pane is the hewn or sawn surface of the log, P Fig. 160, 
