PART III. LOG AND WOOD MEASUREMENT 



SECTION I 

 CUBIC CONTENTS 



THE simplest way to measure the contents of a log is to 

 take its length and mid-diameter and ascertain the cubic 

 contents of a cylinder having those dimensions. Bark may 

 be taken in or left out. By the use of a caliper and tape, 

 a very close result may be had on logs that are not too 

 long, provided care is taken either by inspection or by cross 

 measurement to get a true mid-diameter. Trees cut nearly 

 full length are given as a rule too large a value when 

 measured in this way, larger, that is to say, than their 

 actual cubic contents. The percentage of overrun for large 

 spruce cut off at 5 to 8 inches diameter in the top is about 



6 per cent of their true volume. 



When logs are placed in a pile the best that can be done 

 is to use a diameter which is an average between the diam- 

 eters of the ends, swell at the stump, if present, being 

 disregarded. 



First among the tables for log measurement given in the 

 back of this work is a table of cylinders with contents 

 in cubic feet, standard measure. The lengths in feet are 

 given in the first vertical column, the diameters in inches 

 on the upper horizontal line, and the contents of any log is 

 read off opposite its length and beneath its diameter. If 

 the length is not given, add together such lengths as will 

 make it up. Thus a log 12 inches in diameter and 47 feet 

 long has the contents of a log 40 feet long + that of a log 



7 feet long, or 31 + 5.5 cu. ft. = 36.5 cu. ft. 



For practical purposes results near enough will be had 

 if fractions of inches more than J inch are taken as of the 

 inch above, and fractions of 4 inch and less are disregarded. 



